EP1973954A2

EP1973954A2 - Methods, articles and systems for delivering superabsorbent polymers in agricultural settings

Info

Publication number: EP1973954A2
Application number: EP07716719A
Authority: EP
Inventors: Milan H. Savich; John D. Graham
Original assignee: Absorbent Technologies Inc
Current assignee: Absorbent Technologies Inc
Priority date: 2006-01-17
Filing date: 2007-01-17
Publication date: 2008-10-01
Also published as: WO2007084550A2; EP1973954A4; BRPI0706548A2; WO2007084550A3

Abstract

Methods, articles, systems and compositions for delivering and administering superabsorbent polymer ('SAP') products in agricultural applications is disclosed. In one embodiment, the delivery system comprises a horticulture mat that may include two cellulose substrate sheets bonded together with SAP particles disposed between the sheets. In another embodiment, a delivery article comprises a porous, biodegradable packet containing SAP particles. In yet another embodiment, a delivery article is described dispensing a SAP hydrogel. In a further embodiment, root dip composition and methods of delivery a SAP hydrogel to a plant are described.

Description

METHODS, ARTICLES AND SYSTEMS FOR DELIVERING SUPERABSORBENT POLYMERS IN AGRICULTURAL SETTINGS

Technical Field

[00011 The present disclosure relates to superabsorbent polymer products and to methods, articles and compositions for applying and delivering superabsorbent polymer products in horticultural and agricultural applications.

Brief Description of the Drawings

[0002] The embodiments disclosed will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only typical embodiments and are, therefore, not to be considered limiting of the scope of the appended claims, the embodiments will be described with additional specificity and detail through use of the accompanying drawings in which:

[0003] Figure 1 is a partially cut-away perspective view of one embodiment of a horticulture mat containing superabsorbent polymer products. [0004] Figure 2 is a partially cut-away side cross-sectional view of one embodiment of a horticulture mat containing superabsorbent polymer products. [0005] Figure 3 is a perspective view of one embodiment of a horticulture mat being unrolled for application.

[0006] Figure 4 is a partially cut-away perspective view of one embodiment of an agricultural supplement packet containing superabsorbent polymer particles. [0007] Figure 5 is a side elevation view of one embodiment of an agricultural supplement packet containing superabsorbent polymer particles planted adjacent the root system of a plant.

[0008] Figure 6 is a perspective view of a root system of a plant before being dipped into a superabsorbent polymer hydrogel.

[0009] Figure 7 is a perspective view of one embodiment of a superabsorbent polymer applicator dispensing a superabsorbent polymer hydrogel. [0010] Figure 8 is a side elevation view of one embodiment of a superabsorbent polymer applicator dispensing a superabsorbent polymer hydrogel adjacent the root system of a plant. Detailed Description

[0011] Those skilled in the art will recognize that the methods, components and compositions disclosed herein may be arranged and practiced in a wide variety of different configurations, such as without one or more of the specific details described, or with other methods, components, materials, etc. In some cases, well- known materials, components or method steps are not shown or described in detail. Furthermore, the described components, method steps, compositions, etc., may be combined in any suitable manner in one or more embodiments. [0012] Thus, the following more detailed description of various embodiments, as represented in the Figures, is not intended to limit the scope of the present disclosure, but is merely representative of certain exemplary embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0013] Superabsorbent polymers ("SAPs") are materials that imbibe or absorb at least 10 times their own weight in aqueous fluid and that retain the imbibed or absorbed aqueous fluid under moderate pressure. The imbibed or absorbed aqueous fluid is taken into the molecular structure of the SAP rather then being contained in pores from which the fluid could be eliminated by squeezing. Some SAPs can absorb up to, or more than, 1 ,000 times their weight in aqueous fluid. [0014] SAPs may be used in agricultural or horticultural applications. The terms "agricultural" and "horticultural" are used synonymously and interchangeably throughout the present disclosure. Applying SAPs to soil or other plant-growing media in agricultural settings have resulted in earlier seed germination and/or blooming, decreased irrigation requirements, increased propagation, increased crop growth and production, decreased soil crusting, increased root development, stronger/heartier plants, plants less susceptible to disease, increased yield and decreased time of emergence.

[0015] Synthetic SAPs are commercially available and are conventionally used in conjunction with baby or adult diapers, catamenials, hospital bed pads, cable coating and the like. However synthetic SAPs may also be used in agricultural applications. Another type of SAP product used more widely in agricultural applications include starch graft copolymers. Starch graft copolymers comprise a monomer graft polymerized onto a polysaccharide, such as a starch or cellulose. Starch graft copolymers may be used to absorb aqueous fluids for use in absorbent softgoods, in increasing the water holding capacity of soils, and as coatings onto seeds, fibers, clays, and the like.

[0016] One method of producing a starch graft copolymer SAP for use in agricultural applications involves graft polymerizing acrylonitrile onto a starch in the presence of an initiator, such as a eerie (+4) salt, to form the starch graft copolymer, and saponifying the nitrile groups with an alkali metal to form a saponificate having alkali carboxylate and carboxamide groups.

[0017] Another method comprises (1) graft polymerizing a monomer, other than acrylonitrile, onto a starch in the presence of an initiator to form a starch graft copolymer; (2) cross-linking the starch graft copolymer, for example, by adding a cross-linking agent to cross-link the starch graft copolymer; (3) adjusting the pH of the cross-linked starch graft copolymer, e.g., neutralization; (4) isolating the cross- linked starch graft copolymer; and (5) drying the cross-linked starch graft copolymer. [0018] Exemplary polysaccharides include cellulose, starches, flours, and meals. Exemplary starches include native starches (e.g., com starch (Pure Food Powder, manufactured by A.E. Staley), waxy maize starch (Waxy 7350, manufactured by A.E. Staley), wheat starch (Midsol 50, manufactured by Midwest Grain Products), potato starch (Avebe, manufactured by A.E. Staley)), dextrin starches (e.g., Stadex 9, manufactured by A.E. Staley), dextran starches (e.g., Grade 2P, manufactured by Pharmachem Corp.), corn meal, peeled yucca root, unpeeled yucca root, oat flour, banana flour, and tapioca flour. The starch may be gelatinized to provide optimal absorbency. An exemplary starch is gelatinized cornstarch. Furthermore, according to one embodiment, the weight ratio of the starch to the monomer is in the range of between about 1:1 and about 1:6. [0019] Exemplary initiators for graft polymerizing a monomer onto a starch include cerium (+4) salts, such as eerie ammonium nitrate; ammonium persulfate; sodium persulfate; potassium persulfate; ferrous peroxide; ferrous ammonium sulfate-hydrogen peroxide; L-ascorbic acid," and potassium permanganate-ascorbic acid. Other suitable initiators known to those skilled in the art may be used, such as alternative persulfates and peroxides, as well as vanadium, manganese, etc. The amount of initiator used may vary based on the chosen initiator, the selected monomer, and the chosen starch. Some initiators, e.g., persulfates, may require the presence of heat. The initiator may be added in a single or multiple steps, and multiple initiators may be used.

[0020] Exemplary cross-linking agents include: glycerides; diepoxides; diglycidyls; cyclohexadiamide; methylene bis-acrylamide; bis-hydroxyalkylamides, such as bis-hydroxypropyl adipamide; formaldehydes, such as urea-formaldehyde and melamine-formaldehyde resins; isocyanates including di- or tri-isocyanates; epoxy resins, typically in the presence of a base catalyst; and derivatives and mixtures thereof

[0021J According to the first exemplary method where acrylonitrile is graft polymerized onto a starch, the resulting starch graft copolymer may be saponified with an alkali metal, such as potassium hydroxide or sodium hydroxide, to convert the nitrile groups into a mixture of carboxamides and alkali carboxylates. The starch graft copolymer may then be precipitated.

[0022] In one embodiment, precipitation occurs via an acid titration. Acid, such as hydrochloric acid, nitric acid, sulfuric acid, or phosphoric acid may be added until a pH of between about 2.0 and about 3.5, more particularly about 3.0, is reached. The resulting precipitate may be washed with water to remove the salts, and if necessary, separated in some manner. Separating methods include settling, centrifuging, and other mechanical means of separating.

[0023] The carboxylic acid of the starch graft copolymer may then be titrated back to the alkali form with the hydroxide of an alkali metal, such as potassium hydroxide, to a pH of between about 6.0 and about 8.0, more particularly about 7.0. This viscous mass may then forced through a die plate, dusted to remove tackiness, and air or oven dried. The dried particles are then screened to the appropriate size. If desired, the particles could be ground to fine particles then formed into pellets of the desired size for use in agriculture.

[0024] In another embodiment, the isolated product is recovered from the viscous saponificate with the use of water miscible solvents such as alcohols. These include, for example, methanol, ethanol, propanol and isopropanol. The resulting dough is immersed into the alcohol, and the alkali starch graft copolymer is precipitated into particles that are optionally screened after drying to the desired size. [0025] Formation of the starch-containing graft copolymers into particles of the desired size for direct use in agricultural equipment may be achieved by converting the viscous mass of alkali starch-graft copolymers into, for example, rod-shaped forms and drying the forms to the desired particle size. Selecting an appropriate die can vary the rod-shaped forms. A plate may be used that has been drilled or formed to contain holes of a particular size and shape. For example, the diameter of the rods may be controlled by the diameter of the holes drilled in the end plate. In one embodiment, the holes in the end plate may range from between about 1/16 inch to about 1/4 inch in diameter. Rod-shaped forms may be lightly coated, after the die, to reduce their tackiness. Clays, starches, flours and cellulose may be used to dust the rods. In another embodiment, the starch graft copolymer may be isolated through the use of an extruder, such as through a heated screw.

[0026] According to another method of producing a SAP product, alternative monomers other than acrylonitrile are graft polymerized onto a starch in the presence of an initiator to form a starch graft copolymer. Exemplary alternative monomers include acrylic acid or methacrylic acid. Exemplary monomers may also include acrylamide or methacrylamide. Sulfonic acids, such as 2-acrylamido-2- methyl-propanesulfonic acid (AMPS) and vinyl sulfonic acid may also be used. Moreover, acrylates, such as ethyl aery late and potassium aery late may also be used. Derivatives and mixtures of the above-listed monomers may also be desirable.

[0027] In applications using acrylic acid, the addition of acrylamide thereto helps induce graft polymerization and adds to absorbency of the SAP. By way of example, the ratio by weight of acrylic acid to acrylamide may be about 2:1. Alternatively, the ratio of acrylic acid to acrylamide may also range up to a ratio of 9:1 and beyond. Because acrylamide is considered a neurotoxin, it may be desirable to reduce the relative amount of acrylamide to acrylic acid, while using enough to help induce graft polymerization of acrylic acid.

[0028] In alternative applications, acrylic acid may graft polymerize onto a starch or other polysaccharide without the assistance of acrylamide. For example, acrylic acid may polymerize when placed under heat and/or pressure. Polymerization without the addition of acrylamide may be accomplished, for example, in a heated screw extruder, such as a single screw or a double screw. [0029] As described above, the monomer is graft polymerized onto a polysaccharide in the presence of an initiator to form a starch graft copolymer. Exemplary starches and initiators have been described above. The starch graft copolymer may then be cross-linked, for example, by adding a chemical cross-linking agent to form a cross-linked starch graft copolymer. It may be desirable for the starch graft copolymer to be cross-linked if it dissolves in aqueous fluids previous to being cross-linked. Cross-linking is one method to permit the starch graft copolymer to absorb aqueous fluids without dissolving. However, the amount of cross-linking agent added is typically indirectly proportional to the absorbency of the resulting SAP product. Exemplary cross-linking agents have also been described above. [0030] Alternative methods of cross-linking may also be employed. For example, a solid SAP product may be cross-linked through irradiation, such as through exposure to gamma or x-ray electromagnetic radiation, or to an electron beam and the like. Irradiation facilitates cross-linking of the starch graft copolymer by creating free radicals in the copolymer chain. In some applications, after irradiation an annealing or melting process may be used to re-form the cross-linked copolymer chains. Furthermore, it may be desirable to perform the irradiation process in an atmosphere relatively free of oxygen.

[0031] Although the addition of cross-linking agents may be desirable in the production of SAPs, self-cross-linking copolymers may also be used. In a self-cross- linking copolymer, either a single self-reactive functional group or multiple self- reactive functional groups or multiple co-reactive functional groups are incorporated into the mixture. One exemplary co-reactive functional group is a copolymer of acrylic acid and glycidyl methacrylate.

[0032] The pH of the cross-linked starch graft copolymer may be adjusted to a desired value for the particular agricultural application. For example, the cross- linked starch graft copolymer may be neutralized to convert the carboxyl groups to potassium salts. Alternative pH values may be desirable depending upon the type of soil and the type of crop the resulting SAPs will be applied to. The resulting pH for most agricultural applications typically will range from about 6.0 to about 8.0. The desired pH may be greater or less than this range depending on the requirements for the particular agricultural application.

[0033] Alternatively, in some embodiments, pH adjustment of the starch graft copolymer may occur prior to cross-linking. Exemplary solvents that may be used to effect pH adjustment include potassium hydroxide, potassium methoxide, or a mixture thereof, any of which may optionally be diluted in methanol or other solvents. [0034] In alternative embodiments, pH adjustment may not be necessary. For instance, if potassium acrylate were used as the monomer in lieu of acrylic acid, the resulting product may already be within an acceptable pH range. [00351 The resulting pH-adjusted, cross-linked starch graft copolymer may then be isolated. One exemplary method of isolation involves simply drying the cross-linked starch graft copolymer, such as, for example, on a heated drum or via air-drying. The dried SAP product may then be pelletized according to pelletization methods known to those having skill in the art. According to this embodiment, isolation of the SAP product may be achieved in an alcohol-free environment. [0036] In another embodiment, the step of isolating the starch graft copolymer involves extruding the cross-linked starch graft copolymer such as through a heated screw to form granules of SAP product. To minimize re-agglomeration of the granules, the granules may be coated with a dusting agent that decreases their propensity to stick together. Exemplary dusting agents include cellulose, clay, starch, flour, and other natural or synthetic polymers that prevent the granules from sticking together. Alternatively, the granules may be lightly sprayed with methanol, to prevent them from sticking together, and/or the extrusion can be_. performed under high pressure.

[0037] Yet another exemplary method of isolating the starch graft copolymer involves precipitating the pH-adjusted, cross-linked starch graft copolymer using water-miscible solvents such as alcohols, e.g., methanol, ethanol, propanol, and isopropanol. Immersing the cross-linked starch graft copolymer in alcohol may cause the alkali starch graft copolymer to precipitate into particles that are later screened to the desired size after drying. The alcohol removes the water and extraneous salts from the cross-linked starch graft copolymer. [0038] Another exemplary implementation of this method of precipitation involves blending sufficient methanol into the pH-adjusted, cross-linked starch graft copolymer to achieve a smooth dispersion. The smooth dispersion may then be pumped into a precipitation tank, which may include a stirring system that can vigorously mix the methanol while pumping in the smooth cross-linked starch graft copolymer dispersion. Once mixed, the resulting methanol and cross-linked starch graft copolymer particles may be collected by decanting or washing with methanol or centrifuged and collected, then dried to a moisture level of between about 1 percent and about 20 percent.

[00391 Another implementation of the isolation step through precipitation with methanol involves wetting the surface of the cross-linked starch graft copolymer with a small amount of methanol and then chopping the cross-linked starch graft copolymer into larger "chunks" that will not re-adhere to one another. Once the surface of the starch graft copolymer has been wetted with methanol, the resulting material is slippery to the touch and is no longer sticky. This effect may be achieved by using a compositional ratio of between about one part and about two parts of methanol per one part of solid.

[0040] Once the methanol has been added, the cross-linked starch graft copolymer may be pumped through an in-line chopper to form chunks having a diameter of less than one inch or, alternatively, hand-chopped with scissors. In one embodiment, the resulting mixture is then fed into a tank or Waring blender that has between about 1.5 gallons and about 4.0 gallons of additional methanol per pound of cross-linked starch graft copolymer. In some embodiments, the cross-linked starch igraft copolymer may be subject to a pulverizer, in the presence of methanol, such as an in-line mixer or disintegrator which breaks the mass into smaller pieces as desired for the particular application. The methanol in the larger tank may be agitated with a Cowles dissolver or other mixer capable of achieving high speeds. [0041] Yet another implementation of the isolation step through precipitation with methanol involves pre-forming the particle size before the methanol precipitation step. The use of dies to form strands or rods having different shapes and diameters can improve the particle size formation process. This particular implementation offers enhanced control of the final particle size. The cross-linked starch graft copolymer (neutralized or unneutralized) may be forced through a die plate having holes of varying diameter (e.g., about 1/16 inch to more than 1/4 inch) and varying shapes (e.g., round, star, ribbon, etc.).

[0042] Methods of forcing the cross-linked starch graft copolymer through the die plate include using a hand-operated plunger, screw-feeding, auguring, pumping, and any other commonly known method. The resulting strands or rods may be placed into the precipitation tank without any further addition of methanol as a premixing agent. The strands or rods may be treated to prevent them from sticking together by, for example, wetting or spraying the strands or rods with methanol or dusting them with a dusting agent, such as, for example, cellulose, clay, starch, flour, or other natural or synthetic polymers. The resulting strands or rods may be precipitated with agitated methanol, removed from the tank, and dried. [0043] Alternatively, the cross-linked starch graft copolymer product may be mixed with a solvent, such as water, to form a slurry or gel.

[0044] Depending on the agricultural application, the final SAP product may have a particle size that is courser than about 300 mesh. For example, in some applications where the starch graft copolymer is applied directly into the soil with the crop, the particle size is courser than about 50 mesh, such as between about 8 to about 25 mesh. This particle size range correlates to commercially available granule applicators. Therefore, alternative particle sizes may be used. [0045] Finer particle sizes are typically used in seed coating or root dipping applications. By way of example, the particle size for seed coating may be between about 75 and about 300 mesh, such as about 100 mesh. For root coating, the particle size may be between about 30 mesh and about 100 mesh, such as about 50 mesh. Depending on the application, the SAP particles may be in powder form, however granular, flake, pelletized or rod-shaped SAP products may also be used. Any size or form of SAP particle may be used suitable for each particular application as would be apparent to those having skill in the art with the aid of the present disclosure.

[0046] Figure 1 represents one embodiment of a method of delivering a SAP in an agricultural setting comprising a biodegradable horticulture mat 100, as shown from a partially cut-away perspective view. The mat 100 may comprise a first sheet 102 that is bonded to a second sheet 104 through adhesives. Alternatively an aqueous based compression system may also be used. In one embodiment, the first and second sheets 102, 104 are biodegradable cellulose substrates. In an alternative embodiment, SAP particles may be introduced into peat pots, peat pellets, peat trays and compressed peat containers.

[0047] As shown in Figure 1, cellulose sheets 102, 104 may be available from

Buckeye Technologies, Inc., Georgia-Pacific Corp., or Koch Industries, Inc. However, alternative substrates may also be used such as synthetic or biodegradable nettings, peat papers, woven and other sheet materials. [0048] SAP particles 106, such as the synthetic and starch graft copolymers disclosed herein, are disposed between the first and second cellulose sheets 102, 104. Additional media may also be introduced between the cellulose sheets 102, 104 along with the SAP particles 106. For example, seeds 108 and/or additional additives 110, such as fertilizers may also be disposed between the sheets 102, 104. Alternative or additional additives 110 that may be part of the horticulture mat 100 include pesticides, herbicides, fungicides, growth hormones and regulators, mycorrhizal fungi, kelp products, soil-based nutrients and the like. [0049] The seed 108 that is optionally included in the horticulture mat 100 may be grass seed. Alternatively, crop seed may be included within the mat 100 such as commodity crops like corn or high-value crops such as tomato, celery and the like. Any suitable seed may be used as would be apparent to those having skill in the art. Furthermore, various fertilizers that are commercially available may be included as would be apparent to those having skill in the art. In some embodiments, controlled- release fertilizers may be included.

[0050] Exemplary pesticides that may be included in the horticulture mat 100 include, but are not limited to, acaricides, algicides, antifeedants, avicides, bactericides, bird repellents, chemosterilants, herbicide safeners, insect attractants, insect repellents, insecticides, mammal repellents, mating disruptors, molluscicides, nematicides, plant activators, plant-growth regulators, rodenticides, synergists, and virucides. Exemplary microbial pesticides include bacillus thuringiensis and mycorrhizal fungi. Exemplary insecticides include, but are not limited to, thiodan, diazinon, and malathion.

[0051] Exemplary commercially available pesticides include, but are not limited to: Admire™ (imidacloprid) manufactured by Bayer, Regent™ (fipronil) manufactured by BASF, Dursban™ (chlorpyrifos) manufactured by Dow, Cruiser™ (thiamethoxam) manufactured by Syngenta, Karate™ (lambda-cyhalothrin) manufactured by Syngenta, and Decis™ (deltamethrin) manufactured by Bayer. A combination or blend of pesticides may also be used. Alternative pesticides may also be used as would be apparent to those having skill in the art with the aid of the present disclosure. [0052] Fungicides may also be included in the matrix of the horticulture mat

100. Fungicides may help control or prevent the growth of mold or fungus on the roots, seeds or seedlings thus inhibiting root or seed rot. Exemplary commercially available fungicides include, but are not limited to: Amistar™ (azoxystrobin) manufactured by Syngenta, Folicur™ (tebuconazole) manufactured by Bayer, Opus™ (epoxiconazole) manufactured by BASF, Dithane™ (mancozeb) manufactured by Dow, Flint™ (trifloxystrobin) manufactured by Bayer, and Ridomil™ (metalaxyl) manufactured by Syngenta. A combination or blend of fungicides may also be used. Alternative fungicides may also be used as would be apparent to those having skill in the art with the aid of the present disclosure. [0053] Regarding pesticides and fungicides, starch-based polymer SAP encapsulated pesticides or fungicides may imbibe water and swell such that the pesticide particles diffuse out of the starch matrix into the soil surrounding a plant, root, seed, or seedling in a controlled manner. Two exemplary goals of controlled- release pesticides or fungicides are (1) to increase efficacy of the pesticide/fungicide and (2) to reduce negative environmental consequences of pesticide/fungicide application.

[0054] Exemplary commercially available herbicides that may be included within the matrix of the horticulture mat 100 include, but are not limited to: Roundup™ (glyphosate) manufactured by Monsanto, Gramoxone™ (paraquat) manufactured by Syngenta, Harness™ (acetochlor) manufactured by Monsanto, Prowl™ (peπdimethalin) manufactured by BASF, Dual™ (metolachlor) manufactured by Syngenta, and Puma™ (fenoxaprop) manufactured by Bayer. Furthermore, a combination or blend of herbicides may be used. Alternative herbicides may also be used as would be apparent to those having skill in the art with the aid of the present disclosure.

[0055] Exemplary commercially available plant-growth regulators that may be optionally included in the matrix of the horticulture mat 100 include, but are not limited to: Ethrel™ (ethephon) manufactured by Bayer, Pix™ (mepiquat) manufactured by BASF, Dropp™ (thidiazuron) manufactured by Bayer, Finish™ (cyclanilide) manufactured by Bayer, and Royal MH™ (maleic hydrazide) manufactured by Crompton. A combination or blend of growth regulators may be used. Furthermore, growth inhibitors, growth retardants, growth stimulants, and derivatives and mixtures thereof may be included. Alternative growth regulators or hormones may also be used as would be apparent to those having skill in the art with the aid of the present disclosure,

[0056] Exemplary soil-based nutrients that may be optionally included in the. matrix of the horticulture mat 100 include calcium, magnesium, potassium, phosphorus, boron, zinc, manganese, copper, iron, sulfur, nitrogen, molybdenum, silicon, ammonium phosphate, fish meal, organic compounds and additives, organic based fertilizers derived from plant and animal products, and derivatives, blends, and mixtures thereof. More information about exemplary growth-promoting additives can be found in The Farm Chemicals Handbook published by Meister Publishing Company.

[0057] The SAP particles 106 within the horticulture mat 100 promote growth of the seeds 108 contained in the matrix or the seed or plant life adjacent to where the mat 100 is applied. Plant growth is facilitated by promoting the availability of beneficial nutrients to the plant, root, seed, or seedling. The high absorptivity of the SAP particles 106 facilitates entrapment of the fertilizers 110, growth-promoting additives and other additives heretofore described, thereby minimizing or eliminating ■disassociation or release of the additive 110 from the SAP matrix due to heavy rainfall, watering, etc. Because some amount of the additive 110 will become entrapped in the matrix of the SAP product 106, the runoff rate of additives 110 is significantly less than the runoff rate of additives applied directly to soil, plants, roots, seedlings, or seeds.

[0058] Additionally, the SAP particles 106 facilitate a more efficient uptake of nutrients and water to the plant, root, seed, or seedling. Increasing the availability of nutrients and/or water may affect an increase in crop yield, growth rate, seed germination, and/or plant size, and may affect earlier seed germination and/or blooming, decreased irrigation requirements, increased propagation, increased crop growth, increased crop production, decreased soil crusting, increased root development, stronger/heartier plants, and plants less susceptible to disease. [0059] Figure 2 represents an embodiment of a horticulture mat 200 containing SAP particles 206, as shown from a partially cut-away side cross- sectional view. As described above, the mat 200 comprises a first sheet 202 that is bonded to a second sheet 204, with the SAP particles 206 disposed there between. This particular embodiment of the horticulture mat 200 has a thickness of less than 2 millimeters. The thin and lightweight nature of the horticulture mat 200 allows a user to single-handedly carry an amount of the mat 200 that may be sufficient to cover a significant portion of a yard, such as when using the mat 200 to establish and promote germination of grass seed.

[0060] Figure 3 represents one embodiment of a rolled horticulture mat 300 as shown from a perspective view. The horticulture mat 300 may be rolled for storage and transportation and subsequently unrolled for a particular agricultural application. According to one embodiment, the density of the horticulture mat 300 is such that an individual can single-handedly carry a roll of the mat 300 which may be applied across a significant area.

[0061] The horticulture mat 300 may be applied directly on or under soil to facilitate the growth of plant life (e.g., grass, crops, ground cover, etc.). The horticulture mat 300 may also be placed in a furrow to facilitate growth of seed planted therein, or alternatively to facilitate the growth of seed contained within the matrix of the horticulture mat 300. Furthermore, a section of the horticulture mat 300 may be placed or lined within a pot or hole before planting or transplanting a flower, -shrub, etc.

[0062] Following application of the horticulture mat 300, a fluid may be applied at the location of the mat 300, such as water from sprinklers, rain, etc. or liquid fertilizer or other desirable chemicals and additives as would be apparent to those having skill in the art. The fluid is then imbibed or absorbed by the SAP particles contained within the mat 300.

[0063] Figure 4 represents one embodiment of an agricultural supplement packet 400, as shown from a partially cut-away perspective view. For purposes of this application, the term "packet" refers to any form of receptacle for containing material such as a bag, envelope, carton, container, etc. The packet 400 may be constructed of a biodegradable material 401, such as cellulose, that degrades and/or dissolves over time when planted in an agricultural setting. According to one embodiment, the supplement packet 400 may be constructed of material 401 that is similar to a conventional tea-bag. Other biodegradable materials may be used as would be apparent to those having skill in the art. Exemplary commercially available bags 400 may be available from manufacturers, such as Reforestation Technologies, Inc.

[0064] The packet 400 may be comprised of a single sheet of biodegradable material 401 that is sealed on all sides. Alternatively, the packet 400 may form a receptacle through a series of folds. Adhesives, fasteners, ties and the like may also be used to encapsulate a supplement matrix 402 within the packet 400 as would be apparent to one having skill in the art. In one embodiment the biodegradable material 401 of the packet 400 is porous, allowing fluid to diffuse through the walls of the packet 400.

[0065] The matrix 402 contained within the biodegradable packet 400 includes

SAP particles 404, such as the synthetic and starch graft copolymers disclosed herein. The SAP particles 404 may be any size or form as would be apparent to those having skill in the art with the aid of the present disclosure. For example, the SAP particles 404 may be in granular form, or alternatively, powder, flake, pelletized or rod-shaped SAP products may also be used. By way of example, pelletized SAPs may be formed through a pelletization process or an extruding process and may optionally include an additive in the pellet, such as fertilizer.

[0066] The biodegradable packet 400 holds the SAP particles 404 in a defined location for a particular amount of time before the packet 400 degrades. When planted adjacent the actual or anticipated root system of a plant, the packet 400 localizes the SAP particles 404 adjacent the root zone. The packet 400 also may help to prevent the loss of SAP particles 404 during application and/or in runoff conditions such as heavy rainfall and the like.

[0067] In embodiments having a packet 400 formed of porous material 401, the packet 400 allows water or other fluids to interact with the hydrophilic SAP product 404 and to thereby form a gelatinous body of SAP product 404 within the packet 400. Because the packet 400 is biodegradable, the packet 400 degrades over time, permitting release of the SAP product 404 into the root zone. The biodegradable nature of the packet 400 also does not require the removal of the bag from its planted location.

[0068] Additional additives may be introduced into the matrix 402 of the biodegradable packet 400. Any additive to promote plant growth may be included in the matrix 402 as would be apparent to those having skill in the art with the aid of the present disclosure. For example, one exemplary additive includes fertilizers 406. Various fertilizers 406 that are commercially available may be included as would be apparent to those having skill in the art. In some embodiments, controlled-release fertilizers may be used. Alternative or additional additives 408 that may also be included within the matrix 402 of the packet 400 may include pesticides, herbicides, fungicides, growth hormones and regulators, mycorrhizal fungi, kelp products, soil- based nutrients and the like.

[0069] Exemplary pesticides, fungicides, herbicides, plant-growth regulators and soil-based nutrients described above with respect to the horticulture mat 100 may also optionally be included in the matrix 402 of the agricultural supplement packet 400 as desired.

[0070] The SAP particles 404 within the agricultural supplement packet 400 promote growth of the seed, seedling or plant adjacent to where the packet 400 is applied, as well as facilitate a more efficient uptake of nutrients, etc. Plant growth is facilitated by promoting the availability of beneficial nutrients to the plant, root, seed, or seedling. The high absorptivity of the SAP particles 404 facilitates entrapment of the fertilizers 406 and other additives 408 heretofore described, thereby minimizing or eliminating disassociation or release of the additive 408 from the SAP matrix due to heavy rainfall, watering, etc. Because some amount of the additive 408 will become entrapped in the matrix of the SAP product 404, the runoff rate of additives 408 is significantly less than the runoff rate of additives applied directly to soil, plants, roots, seedlings, or seeds.

[0071] Agricultural supplement packet 400 sizes may vary. An exemplary agricultural supplement packet 400 contains between about 1 and about 100 grams or larger of matrix 402 material. Alternatively, an exemplary supplement packet 400 contains between about 5 and about 100 grams of SAP particles 404 and additives 408. Alternatively, a supplement packet 400 contains between about 10 and about 50 grams of matrix 402 material.

[0072J Figure 5 represents one embodiment of an agricultural supplement packet 500 containing superabsorbent polymer particles planted adjacent the root system 510 of a plant 512, as shown from a side elevation view. The supplement packet 500 may be planted adjacent the actual or anticipated root zone 510 of the plant 512. According to one exemplary method, the packet 500 is placed laterally of the root system 510 instead of above or below it. This method of planting the supplement packet 500 to a lateral side of the root system 510 may be desirable when the soil dynamics pull water and/or other nutrients transversely across the root hairs 510. However, the packet 500 may be placed in alternative locations, such as below the root system 510, as desired.

[0073] In one setting the supplement packet 500 may be planted adjacent an existing plant 512. In another setting the supplement packet 500 may be placed in a pot or hole into which a plant or seed may be planted. The soil 514 surrounding the plant 512 and packet 500 may be watered. Upon watering, the supplement packet 500 may dissolve or biodegrade such that its contents are in direct contact with the soil adjacent the root system 510. Additionally or alternatively, a liquid additive, such as liquid fertilizer, pesticide, herbicide, etc., may be delivered to plant 512 and packet 500 and become absorbed into the matrix of the SAP particles of the packet 500. [0074] Application of the SAP-containing supplement packet 500 in proximity to a plant 512, root system 510, seed or seedling promotes the availability of beneficial nutrients and/or water to the plant 512, root 510, seed or seedling. Increasing the availability of nutrients and/or water may affect an increase in crop yield, growth rate, seed germination, and/or plant size, and may affect earlier seed germination and/or blooming, decreased irrigation requirements, increased propagation, increased crop growth, increased crop production, decreased soil crusting, increased root development, stronger/heartier plants, and plants less susceptible to disease.

[0075] It is believed that the movement from areas of high to lower concentrations is a mechanism by which nutrients are released from advanced polymer-coated controlled-release fertilizers. Including advanced polymer-coated fertilizer in the supplement packet 500 allows the nutrient solution to diffuse over time from the packet 500 to the root system 510. Aggressive root development may be promoted when feeding of transplants and adsorption of nutrients to nearby soil particles occurs.

[0076] Because the matrix of the agricultural supplement packet 500 is selected to maximize product performance in various settings, compositional parameters, such as solids concentration, concentration of starch, concentration of additives, types of additives, numbers of additives, addition processes, and addition timing, may vary greatly. Therefore, the following examples are intended to further illustrate exemplary embodiments, and are not intended to limit the scope of the disclosure.

[0077] Example 1:

A porous, biodegradable bag including the following formulation:

Total nitrogen content: 14% (Nitrate: 5.88%; Ammoniacal: 8.12%)

Available phosphoric acid (P₂O₅): 14%

Soluble potash (K₂O): 14%

Sulfur (combined): 4.5%

[0078] Example 2:

A biodegradable bag including the following blend of ingredients and having a total mass of 30 grams: 22% total nitrogen (coated slow-release nitrogen) 10% phosphoric acid (5% coated slow-release phosphate) 7% soluble potash (coated slow-release potash) 1.73% calcium 1.68% magnesium 1.60% combined sulfur 0.16% iron 0.24% manganese 0.06% zinc 0.01% copper 0.05% boron

[0079] The plant nutrients contained in the biodegradable bag in Example 2 were derived from homogenous polymer coated ammonium nitrate, ammonium phosphate, calcium phosphates, and potassium sulfate. The nitrogen, phosphorus and potassium sources have been coated to provide 12.6% coated slow-release nitrogen, 12.6% coated slow-release available P₂O₅, 12.6% slowly available soluble K₂O₁ and 4.0% slow-release sulfur.

[0080] Use of porous, biodegradable bags including SAPs and additives have been shown to increase seedling growth from 250% to 400%, as well as to increase effective plant root systems from 50% to 100% over non-treated seedlings in the first three to five years. Also, use of the biodegradable bags increases plant and seedling survival and establishment in harsh conditions.

[0081] Depending on the type of packet used and the composition of additives within the bag, a single bag may fertilize an area for five years, making the porous, biodegradable bags a cost-effective means of fertilizing an area and improving plant growth. Furthermore, the use of the biodegradable packets or bags provide an additional benefit of its ease and convenience of use and application. [0082] Moreover, the use of agricultural supplement packets described herein reduce the human exposure to the planting medium, including exposure to chemicals, the SAP product, the additives, and any dust derived therefrom. The efficiency and accuracy of applying SAP products and additives may be improved because the amount of SAP product and additive is pre-measured based on the desired application so human error and application time is minimized. The use of the supplement packets may also ensure the prolonged presence of the SAP product and prolonged delivery of the additive used in conjunction with the SAP product. [0083] The supplement packet may also reduce the loss of SAP product and additive to the air (in the form of dust) that occurs in conventional, dry applications. The supplement packet also may reduce the loss of SAP product and additives through leaching. Moreover the packets also provide for a reduction in groundwater contamination, toxicity, odor, volatility, and decompositional problems compared to the application of fertilizers not entrapped in an SAP matrix and packet. [0084] Figure 6 represents a root system 610 of a plant 612 being dipped into a SAP hydrogel 600, as shown from a perspective view. The SAP hydrogel 600 may be created from mixing a powdered SAP product, such as those heretofore described, with water or another liquid, such as liquid fertilizer. The hydrogel 600 may be mixed in a receptacle, such as a 5-gallon bucket 614. The SAP product may be added to the liquid, or conversely the liquid may be added to the SAP product. The composition may then be mixed. According to one exemplary embodiment, approximately 3/4 cup of SAP product (approximately 3 oz.) may be mixed with approximately 5 gallons of water.

[0085] Upon mixing, the resulting composition may be left to stand until the

SAP product is hydrolyzed. The hydrolyzed mixture may then optionally be stirred until the resulting hydrogel 600 mixture is homogenous. The hydrogel 600 has a viscosity sufficient to cling to the plant root system 610 when the root system 610 is clipped into the hydrogel 600. The root system 610 may be partially submersed into the hydrogel 600, or may be completely immersed into the hydrogel 600. [0086] The plant 612 may then be removed from the hydrogel 600 and the excess hydrogel clinging to the root system 610 is allowed to drain off. The plant 612 having a SAP-coated root system 610 may then be planted in soil, transported to a remote location and subsequently planted in soil, or stored for a period of time and then subsequently planted.

[0087] In an alternative setting, the SAP hydrogel 600 disclosed may be used in conjunction with plant cuttings. A plant cutting may be obtained and an opening may be created within the cutting. The cutting may then be dipped into the SAP hydrogel 600 such that the hydrogel is allowed to be disposed within the opening created in the cutting. The cutting may then be stored, transported, or planted as desirable.

[0088] According to some embodiments additional agricultural additives may be added to the SAP hydrogel 600 at some point during preparation of the hydrogel ^;600. The agricultural additives may be added at various stages during preparation of the hydrogel 600, and may be added in solid form, or in liquid form as would be apparent to those having skill in the art with the aid of the present disclosure. Exemplary additives that may be introduced into the SAP hydrogel 600 mixture may include fertilizer. Various fertilizers that are commercially available may be included as would be apparent to those having skill in the art. In some embodiments, controlled-release fertilizers may be used.

[0089] Alternative or additional additives that may also be included within the

SAP hydrogel 600 may include pesticides, herbicides, fungicides, growth hormones and regulators, mycorrhizal fungi, kelp products, soil-based nutrients and the like. Exemplary pesticides, fungicides, herbicides, plant-growth regulators and soil-based nutrients described above with respect to the horticulture mat 100 may also optionally be included in the SAP hydrogel 600 as desired.

[0090] Because the matrix of the SAP hydrogel 600 may be selected to maximize product performance in various settings, compositional parameters, such as solids concentration, concentration of starch, concentration of additives, types of additives, numbers of additives, addition processes, and addition timing, may vary greatly. Therefore, the following examples are intended to further illustrate exemplary embodiments, and are not intended to limit the scope of the disclosure. [0091] Example 3:

[0092] 3 OZ. of powdered SAP product (90% starch-g-poly (2-propenamide-co-

2-ρropenoic acid) potassium salt) was slowly sprinkled as a thin film at intervals on the surface of five gallons of water. The SAP product was mixed between intervals using an electric drill equipped with a paint mixer apparatus. The drill speed was initially set on low speed to avoid water splashing out of the receptacle. The drill speed was increased as the mixture became more viscous.

[0093] When clumps In the mixture developed, the mixture was allowed to stand for 30 minutes until the SAP product was fully hydrolyzed. The hydrolyzed mixture was stirred thoroughly for 10 minutes to form homogenous mixture. The SAP hydrogel was allowed to stand for 15 minutes, and subsequently stirred again.

[0094] Example 4:

[0095] 3 oz. of powdered SAP product (90% starch-g-poly (2-propenarnide-co-

2-propenoic acid) potassium salt) was slowly sprinkled onto the surface of five gallons of water while rapidly stirring with a paint stick. The mixture was allowed to stand until clumps of SAP product hydrolyzed, while occasionally stirring and pressing larger clumps of SAP product against the side of the container. Once the SAP product was fully hydrolyzed, the mixture was stirred to form a homogenous mixture.

[0096] The methods disclosed for delivering a SAP to a plant via a hydrogel and the SAP hydrogel compositions disclosed herein may reduce desiccation of roots during transportation and storage and may further reduce stress and shock of the plant during planting. Once the root system is placed within the ground, the SAP products disclosed provide enhanced moisture around bare roots in comparison to conventional methods. This enhanced moisture content may encourage establishment, particularly seedling establishment.

[0097] The SAP products for use with the root dipping methods disclosed may be made available in hydrogel form, or alternatively, as a powdered, granulized, pelletized, or flake SAP product that may be ready for hydrolyzation once added to water or other liquid.

[0098] Figure 7 represents one embodiment of a SAP applicator 700 dispensing a SAP hydrogel 702, as shown from a perspective view. For purposes of this application, the term "hydrogel" as used herein includes among its conventional usage and definition, slurries of various viscosities. The viscosity of the SAP hydrogel 702 may vary as required by the particular SAP applicator 700 and agricultural application. The SAP hydrogel 702 may be produced by dissolving SAP product, such as those described herein, in water or some alternative aqueous fluid to form a hydrogel. According to one embodiment, pelletized SAP particles having a 100 mesh size may be used in forming the SAP hydrogel.

[0099] According to the embodiment depicted in Figure 7, the SAP applicator

700 may be a squeezable plastic dispensing container having an elongate neck portion 704 and a body cavity portion 706 that may contain a majority of the SAP hydrogel 702. In one embodiment, the body cavity portion 704 may be constructed of a flexible plastic material that can be squeezed by a user when it is desirable to dispense the SAP hydrogel 702 contained therein. Upon applying pressure to the body cavity portion 704, the SAP hydrogel 702 exits the applicator 700 upon passing through the elongate neck portion 704.

[00100] In this embodiment, the body cavity portion 704 may be considered a squeezable segment. Alternative embodiments may have alternative segments that can be squeezed and/or compressed by a user to deliver the SAP hydrogel 702 disposed within the applicator 700. Exemplary alternative segments may include trigger or button mechanisms, plunger operated mechanisms, or similar mechanisms that would be known to those having skill in the art with the aid of the present disclosure. By having a squeezable segment of the applicator 700, a user need not come into direct contact with the SAP hydrogel 702 while dispensing the same. [00101] The elongate neck portion 704 may optionally be constructed of a plastic material that is more rigid than the flexible body cavity 706 so that the elongate neck portion 704 may penetrate and be inserted into plant-growing media, such as soil. In alternative embodiments the SAP applicator 700 may include a rigid component, that is optionally removable, to penetrate plant-growing media. Upon creating a hole or cavity in the plant-growing media, the rigid component may be removed and SAP hydrogel 702 is subsequently dispensed into the hole or cavity created in the plant-growing media. In yet other alternative embodiments, the SAP applicator 700 may include an alternative dispensing component, such as a pour spout instead of an elongate neck portion 704.

[00102] Furthermore, additional embodiments of the SAP applicator 700 are within the scope of the present disclosure. For instance, the SAP applicator may comprise a rigid tube containing SAP hydrogel, the tube optionally having a cone shaped tip for delivering the SAP hydrogel to the particular agricultural application. In such an embodiment, the SAP hydrogel may be discharged using a piston-type caulk gun delivery mechanism. Alternatively a flexible squeeze applicator similar in construction to a toothpaste tube may be used.

[00103J Moreover, a syringe-type dispenser may be employed. In some embodiments a single plunger syringe may be used to inject the SAP hydrogel into the desired plant-growth media. In other embodiments, dual or multiple plunger syringes may be used. For example, in a dual plunger syringe applicator, the SAP hydrogel may be disposed within one cylinder of the syringe, while additives, such as fertilizers, herbicides, pesticides, fungicides, growth promoting additives and the like may be disposed within the other cylinder. Upon application, the SAP hydrogel may be mixed before leaving the applicator, or alternatively after exiting the applicator. Furthermore, the additive may be pre-mixed with the SAP hydrogel as would be apparent to those having skill in the art with the aid of the present disclosure. [00104] In other embodiments, the SAP applicator may comprise a canister, similar to a compressed air canister, optionally including a tubular member extending therefrom, such as a straw, for applying the SAP hydrogel. In yet other embodiments, a holding tank coupled to a hose and nozzle, wherein the SAP hydrogel is optionally under pressure, may be used.

[00105] Mechanized equipment may further be used as a SAP applicator for larger scale application of SAP hydrogel via mechanical means known to those having skill in the art. Alternative SAP applicators for delivering the SAP hydrogel to a desired plant-growing medium may also be used as would be apparent to those having skill in the art with the aid of the present disclosure.

[00106] The SAP applicator 700 may further include indicators of dosing amounts of SAP hydrogel 702 that may be delivered to plant-growing media. For example, the indicators may comprise lines disposed on the body cavity portion 706 of the applicator 700 to indicate a volume of SAP hydrogel 702 to be delivered per plant or per a number of plants.

[00107] The SAP applicator 700 may include additional additives premixed with, or configured to be delivered with the SAP hydrogel 702. For example, various fertilizers that are commercially available may be included as would be apparent to those having skill in the art. In some embodiments, controlled-release fertilizers may be used. Alternative or additional additives that may also be included within the SAP applicator 700 may include pesticides, herbicides, fungicides, growth hormones and regulators, mycorrhizal fungi, kelp products, soil-based nutrients and the like. [00108] Exemplary pesticides, fungicides, herbicides, plant-growth regulators and soil-based nutrients described above with respect to the horticulture mat 100 may also optionally be included in the SAP applicator 700 as desired. [00109] The SAP hydrogel 702 promotes growth of the seed, seedling or plant where the SAP hydrogel 702 is applied, as well as a more efficient uptake of nutrients, etc. Plant growth is facilitated by promoting the availability of beneficial nutrients to the plant, root, seed, or seedling. The high absorptivity of the SAP hydrogel 702 facilitates entrapment of fertilizers and other additives heretofore described, thereby minimizing or eliminating disassociation or release of the additive from the SAP matrix due to heavy rainfall, watering, etc. Because some amount of the additive will become entrapped in the matrix of the SAP hydrogel 702, the runoff rate of additives is significantly reduced.

[00110] Figure 8 represents one embodiment of a SAP applicator 800 dispensing a SAP hydrogel 802 adjacent a root system 810 of a plant 812. According to one exemplary method of delivering a SAP in agricultural applications, a SAP applicator 800 as heretofore described is obtained. The SAP applicator 800 may include an elongate neck portion 804 that may be inserted into plant-growing media, such as soil 814. The neck portion 804 may vary in length depending upon the particular agricultural application. The neck portion 804 may be inserted adjacent the actual root system 810 of a plant, or in the context of a seed, seedling, or before planting, the anticipated location of the root system.

[00111] According to one embodiment, after the neck portion 804 is inserted into the plant-growing media 814, the body cavity portion 806 may be squeezed by the user to dispense the SAP hydrogel 802. Alternative mechanisms and methods for dispensing the SAP hydrogel 802 may be used as heretofore described, and as would be apparent to those having skill in the art.

[00112] According to the embodiment depicted in Figure 8, the body cavity portion 806 is maintained outside of the plant-growing media 814 while the SAP hydrogel 802 is being dispensed. Consequently, a user does not have to handle the SAP hydrogel 802, and there is relatively little if any clean up required. According to some embodiments, the SAP hydrogel 802 may be applied to the soil after, instead of traditionally before planting.

[001131 Application of the SAP hydrogel 802 in proximity to a root system 810 of a plant, seed or seedling promotes the availability of beneficial nutrients and/or water to the plant 812, seed or seedling. Increasing the availability of nutrients and/or water may affect an increase in crop yield, growth rate, seed germination, and/or plant size, and may affect earlier seed germination and/or blooming, decreased irrigation requirements, increased propagation, increased crop growth, increased crop production, decreased soil crusting, increased root development, stronger/heartier plants, and plants less susceptible to disease. [00114] Moreover, the use of the SAP applicators 700, 800 described herein reduce the human exposure to chemicals, the SAP hydrogel 802, the additives, etc. The efficiency and accuracy of applying the SAP hydrogel 802 and additives may be improved because the hydrogel is dispensed and maintained at the desired location adjacent the root system 810, The SAP applicator 800 may also reduce the loss of SAP product and additive to the air (in the form of dust) that occurs in conventional, dry applications. Moreover, the application of SAP hydrogel may also provide for a reduction in groundwater contamination, toxicity, odor, volatility, and decompositional problems compared to the application of fertilizers not entrapped in an SAP matrix. [00115] While specific embodiments and applications have been illustrated and described, it is to be understood that the present disclosure is not limited to the precise configuration and components disclosed herein. Various modifications, changes, and variations which will be apparent to those skilled in the art may be made in the arrangement, operation, and details of the components, compositions and methods disclosed herein without departing from the spirit and scope of the following claims.

Claims

CLAIMS:

1. A method of delivering a superabsorbent polymer to a plant, comprising: obtaining a matrix comprising superabsorbent polymer particles, the matrix located within a carrier; and depositing the carrier containing the matrix adjacent an actual or anticipated root system of a plant; wherein the superabsorbent polymer is a starch graft copolymer.

2. The method of claim 1 , wherein the superabsorbent polymer particles comprise acrylonitrile monomers.

3. The method of claim 1 , wherein the superabsorbent polymer particles comprise monomers that are at least one of the following: acrylic acid, acrylamide, methacrylamide, 2-acrylamido-2~rnethyl-propanesulfonic acid, methacrylic acid, vinyl sulfonic acid, ethyl acrylate, potassium acrylate, and derivatives and mixtures thereof.

4. The method of claim 1 , wherein the matrix further comprises at least one of the following: fertilizers, herbicides, pesticides, fungicides, and growth regulators.

5. The method of claim 1 , wherein the carrier comprises: a first biodegradable cellulose substrate disposed in sheet form; and a second biodegradable cellulose substrate disposed in sheet form and bonded to the first cellulose sheet, the first and second cellulose sheets forming a biodegradable mat; wherein the matrix comprising superabsorbent polymer particles is disposed between the first and second cellulose sheets.

6. The method of claim 5, wherein the matrix further comprises seeds disposed between the first and second cellulose sheets.

7. The method of claim 5, wherein depositing the carrier comprises depositing the biodegradable mat onto soil at a location where it is desirable to facilitate growth of plant life, and further comprising applying a fluid to the location where the cellulose mat was deposited.

8. The method of claim 1, wherein the carrier comprises a packet constructed of porous biodegradable cellulose material.

9. The method of claim 8, wherein depositing the carrier comprises placing the biodegradable packet to a lateral side of the actual or anticipated location of the root system of the plant.

10. The method of claim 1, wherein obtaining the matrix located within the carrier comprises mixing the superabsorbent polymer particles with a liquid to form a hydrogel.

11. The method of claim 10, wherein depositing the carrier comprises: obtaining a plant having a root structure; dipping at least a portion of the root structure of the plant into the hydrogel; and removing the root structure from the hydrogel.

12. The method of claim 11 , further comprising: transporting the plant to a remote location after removing the root structure from the hydrogel; and planting the root structure into soil after transporting the plant.

13. The method of claim 11 , further comprising: storing the plant for a period of time after removing the root structure from the hydrogel; and planting the root structure into soil after storing the plant.

14. The method of claim 1, wherein the matrix located within a carrier comprises a superabsorbent polymer hydrogel, the hydrogel being disposed within a dispensing container having an elongate neck portion through which the hydrogel passes when delivered to the actual or anticipated root system of a plant.

15. The method of claim 14, wherein depositing the carrier comprises inserting the elongate neck portion into plant-growing media adjacent the actual or anticipated location of a plant root system while a body cavity portion of the dispensing container remains outside the plant-growing media and depositing the hydrogel adjacent the actual or anticipated plant root system.

16. The method of claim 15, wherein the dispensing container delivers the hydrogel when a segment of the dispensing container is squeezed by the user.

17. An agricultural supplement delivery article, comprising: an agricultural supplement matrix comprising superabsorbent polymer particles comprising monomers that are at least one of the following: acrylonitrile, acrylic acid, methacrylamide, 2-acrylamido-2-methyl-propaπesulfonic acid, methacrylic acid, vinyl sulfonic acid, ethyl acrylate, potassium acrylate, and derivatives and mixtures thereof; and a first and second cellulose substrate, wherein the agricultural supplement matrix is disposed between the first and second cellulose substrates.

18. The delivery article of claim 17, wherein the first and second cellulose substrates are each disposed in a sheet, and the first and second cellulose sheets are bonded together to form a biodegradable mat, such that the superabsorbent polymer particles are disposed between the first and second cellulose sheets.

19. The delivery article of claim 18, further comprising seeds disposed between the first and second cellulose sheets.

20. The delivery article of claim 17, wherein the first and second cellulose substrates comprise a packet which is porous, the packet further containing at least one of the following: fertilizers, herbicides, pesticides, fungicides, and growth regulators.

21. A superabsorbent polymer applicator for administering a superabsorbent polymer in agricultural applications, comprising: a dispensing container having an elongate neck portion configured to be inserted into plant-growing media adjacent an actual or anticipated location of a plant root system while a body cavity portion of the dispensing container remains outside of the plant-growing media; and a superabsorbent polymer hydrogel disposed within the dispensing container; wherein the superabsorbent polymer hydrogel passes through the elongate neck portion when the superabsorbent hydrogel is delivered to a particular agricultural application.

22. The superabsorbent polymer applicator of claim 21, wherein the dispensing container is configured to deliver the superabsorbent polymer hydrogel when a segment of the dispensing container is squeezed by a user.

23. The superabsorbent polymer applicator of claim 21, further comprising at least one of the following: fertilizers, herbicides, pesticides, fungicides and growth regulators disposed within the dispensing container.