MXPA01001161A - Soil treatment compositions and their use - Google Patents

Abstract

The invention provides aqueous soil treatment compositions comprising water and dissolved ionic water-soluble fertilizer in an amount of at least 10 wt.%and dissolved water-soluble anionic polymer having at least 6 dl/g and ionic content at least 40 wt.%. Such concentrates can have low viscosity and be pourable and be used as concentrates for dilution in irrigation processes.

Description

"" ** > - 1 COMPOSITIONS OF TRATAMtilgPUEIi TERRAIN AND ITS USE This invention relates to compositions for soil or soil treatment, which can provide both fertilization and soil stabilization benefits, while being easy to handle using conventional equipment and its use in irrigation methods. . It is well known in agriculture to apply various inorganic fertilizers in crop areas. The growing areas can be harvest areas, which can be very large or smaller growing areas such as those in the greenhouse. Fertilizers can be supplied in various forms, in particular as solid compositions or as suspensions or solutions of the fertilizer in a liquid. Fertilizer solutions are generally supplied by the manufacturer as an aqueous concentrate in large batches of size of approximately one tonne by weight. The solutions contain high concentrations, often 10 to 80% by weight (dry solids) of dissolved inorganic fertilizer. It is usual to dose the concentrated fertilizer solution in the irrigation water in such a way that the solution is diluted and the fertilizer is applied to the soil during the irrigation. Various irrigation systems have been designed for convenient dosing of concentrated fertilizer solution. For example, large-scale irrigation is often carried out by spraying water in a growing area. Spray pumps that spray water from a spray manifold on the growing area are well known, 5 and are designed in such a way that the concentrated fertilizer solution can be dosed into the pump, mixed with water and diluted from this handle before the water is sprayed on the growing area. It is also known that some systems of Irrigation such as furrow irrigation and spray irrigation, as well as processes of natural origin, can lead to soil erosion. It is known to use various polymers as stabilizers in the field, when applied to the soil in aqueous solution. This stabilizes the terrain against erosion. Polymers of acrylamide and other ethylenically unsaturated monomers have been used as ground stabilizers. In general, it has been accepted that polymers that give optimum stabilization of the soil have a relatively low anion content (for example, Example 5 to 30% by weight) and also have a relatively high intrinsic viscosity, for example about 15 dl / g. These polymers tend to form viscous aqueous solutions unless they are used at low concentration. Normal industrial practice is to mix the polymer in powder or in the form of a reverse phase emulsion with water in Special dissolution apparatuses for forming an aqueous solution of the polymer having a concentration for example of 0.2 to 2% by weight. This solution can then be dosed into the irrigation water. 5 The Patent of the U.S.A. No. 3,798,838, describes a method for reducing water permeability in land by contacting them with an aqueous solution containing a water-soluble nutrient and a partially hydrolyzed water-soluble polyacrylamide. The solution that is contacted with the soil can not contain more than 2% by weight of the polymer or 5% by weight of the nutrient. Preferred amounts are much smaller, for example not greater than 0.3% by weight of the polymer and not greater than 0.05% by weight of the nutrient. In the examples, a proper solution of this is produced type. The concentration of polyacrylamide is 70 ppm. The level of nutrients is 1.15% by weight. The publication states that the polymer of the nutrients will have to dissolve in the irrigation water. In this way the polymer and nutrients will be added separately directly to the irrigation water to give the diluted solution applied to the ground. There is no suggestion in providing a more concentrated solution containing both components. If polymer were to be included in a solution with the concentrated aqueous solution of the fertilizer, the amount of polymer required to give a soil concentration (after dilution to the degree required for the fertilizer) would be high, i.e. at least 2% by weight. The polyacrylamide used in the examples ^ has 20 to 30% of its amide 5 hydrolyzed groups, that is to say 20 to 30% of anionic content. We have found that polymers of this type produce a highly viscous solution at these concentrations. As a result, the solution can not be processed in the same apparatus as the standard fertilizer solution. For the Therefore, the system of the U.S. Pat. No. 3,798,838, is limited to separate addition of the polymer and fertilizer to the irrigation water. This requires, in commercial practice, the provision of two separate addition points and replacement systems. Other publications describe various compositions that contain both a conventional low anionic soil conditioner and a fertilizer, such as EP-A-586,911 and JP-A-74/144087. JP-A-07/322753 and JP-A-071099833 each describe soil conditioning compositions containing acrylamide polymers. Aqueous compositions containing a fertilizer polymer are not described. JP-A-73/037738 also describes a composition suitable for spraying, comprising fertilizer, polyacrylamide and seeds, along with a collection of other such materials as cellulose and acidic sulphonic lignin. JP-A-51/124578 also describes a liquid fertilizer composition containing phosphorus fertilizer and a copolymer of acrylamide and unspecified amounts of potassium acrylate. It would be convenient to be able to provide a combined composition that benefits from both fertilization and soil stabilization, in order to avoid the need for separate addition points, but to be able to use dosing equipment currently in place for irrigation systems, instead of on-site equipment to process the fertilizer solution. These systems include pivots, rolling lines and drip systems. In accordance with the invention, we provide a aqueous soil treatment composition comprising water and in solution, (a) A fertilizer soluble in ionic water (for example inorganic or containing urea) at a concentration of at least 10% by weight, and 20 (b) A polymer water-soluble anionic having an intrinsic viscosity of at least 6 dl / g and formed from a water-soluble monomer or monomer mixture of which at least 40% by weight is anionic monomer. 25 In this way we provide a product of < ? - * simple packaging that provides both fertilization benefits and soil stabilization. The product in this manner is a composition for growth promotion. It can be produced by adding polymer to a standard concentrated solution of fertilizer, at a sufficiently high concentration to provide an appropriate polymer concentration in the soil after dilution of the concentrated solution in the standard form for fertilizer solutions. We find that the defined anionic polymers have a relatively high anionic monomer content, which results in lower viscosity problems than we observed with the standard low anionic or nonionic soil stabilization polymers. In fact, in the fertilizer solution, they have relatively low viscosities that can even be lower than 1,000 cps, in particular lower than 500 cps. In this way, the viscosity of the fertilizer solution is not increased to an inconvenient degree and the aqueous composition of the invention can be processed using the equipment that is in place for processing the fertilizer solution alone. An additional advantage of the defined polymers is that their low viscosity in the composition means that they can be added without difficulty to the fertilizer solution in the fertilizer production plant. Prevention l? The effective viscosity allows the composition to be processed in the fertilizer production plant using conventional equipment. We believe that the interaction between the fertilizer 5 which is an ionic salt and the defined anionic polymer is important in the invention. We believe that the polymer dissolves in the aqueous composition, but in the presence of the fertilizing salt, the polymer molecules do not fully extend, thus reducing the viscosity of the composition. However, as the composition is diluted during an irrigation process when mixing with the irrigation water, the concentration of fertilizer is reduced and the polymer molecules are able to fully extend and act as soil stabilizers. Similarly, if the composition is placed directly on an area of the land, the fertilizer gradually dissolves in the soil, thereby reducing its concentration around the polymer molecules, which again can extend and act as soil stabilizers. The invention provides an aqueous composition wherein the defined polymer (b) dissolves. That is, the polymer is brought to the solution in such a way that substantially no visible solid material remains. For some combinations of polymer and fertilizer, some ^^^^^^^^^^^^ É ^^^^^^^^^^^^^^^^^^^^^^^ m ^? ^ M ^^^^^^^^^ * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ It is necessary for the polymer molecules to extend comprehensively and solvate in the solution, In fact, we consider it useful in the invention if the polymer molecules, even if dissolved, do not extend completely into the solution. lower viscosity than they would have if they were fully extended. is soluble in water and in particular is soluble in an aqueous solution of fertilizer having the same concentration of fertilizer as the final aqueous composition that it is desired to produce. In general, the polymer is substantially linear and is not interlaced. 15 The polymer has intrinsic viscosity of at least 6 dl / g. In this specification, the intrinsic viscosity is measured by a suspended level viscometer at 20 ° C in 1M sodium chloride buffered to pH 7. That is, it is of a sufficiently high molecular weight to give a excess soil stabilization and it is not a low molecular weight material that will act as a dispersant. Preferably, IV is at least 8 dl / g, more preferably at least 9 dl / g. It can be up to 30 dl / g for example, but in general we find that the optimum combination of low viscosity of the composition and Terrain stabilization performance is given by polymers that have IV no greater than about 20 to 18 dl / g. Preferably IV is no greater than 16, more preferably no greater than 15 dl / g. Particularly preferred IV is in the range of 9 to 13 dl / g, especially 10 to 12 dl / g. The polymer is formed from monomer or mixture of water soluble monomers, usually ethylenically unsaturated monomer soluble in water. The anionic content, ie the proportion of anionic monomer in the The monomer mixture used to form the polymer is at least 40% by weight, preferably at least 45 or at least 50% by weight. In particular, it is at least 55% by weight. It may be up to 100% by weight, but preferably not more than 90% by weight, in particular not more than 80% by weight.

Particularly preferred polymers having anionic content in the range of 65 to 85% by weight. The monomer mixture used to form the polymer comprises at least 40% by weight of anionic monomer. This can be any monomer ethylenically unsaturated anionic convenient. It may be a sulphonic monomer, often a salt of sodium or other alkali metal, for example acrylamido propan sulfonic acid (AMPS). In general it is preferred that the anionic monomer be an ethylenically unsaturated carboxylic monomer, in particular acrylic or methacrylic monomer. Acid salts Acrylic is alkaline, in particular sodium. The polymer may contain small amounts of cationic monomer, for example, at 20% by weight or 10% by weight. weight, but usually the cationic monomer corpuscle is substantially 0. In general, the monomer is copolymerized with nonionic monomer, usually nonionic monomer soluble in ethylenically unsaturated water, such as acrylamide or methacrylamide, preferably acrylamide. Particularly preferred polymers are copolymers of acrylamide with sodium acrylate. The polymer is included in the composition in an amount such that when the composition is diluted to Irrigation, to the degree of dilution conventionally used for fertilizer solutions, provides an adequate concentration of polymer in the soil to give an acceptable soil stabilization performance. Concentration of polymer in the treatment composition of the aqueous soil of the invention is generally from 0.2 to 10% by weight, in particular at least 0.5 or at least 1% by weight. Preferably it is at least 1.5% by weight. Often it is not more than 7% by weight and particularly preferred compositions contain from 2 to 5% by weight of the polymer.

The composition also contains an ionic fertilizer in solution. In this way, the fertilizer must be soluble in water. Fertilizers for use in the invention can also be de-inerted as inorganic fertilizers or containing urea. The fertilizer is present in a concentration of at least 10% by weight and is usually as high as convenient, for example at least 20% by weight. Preferably it is at least 30% by weight. It can be as high as 70 or 80% by weight, but usually it is not greater than 60% by weight. Preferred concentration ranges are 30 or 40 to 55% by weight, for example about 50% by weight. Urea and any of the known inorganic fertilizer materials can be used, which provide nitrogen, phosphorus and / or potassium, either alone or in a mixture. These contain ionic salts and include ammonium nitrate, ammonium sulfate, monoammonium phosphate, diammonium phosphate, monopotassium phosphate, dipotassium phosphate, polyphosphate salts, potassium chloride and potassium sulfate, and calcium nitrate. Examples include urea / ammonium nitrate (32-0-0), potassium chloride (0-0-10), ammonium sulfate (8-0-0-9S), a mixture of calcium and ammonium nitrate and mixed fertilizers with the following analyzes: 18-0-8, 10-0-10, 3-18-18, 0-0-25-17S, 10-10-10 and 14-2-10-2 + 2.5% matter ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡! - * organic (OM). The invention is particularly useful when it is known that it is desired to use a particular fertilizer in the relevant land area. The invention allows the operator to select a polymer that gives, in combination with the selected fertilizer, an appropriate viscosity balance of the final composition and the stabilization performance of the soil. We find that any given polymer will not necessarily give optimal results for all fertilizers, but in general we find that polymers of the types defined in the invention are capable of giving an acceptable range of results, in combination with a range of fertilizers. The particular intrinsic viscosity and anionic content within the claimed ranges that are optimal for combination with any given fertilizer, as well as polymer concentration and fertilizer concentration, can be established by experimentation. In particular, we found that for use with UAN solution (32-0-0) polymers of anionic content of 60 to 70% by weight and IV of 9 to 11 dl / g, for example anionic content of 65% by weight and IV of 10 dl / g gives low viscosity and good soil stabilization performance. Polymers with higher anion content, for example 90 to 100% by weight, and slightly higher intrinsic viscosity, for example example 12 to 14 dl / g, give higher viscosity with the same fertilizer solution, even the compositions can still be handled and show particularly good stabilization performance. < #r 5 Polymers of anionic content of 60 to 70% and IV of 9 to 11 dl / g, give low viscosity and good performance of soil conditioning, in combination with fertilizers 8-0-0-9S (ammonium sulfate) and 0-0-10 (KCl). In combination with 8-0-0-9S, polymers of Anionic content of 90 to 100% by weight and IV of 12 to 14 dl / g, give a somewhat higher viscosity, but again the compositions remain manageable and show excellent stabilization performance. These polymers similarly give compositions of high but acceptable viscosity and excellent stabilization with fertilizers 10-0-10 and 10-10-10. With the fertilizers 18-0-18, 10-0-10, 10-10-10 and 14-2-10-2 + 2.5% OM, the polymers with anionic content of 60 to 70% by weight and IV of 9 to 11 dl / g also give reasonable viscosity and stabilization performance. Polymers of anionic content of 45 to 50% by weight (for example about 47% by weight) and IV of 10 to 12 dl / g (for example about 11 dl / g) also give reasonable viscosity and stabilization performance with 0 - 0-10 (KCl).

The aqueous composition of the invention can be made in any convenient form. For example, polymer can be added to ajaggf-a followed by fertilizer or both can be added simultaneously. Alternatively, the fertilizer can be added to a preformed polymer solution. However, it is generally preferred that the polymer be added to a preformed solution of the fertilizer. In particular, it is preferred that the polymer be added in solid form, ie powder or beads. It is possible to add it in other forms, such as reverse phase dispersion, but solid is preferred. Preferred solids are in the size range of 70 to 2000 mm and are prepared in a standard manner, for example by polymerization of beads or gel, followed by shredding and if necessary drying. The polymer, if added as a powder, can be added using known systems such as those described in US Pat. No. 4,086,663 and WO 94/19095 and available systems from Allied Colloids under the name JetWet (trademark). Thus in the invention we provide a process for the production of an aqueous composition of the invention which comprises providing a preformed aqueous solution of the fertilizer (a) and mixing it in the polymer (b) in powder form.

The composition should have a viscosity that makes the exosition easy to handle. In particular, it should be easy to handle (preferably for pumping, emptying or spraying) in it, equipment that is currently used for the addition of concentrated fertilizer solution to irrigation water and for the application of a concentrated fertilizer solution alone to the ground. The polymer can be added to the fertilizer at the fertilizer manufacturer's facility and in this way the viscosity should be sufficiently low that the resulting solution can be handled by equipment currently in place at these facilities. Preferably the viscosity is less than 4000 cPs, more preferably not more than 3000 cPs. In particular, it is not greater than 2000 and especially not greater than 1,000 cPs. It is particularly preferred that it is not greater than 600 cPs. It is usually at least 100 cPs and at least 200 cPs. Particularly preferred compositions have final viscosity of 200 to 500 cPs. In this specification the viscosity is measured using a Brookfield LVT viscometer at 30 rpm using the spindle 4. In this way the aqueous composition of the invention can be applied directly to the soil as a soil / fertilizer conditioning composition. However, the composition of the invention is particularly intended as a concentrate for use in irrigation, in whose processes it will be diluted and applied to the areas of the land. t5e this way can contain any known materials for inclusion in these compositions. In genersá? ** it does not contain additional materials such as oxidizing agents, reducing agents, soil materials or seed materials. The invention also provides a process for treating the land, which comprises irrigating an area of soil with water to which an aqueous soil treatment composition of the invention has been added. Suitable irrigation processes include drip irrigation, furrow irrigation and irrigation by dew In particular, the composition is suitable for use in spray irrigation processes where the irrigation water is pumped to a spray manifold and sprayed over a very large harvest area, for example at least one hectare (Ha) and even up to 100 Ha. These methods comprise pumping water through feed ducts and a mixing zone to a spray manifold that supplies one or more spray devices whereby the water is sprayed onto the crop area to be irrigated, and the aqueous composition of the invention is dosed to water in or before the mixing zone. Processes of this type ^^ t ^^^. ^^^^^ general are described in our unpublished PCT application No. PCT / GB98 / 01763. In this application it is essential to supply polymer in the form of a dispersion of water-soluble polymer particles in a liquid. In the present case, the polymer is of course included in the fertilizer solution, which is dosed in the standard form and thus this system is not necessary in the current case. However, other features of the system described in this application can be applied here. The invention will now be illustrated with reference to the following examples. In the following examples, 15 different fertilizers were used as follows: Urea / ammonium nitrate (32-0-0) Potassium muriate (0-0-10) Ammonium sulfate (8-0-0-9S) Nitrate of Calcium Ammonium 20 Fertilizers mixed with analysis: 18-0-8 10-0-10 3-18-18 0-0-25-17S 25 10-10-10 tt ", & E ^ s-_ft'p? ^ áe? í ^ ¡^? í? ^? íí ^ -l? ** ** fl ^ te ^ 14-2-10-2 + 2.5% OM Example 1 Several polymers of medium to high anionic charge and in the form of dry powder, were initially evaluated for their solubility and viscosity in concentrated solutions of fertilizers.This was estimated by adding the polymer powder to the fertilizer solution and drumming for four to five hours at medium speed The polymer powder was added in such an amount that it gave a concentration in the composition of about 2% by weight.The viscosities of the resulting products were measured using a Brookfleld LVT viscometer spindle 4 at 30 rpm. It was highly viscous, ie it could be emptied, flocculation and stabilization tests were carried out, both of these tests give an indication of the soil stabilization efficiency of the relevant polymer, in combination with the relevant fertilizer. or water with hardness of 34 ppm, to simulate the irrigation water commonly used in the US. (A region where large-scale irrigation is widely practiced). The polymers used were as follows: The polymer A: 14.6% by weight of sodium acrylate and 85.4% by weight of acrylamide, IV 16 di-polymer / g. Polymer B :: Copoxymer 65% by weight of sodium acrylate 35% by weight of acrylamide, IV 10 dl / g. Polymer C: Copolymer of 95.5% by weight of sodium acrylate and 4.5% by weight of acnlamide, IV 13 dl / g. Polymer D: Copolymer of 40% by weight of AMPS of sodium and 60% by weight of acrylamide, IV 18 dl / g. Polymer E: Copolymer of 20 in weight of AMPS of sodium and 80 in weight of acrylate of sodium, of low IV. The fertilizer solutions were all used as supplied by the manufacturer, with variant solids content of 10 to 80% by weight solids. Flocculation Water with a hardness of 34 ppm is added to a cylinder for measuring with a stopper, capacity of 1,000 ml (Approximately 950 g). The polymer solution and fertilizer are then added to 15 ppm before the rest of the water is added to a total of 1,000 g. The cylinder was inverted several times to allow the product to disperse. The soil fines (particles with size <500 mm of a clay-loam soil), 20 g, were added to the cylinder and the cylinder was vigorously stirred for 20 seconds before being allowed to stand by.

^^^ S ^^ # g &áiS ^^ 2fl two additional minutes, to allow flocculation to occur. An aliquot of a predetermined depth was then extracted and the turbidity was measured to estimate the effectiveness of the product. The clearer the water, the more effective the product is. Stabilization The previous test was repeated using standardized (sieved and dry) and non-fine ground clots. In this test, the cylinder was not shaken vigorously but inverted 10 times in 20 seconds before allowing it to stand for two minutes. The turbidity was then measured. A control was also carried out for the flocculation and stabilization tests, where water was used alone without any polymer present. 15 The results in Table 1 below show the effect of polymers in soil stabilization / flocculation. The stabilization test was only carried out on products that are for emptying and that produce good flocculation results. 20 Table 1 Sr *, aa faith ^. ^^^^^^^^^^^^^^^^^^^ JT • #? ^ 21 It can be seen from this example that polymer B having an anionic content of 65% by weight and IV of 10 dl / g, is particularly convenient to provide low viscosity and thus compositions for pumping and spraying. In particular, it gave a suitably low viscosity with two different fertilizers, UAN 32 and 8-0-0-9S. In this particular test, flocculation in the 8-0-0-9S solution was not optimal. It can also be seen that polymer C, which has a higher anionic content of 95.5% by weight, gives higher viscosities than polymer B, but lower than those of polymers A and B in UAN 32 solution. Furthermore, it gives good flocculation performance and stabilization. Polymers A and B give more viscosity values the ^^^^,. ^ U ^? ^^^^^^^^^^ - ^ l ^ ¡g g¡ | 2 * * * * * well elevated and the polymer does good flocculation. Example 2 In this experiment, the effects of IV and the anionic content of different polymers in different fertilizer solutions are estimated. EDF Experiment A factorial experiment design using sodium acrylate / acrylamide solid grade polymers (2% w / w aggregates to the fertilizer solution concentrate) covering a range of IDU from 10 to 24 and anion contents from 0 to 100%, was evaluated. In each case, the viscosity and flocculation of the resulting solutions were measured as in Example 1 above. This was done with a solution of potassium chloride (10% K +), which was similar to the 0-0-10 fertilizer solution (KCl). A control was performed, using 15 ppm of the KCl solution, without added polymer. The results of factorial experimental design are given in Table 2 below. Some products are listed 20 times. This is because two different lots were estimated. It will be seen that polymers that can give rather high viscosities can also give variable results from one lot to another. 25 ^^? ^ & i ^ i ^^^^ S ^^^^: ,,, ^^^^.

Table 2 fifteen twenty It can be seen from these results that polymer B again gives a low viscosity performance and good flocculation of this fertilizer solution. The polymers F, G, A, Q and K all have anionic content of less than 40% by weight and gave values ís & s7 '"i *"' "'" ssksái? 1 ***'? '* * • * - & £ ** •! * & * • - i? ite ^^^^ iaa.fcfc ^ of rather high viscosity, particularly the polymers G, A, Q and K. From the point of view of achieving low viscosity in con ± iinac? n with adequate flocculation performance, it seems that a value of IV from about 9 or 10 to about 13 to 14 tends to be optimal in combination with the anionic content of at least 40% by weight It also appears that the anion content of about 55 to 80% by weight may be optimal. With a fertilizer solution similar to the 0-0-10 solution (KCl), some of the polymers can give better performance with other types of fertilizer Example 3 In this example, flocculation tests were also carried out on the optimal polymers determined in Example 1 for each fertilizer, using a different type of terrain. These were estimated using terrain of a chalky sand nature. The optimum products for use in fertilizers UAN (32-0-0) and 8-0-0-9S were found in Example 1 as polymer B and polymer C, respectively. These were evaluated with a second type of terrain, a chalky sand. 8-0-0-9S is also estimated with polymer B, since this produces a much less viscous solution (640 cPs), than polymer C (3790 cPs). The results are as follows. Table 3 * (The figures in parentheses are the results of original turbidity for flocculation, when they are made in the first type of terrain in Example 1, clay clay). It can be seen that although flocculation in general is not as efficient as in the previously used terrain, nevertheless it was effective. AND? The solubilities of polymer B and polymer C (the optimum polymers determined in example 1) were estimated at 2% w / w in various fertilizer solutions. The viscosities of the polymers in fertilizer solutions were measured, if the polymers were soluble and if so, what was the flocculation efficiency. The results are given below in Table 4.

Table 4 * - Large amount of undissolved polymers after tumbling at night. Both products were insoluble in the fertilizer solution 3-18-18. These results again demonstrate the general utility of polymer B, which gave low viscosity solutions and good flocculation for a range of fertilizers. Polymer C could also give reasonable viscosity with certain fertilizers such as 18-0-8, 10-0-10 and 10-10-10. i Ai i.

Claims (6)

1. R ~ EIVIN?) ICACÍ0XES 1.- A composition for treatment of aqueous ground, characterized in that it comprises water and in solution (a) a fertilizer soluble in ionic water in an amount of at least 10% by weight, and (b) a water-soluble anionic polymer having intrinsic viscosity of at least 6 dl / g and formed from a monomer or mixture of water-soluble monomers, of which at least 40% by weight is anionic monomer.
2. 2. Composition according to claim 1, characterized in that the polymer (b) has an intrinsic viscosity of 8 to 18 dl / g.
3. 3. Composition according to claim 1 or 2, characterized in that the polymer (b) has an intrinsic viscosity of 9 to 12 dl / g.
4. 4. - Composition according to any preceding claim, characterized in that the polymer (b) is formed from a water-soluble monomer or mixture of monomers, comprising at least 50% of the anionic monomer.
5. 5. - Composition according to any preceding claim, characterized in that the polymer (b) is formed from a mixture of water-soluble monomers comprising 60 to 80% by weight of anionic monomer and 40 to 20% by weight of the nonionic monomer.
6. 6. - Composition according to any preceding claim, characterized in that the polymer (b) is a copolymer of acrylate with an alkali metal salt of acrylic acid. ? 3 '5 1. - Composition according to any preceding claim, characterized in that the polymer (b) is present in an amount of 2 to 5% by weight. 8. - Composition according to any preceding claim, characterized in that the 10 fertilizer (a) is present in an amount of 20 to 60% by weight. 9. - Composition according to any preceding claim, characterized in that it has a viscosity not greater than 4,000 cps preferably not greater than 15 1000 cps. 10. Composition according to any preceding claim, characterized in that it has a viscosity of 200 to 500 cps. 11. Composition according to any preceding claim, characterized in that the polymer (b) has been added to the composition in the form of a powder. 12. - A procedure for treatment of land, which includes irrigating an area of land with water 25 to which has been added a treatment composition of watery soil as it is effined in claim 1. 13. Method according to claim 12, characterized in that the irrigation is irrigation by spray. 14. - Method according to claim 12, characterized in that the water is pumped through feed ducts and a mixing zone to a spray manifold that supplies one or more spray devices, whereby the water is sprayed on a harvest area and the aqueous soil treatment composition is dosed into the water at or before the mixing zone. 15. Method for producing an aqueous soil treatment composition according to claim 1, characterized in that it comprises providing an aqueous solution of fertilizer (a) and mixing it with polymer (b) in powder form. 16. Method according to claim 12, or a method according to claim 15, characterized in that the aqueous soil treatment composition has any of the additional features of claims 2 to 10. The present invention provides waterborne soil treatment compositions comprising: The present invention provides aqueous soil treatment compositions comprising: water and fertilizers soluble in ionic water dissolved in an amount of at least 10% by weight and anionic polymer soluble in dissolved water having IV of at least 60 1 / g and an ionic content of at least 40% by weight. low viscosity and are emptied and used as concentrates for dilution in irrigation processes. 21900