JP4709027B2 - Turfgrass growth regulator - Google Patents

Description

  The present invention relates to a turfgrass growth regulator effective for hatching turfgrass.

  Conventionally, turf mowing has been indispensable for lawn management. However, turf mowing inherently causes some of the turf grass leaves to be lost due to mowing the lawn, which causes significant stress on the turf grass. In particular, when lawn mowing is performed repeatedly, the photosynthetic ability is reduced due to the decrease in leaf surface of turfgrass, and the entire turfgrass including roots is weakened. Once debilitated turfgrass becomes more susceptible to various stresses such as pathogens, physical damage, improper water supply, and environmental changes.

  Therefore, in order to keep turfgrass in a stress-free state, it is conceivable to reduce the number of trimmings as much as possible. However, if the number of trimmings is reduced, the turfgrass chief will become a problem this time. Applying a proper hatching technique is essential.

  In addition, the use of the cell molding seedling method is rapidly increasing in the production of turf seedlings. However, the cell molding seedling method produces turf seedlings with high density, so that the turf seedlings are easy to grow and effective as a measure to prevent turfgrass planting. New hatching technology is required. Thus, appropriate turfgrass hatching techniques are indispensable in both fields of lawn management and production today.

  Turfgrass hatching techniques include the use of hatching agents, reduction of fertilizer components, restriction of irrigation, air blowing, contact stimulation, salt stress, etc. Of these techniques, labor, cost, and effectiveness Considering the reproducibility of the turf and the ease of carrying out the hatching, it is advantageous to use a hatching agent for hatching turfgrass.

  Currently, drugs commonly used for hatching turfgrass include maleic hydrazide solution, paclobutrazole granules / hydrating agent, flurprimidol granules / hydrating agent, mefluidide solution, trinexapac ethyl agent, etc. However, all of these drugs are chemical pesticides based on synthetic compounds, and some of these compounds have been reported to be mutagenic. Many people are worried about phytotoxicity.

Many chemical pesticides in the above drugs are medicinal ingredients that depend on the concentration used, so knowledge and experience are required to select methods for avoiding phytotoxicity and when to use them, and careful use is required for their use. In addition, there is a concern that the actual occurrence of phytotoxicity and environmental pollution will become realistic. Accordingly, there is a strong demand for the emergence of a turfgrass sanitizing agent that is environmentally friendly, safe for the human body, low in cost, easy to use, and good in workability. However, such a turfgrass sanitizing agent has been developed at present. Not. The present inventors have previously disclosed an invention relating to a plant growth regulator containing cinnamic acid (Patent Document 1). However, in this document, no investigation was made on the suppression of turfgrass growth.
JP 2004-298176 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide turfgrass by having good workability, being environmentally friendly, less toxic, and reliably suppressing the length of turfgrass. It has an excellent hatching effect, improves the efficiency of lawn management in golf courses, soccer fields, school grounds, green spaces, etc. It is to provide a turfgrass growth regulator that can be improved.

  The above object is achieved by the present invention described below. That is, the present invention provides a turfgrass growth regulator comprising cinnamic acid.

In the turfgrass growth regulator, cinnamic acid is dispersed in an aqueous medium; cinnamic acid is dispersed using a dispersing agent; the cinnamic acid has a maximum solubility in water of free cinnamic acid. in concentrations above, and this obtained by dissolving in water by mosquitoes thione polymers are preferred.

  Further, in the turfgrass growth regulator, the cationic polymer is chitosan; the cinnamic acid concentration is 30% by mass or less; and further contains an environmentally decomposable polymer substance; Polyvinyl alcohol; Hydroxyalkylated, carboxymethylated or cationized water-soluble cellulose derivative; water-soluble starch derivative; water-soluble chitin derivative; water-soluble chitosan derivative; and water-soluble alginic acid derivative And for bermudagrass or kentucky bluegrass.

  According to the present invention, it has excellent workability, is environmentally friendly, has low toxicity, and exhibits an excellent hatching effect on turfgrass by reliably suppressing the length of turfgrass. It is possible to provide a turfgrass growth regulator that can improve turf seedling productivity by improving the efficiency of lawn management in fields, schoolyards, green spaces, etc., and by realizing space-saving seedling raising of turfgrass .

  Next, the present invention will be described in more detail with reference to preferred embodiments. Cinnamic acid used as an active ingredient of a turfgrass growth regulator in the present invention is a plant-related naturally-occurring substance and also a food additive, and is therefore a very safe substance. Cinnamic acid also has an antibacterial and antifungal action (Japanese Patent Laid-Open No. 5-117125). Therefore, the turfgrass growth regulator of the present invention is effective not only for hatching turfgrass but also for maintaining environmental hygiene of the lawn. Demonstrate.

  The turfgrass growth regulator of the present invention may be in any form such as a powder, a mixture with other carriers or culture soil, a solution or dispersion in a liquid medium such as water. From the viewpoint of ease of management and ease of use, it is preferably in the form of an aqueous dispersion or an aqueous solution.

  When the turfgrass growth regulator of the present invention is an aqueous dispersion, cinnamic acid may be dispersed alone, but a stable dispersion can be obtained by dispersing using a dispersant. The amount of the dispersant used may be in the range of 10 to 100% by mass of cinnamic acid.

  As the dispersant used above, any dispersant can be used as long as it is a dispersant used in an aqueous medium. For example, a natural product system, an inorganic compound system, a polymer system, or a special activator system is used. Examples of natural products include lignin sulfonate and carboxymethyl cellulose (CMC). Examples of inorganic compounds include condensed phosphates such as hexametaphosphate. Polymers include, for example, poly Examples thereof include acrylates, salts of acrylic acid-maleic acid copolymers, and salts of olefin-maleic acid copolymers. As the special activator system, for example, alkyl diphenyl ether disulfonate, polycyclic special nonionic activator and the like are used.

  Further, as the aqueous dispersant, various anionic, cationic, nonionic, or amphoteric surfactants derived from natural products are used. Examples of the anionic surfactant include sulfated and sulfated salts of fats and oils such as castor oil, rapeseed oil and olive oil, and aerosol type surfactants obtained by adding sulfuric acid to esters of maleic acid and higher alcohols. And amide sulfates obtained by condensing fatty acid chloride and taurine which is amine sulfonic acid, naphthalene sulfates, α-olefin sulfates, and the like.

  Examples of the cationic surfactant include primary amines such as alkylamine acetates, alkylamine hydrochlorides, alkyldiethanolamine salts, and quaternary ammonium salts such as alkyldimethylbenzylammonium chloride. Examples include pyridinium salts.

  Nonionic (nonionic) surfactants include, for example, polyoxyethylene adducts of esters of polyhydric alcohols and fatty acids such as glycerin, sorbitol, sorbitan, and sucrose; higher alcohols, alkylphenols, castor oil, polyoxypropylene Polyoxyethylene adducts such as: ethylene oxide polymerization addition surfactants such as polyoxyethylene adducts of sorbitol and sorbitan fatty acid esters; alkylol amides of fatty acids such as monoethanolamine-fatty acid condensates and diethanolamine-fatty acid condensates Type surfactants and the like.

  Examples of amphoteric surfactants include amino acid surfactants such as betaine surfactants, dodecyldiaminoethylglycine hydrochloride, and N-tetradecyl taurine soda salt. Particularly preferable among the above exemplified dispersants are natural product-based dispersants such as lignin sulfonate and CMC which are less likely to cause environmental pollution.

  As a dispersion medium used for the dispersion liquid, water or a mixed solvent of water and an organic solvent such as alcohols, ketones, esters, and ethanolamines soluble in water is used, and water is particularly preferable.

  The cinnamic acid can be dispersed in an aqueous medium by a generally known dispersion method using a dispersing agent in dispersing various particles. For example, cinnamic acid and a dispersing agent are mixed in an aqueous medium, and the mixture is placed in a container of a dispersing machine such as a sand mill and subjected to a dispersion treatment to obtain an aqueous dispersion type turfgrass growth regulator of the present invention.

  The sand mill used for the above dispersion is filled with spherical particles with a small diameter (0.2 to 5.0 mm) as a dispersion medium in a cylindrical container to 30 to 95% of the internal volume, and the dispersion medium is stirred inside the container. It has a structure provided with a rotating mechanism. The volume of the cylindrical container is 0.3 to 250 liters, and the material is preferably made of, for example, stabilized zirconia, alumina, or rubber. The material of the dispersion medium is, for example, stabilized zirconium, alumina, glass beads, or the like. Can be used. The operating conditions are, for example, a rotational speed of 100 to 3,000 rpm, and a cinnamic acid slurry supply rate of 0.2 to 5,000 ml / min. Therefore, it is desirable to pass the disperser several times as necessary.

  During the dispersion, the concentration of cinnamic acid in the dispersion is not particularly limited, but for example, it is usually preferably about 10 to 30% by mass. If the concentration is too low, there is a problem of cost. On the other hand, if the concentration is too high, it is not always easy to dilute uniformly during actual use. In actual use of the dispersion, the dispersion having a concentration of 30% by mass is diluted to about 30 to 3,000 times by mass. Further, in the case of an aqueous dispersion having a concentration of about 10% by mass, it is diluted to about 10 to 1,000 times by mass when used. The same applies to a cinnamic acid aqueous solution described later.

  In a preferred embodiment of the present invention, cinnamic acid is dissolved in an aqueous medium to form a turfgrass growth regulator. Since the solubility of free cinnamic acid in water is 0.546 g / l (25 ° C.), an alkaline solubilizing agent should be used for dissolving cinnamic acid in order to dissolve cinnamic acid in an aqueous medium beyond the solubility. Is preferred. A preferable solubilizing agent can be used as long as its aqueous solution is a salt or base of a weak acid and a strong base that exhibit alkalinity, but exhibits pH buffering action, is less susceptible to environmental pollution, and is safe for the human body. Is preferred.

  Examples of salts of weak acids and strong bases include sodium tripolyphosphate, potassium tripolyphosphate, sodium polyphosphate, potassium polyphosphate, trisodium phosphate, tripotassium phosphate, dipotassium hydrogen phosphate, disodium hydrogen phosphate, carbonate As the base, potassium, sodium carbonate, sodium acetate, potassium acetate and the like are preferable, for example, sodium hydroxide, potassium hydroxide and the like. Particularly preferred solubilizers include sodium tripolyphosphate, potassium hydroxide, potassium carbonate, sodium acetate, and the like designated for food additives.

  When the cinnamic acid aqueous solution is produced, an aqueous solution of a cinnamic acid can be easily obtained by preparing an aqueous solution of a solubilizing agent in advance, adding cinnamic acid thereto and mixing and dissolving it. Although the usage-amount of a solubilizing agent is not specifically limited, The quantity used as 35-300 mass% of cinnamic acid is preferable. By using the solubilizing agent in this manner, an aqueous solution having a cinnamic acid content exceeding the maximum solubility of free cinnamic acid in water at room temperature is 30% by mass or less. In view of storage space of the aqueous solution, transport efficiency, etc., the preferred cinnamic acid concentration is 0.5 to 30% by mass.

  Moreover, a cationic polymer can be used as a dissolution aid. The cationic polymer is neutralized with cinnamic acid, whereby cinnamic acid can be brought into an aqueous solution state. Preferred examples of the cationic polymer include chitosan, polyethyleneimine, polyallylimine, and cationized cellulose, but the cationic polymer is not particularly limited. For example, when chitosan is used, its amino group Both substances can be dissolved in water in the form of neutralizing with cinnamic acid, and a safe and highly concentrated cinnamic acid aqueous solution can be obtained. Although the usage-amount of a cationic polymer is not specifically limited, The quantity used as 50-200 mass% of cinnamic acid is preferable.

  Furthermore, by making various materials coexist in the turfgrass growth regulator of the present invention, it is possible to obtain a more practical turfgrass growth regulator having delayed action and low contamination. For example, a coexistence relationship with cinnamic acid is established in some form such as mixing, salt formation, inclusion, etc., by mixing high-molecular substances that are soluble in aqueous media and that are environmentally degradable such as UV degradation, hydrolysis, and microbial degradation. Thus, an effect-controlling type (slow-effect type) or scattering-suppressing type turfgrass growth regulator can be obtained.

  Polymeric substances that are soluble in the above aqueous medium and are environmentally degradable include environmentally low-load polyvinyl alcohol, water-soluble cellulose derivatives that are hydroxyalkylated, carboxymethylated, and cationized polysaccharides, water-soluble Starch derivatives, water-soluble chitin derivatives, water-soluble chitosan derivatives, water-soluble alginic acid derivatives and the like can be used. As a specific example, chitosan swollen with water disclosed in JP-A-63-41504 is reacted with cinnamic acid in an alcohol with about 0.8 to 1.0 mol per amino group of chitosan. By forming a salt of chitosan and cinnamic acid by a method or the like, it can be used as a solid with good handling. In this way, a sustained release effect of cinnamic acid, which is an active ingredient, can be expected. Moreover, since this salt compound is water-soluble, it can be used as an aqueous solution.

  The chitosan used above is obtained by deacetylation of chitin present in the crust shells of crabs and shrimps, and is a well-known material per se with various degrees of deacetylation and various degrees of deacetylation. Those having a molecular weight can be easily obtained from the market and can be easily produced. In the present invention, any of these known chitosans can be used, but those having a degree of deacetylation of 30% or more and a viscosity of 1% acetic acid 1% chitosan aqueous solution of 1 to 10,000 mPa · s are suitable. In particular, those having a deacetylation degree of 50% to 90% and a 1% acetic acid 1% chitosan aqueous solution having a viscosity of 5 to 1,000 mPa · s are particularly preferably used.

  When the turfgrass growth regulator of the present invention further contains chitosan in addition to cinnamic acid, it exhibits a more significant hatching effect than that without chitosan. The reason for this is that by mixing chitosan and cinnamic acid, in addition to the above-mentioned hatching effect of cinnamic acid, (1) the hatching effect of jasmonic acid derived from chitosan, and (2) cinnamic acid as a raw material It is thought that this is because various effects such as hatching effects by plant growth inhibitors such as flavanone or chalcone synthesized as a general function. The mechanism of (1) is considered as follows. Chitosan is considered to be decomposed by microorganisms when mixed with soil to produce chitosan oligomers. This oligomer is known to act as an elicitor (a substance that causes a higher plant to cause a defense reaction). By this action, turfgrass synthesizes a substance exhibiting antibacterial activity called phytoalexin. Specifically, turfgrass is considered to exhibit a hatching effect by synthesizing jasmonic acid having a plant growth inhibitory action. Moreover, as the mechanism of (2), the jasmonic acid further activates the synthetic system of turfgrass phytoalexin, and as a result, a plant growth inhibitor such as flavanone or chalcone using cinnamic acid as a raw material is smooth. It is considered that the hatching effect is exhibited by the synthesis.

  Examples of turfgrass to be hatched by the turfgrass growth regulator of the present invention include both warm and cold turfgrass. Examples of the warm-type turfgrass include Himekoraishiba, Koraishiba, Noshiba, Bermudagrass, St. Augustinegrass, buffalograss, centipedegrass, carpetgrass, bahiagrass, etc., but particularly effective for Bermudagrass. In addition, Kentucky Bluegrass, Tall Fescue, Creeping Red Fescue, Chewing Fescue, Hard Fescue, Perennial Ryegrass, Italian Ryegrass, Creeping Ventgrass, Colonial Ventgrass etc. are listed as target turfgrass, but Kentucky Bluegrass etc. The effect is great.

  The turfgrass growth regulator of the present invention can be applied, for example, to turfgrass in various forms, or by soaking turfgrass roots or stems in an aqueous solution or dispersion thereof, or the turfgrass originally exists around the roots. It works as a moisturizer by sucking up an aqueous solution or dispersion of cinnamic acid. Cinnamic acid is absorbed from the stem, leaves, or roots and migrates through the turfgrass and exerts a hatching effect. Since it moves to the whole turfgrass after spraying, some unevenness is allowed.

  The form of use of the turfgrass growth regulator of the present invention is not particularly limited, but cinnamic acid, which is the turfgrass growth regulator as described above, is easily dispersed in water as a powder or granules, and cinnamic acid is either water or It is used as a liquid such as a solution, emulsion, dispersion or suspension with another solvent.

  When the turfgrass growth regulator of the present invention is used as a liquid, it may be diluted to a predetermined concentration in advance or used as a concentrated solution after use. Furthermore, if necessary, it can be used by mixing with a spreading agent, other plant growth regulators, droughting agents and other additives. Moreover, it can also be used as a powder in which the above cinnamic acid is supported on a carrier such as cyclodextrin, zeolite, or silica, or as a suspension thereof.

  The amount of the turfgrass growth regulator of the present invention is not particularly limited, but the particularly effective amount is 0.0001 to cinnamic acid per 100 parts by mass of the total amount of soil for cultivation (including fertilizer and additives). The amount is 0.2 parts by mass. If the amount used is too large, the growth of the plant may be adversely affected, and if it is too small, the sufficient effect may not be exhibited.

  Generally, hatching agents are classified into a foliar spray agent that absorbs hatching components from leaves and stems, and a soil irrigation agent that absorbs hatching components from roots and exhibits hatching effects. The foliar spray is diluted about 200 times the stock solution and sprayed on the foliage by spraying. It is effective to treat the shoots when they start growing, but some plants may not be effective. Moreover, since a chemical | medical agent remains on a leaf surface or a stem, a chemical | medical agent may transfer to a human body by contacting the said plant body, and safety | security becomes a problem when the toxicity of a chemical | medical agent is high. On the other hand, a soil irrigation agent directly applies a chemical to soil or cultivated soil, and relatively easily develops a hatching effect. If the effect is not manifested by a foliar spray, a soil irrigation agent is used. In addition, since the soil irrigation agent does not adhere to the plant surface, it is not necessary to consider the transfer of the drug from the plant surface to the human body.

  In contrast to the above-mentioned conventional drought agents, the turfgrass growth regulator of the present invention is mainly composed of cinnamic acid that is naturally present in plants, and is extremely safe. Although it can be used extremely safely as an agent, a hatching effect can be expected when used as a soil irrigant. Cinnamic acid, which is the main ingredient, is a food additive, and it has not been suspected of being a mutagenic agent or an environmental hormone found in tanning agents based on chemically synthesized substances. It has.

  In general, when the fungicide is classified according to its activity, it can be divided into anti-auxin and anti-gibberellin, but the turfgrass growth regulator of the present invention exhibits anti-auxin. That is, cinnamic acid, which is the main component of the turfgrass growth regulator of the present invention, disturbs the action of auxin, a plant hormone involved in cell division and elongation, resulting in suppression of cell division, abnormal enhancement of respiratory action, etc. It is estimated that the turfgrass height is suppressed and the hatching effect is expressed.

  The turfgrass growth regulator of the present invention can reduce turfgrass mowing by reducing the turfgrass plant height, or reduce the number of turfgrass cuts, thus reducing not only turfgrass stress but also steep slopes and roads. It can also be used in places where frequent lawn mowing is difficult, such as separation zones, and it brings great benefits to turf grass health promotion, ensuring the safety of lawn managers, and saving energy in lawns. For example, in a lawn of a sports facility such as a soccer field or a golf course, it can be used for turfgrass suppression processing around a portion that is difficult to cut or around a line, such as at the pole, so that it can contribute to rationalization of lawn management costs. Furthermore, since the turfgrass growth regulator of the present invention also has an effect of suppressing lawn fungi such as Rhizoctonia, Fusarium, Psium (Japanese Patent Laid-Open No. 5-117125), it is very useful in terms of lawn management. In addition, when producing cell-molded turf seedlings, it can be effectively applied to a wider range of applications, such as effectively preventing turf seedling growth, and a great contribution to the development of lawn-related industries can be expected.

  Next, the present invention will be described more specifically with reference to examples. In the text, “parts” and “%” are based on mass, and the cinnamic acid concentration is based on 100 parts by mass of the total amount of the aqueous solution or dispersion.

[ Reference Example 1]
(Preparation of 0.05% and 0.2% cinnamic acid aqueous solutions)
Dissolve 18.4 g of potassium hydroxide in 400 ml of distilled water at 20 ° C., add 50 g of cinnamic acid, stir and dissolve, make the total volume 500 ml with distilled water, and use cinnamic acid 10% cinnamic acid / hydroxylated. A potassium solution (pH 8.8) was prepared. Next, this aqueous solution was diluted 200 times and 50 times with distilled water to prepare aqueous solutions having cinnamic acid concentrations of 0.05% and 0.2%.

(Turfgrass hatching test using lawn cultivation kit using soccer field)
Canned lawn cultivation kit "Little Pitch (Manufacturing: Sakata Seed Co., Ltd., Sales: Yokohama Marinos Co., Ltd., Diameter: 8cm, Height: 3.5cm)" Then, the attached turf seeds (species used in Yokohama International Stadium) were sown on the cultivation soil. This was placed in the dark at 20 ° C. to germinate seeds. Then, after cultivating at 20 ° C. under light irradiation (illuminance: 1,100 lux) and measuring the length (plant height) from the soil surface of each lawn can to the top of the turf on the seventh day after sowing, Add 50ml of the above 0.05% and 0.2% cinnamic acid aqueous solution to each 4 cans of soil for cultivation, and add 0.05% cinnamic acid aqueous solution and 0.2% cinnamic acid respectively. It was set as the aqueous solution addition section. In addition, four cans of ordinary watering were prepared and used as a control. On the 20th day after sowing, the plant height was measured again, and the hatching rate (the hatching rate (%) = {(plant length elongation in the control group−plant height elongation in the added group) / control) The plant height elongation of the ward} × 100) was calculated, and the hatching effect of the cinnamic acid aqueous solution was examined (plant height elongation = plant height on the 20th day after sowing−plant height on the seventh day after sowing).

  The results are shown in Table 1 below. From the results shown in Table 1, it became clear that 0.05% and 0.2% cinnamic acid aqueous solutions are effective for hatching turf used in soccer fields.

[Example 2]
(Preparation of cinnamic acid-chitosan aqueous solution)
Cinnamic acid (40 g) was dissolved in 410 ml of heat-purified water with stirring, and 50 g of chitosan (deacetylation degree 82%, acetic acid 1% chitosan 1% concentration solution viscosity 7 mPa · s) was added and further stirred and mixed. This was filtered through a G1 glass filter to obtain a cinnamic acid-chitosan aqueous solution. Next, this aqueous solution was diluted 160 times and 40 times with distilled water to give cinnamic acid-chitosan aqueous solution 1 (cinnamic acid concentration 0.05%, chitosan concentration 0.063%) and cinnamic acid-chitosan aqueous solution 2 ( A cinnamic acid concentration of 0.2% and a chitosan concentration of 0.25%) were prepared.

(Turfgrass hatching test using lawn cultivation kit using soccer field)
Canned lawn cultivation kit "Little Pitch (Manufacturing: Sakata Seed Co., Ltd., Sales: Yokohama Marinos Co., Ltd., Diameter: 8cm, Height: 3.5cm)" Then, the attached turf seeds (species used in Yokohama International Stadium) were sown on the cultivation soil. This was placed in the dark at 20 ° C. to germinate seeds. Then, after cultivating at 20 ° C. under light irradiation (illuminance: 1,100 lux) and measuring the length (plant height) from the soil surface of each lawn can to the top of the turf on the seventh day after sowing, 50 ml of the above cinnamic acid-chitosan aqueous solution 1 (cinnamic acid concentration 0.05%, chitosan concentration 0.063%) and cinnamic acid-chitosan aqueous solution 2 (cinnamic acid concentration 0.2%, chitosan concentration 0) per lawn can .25%) was added to each of the 4 cans of soil for cultivation, and each was treated with 1 cinnamic acid-chitosan aqueous solution and 2 with cinnamic acid-chitosan aqueous solution. In addition, four cans of ordinary watering were prepared and used as a control. Cultivation of cans in each group was continued, and the plant height was measured again on the 20th day after sowing, and the hatching rate (the hatching rate (%) = {(plant length elongation in the control group−plant length elongation in the added group) / control) The plant height elongation of the ward} × 100) was calculated, and the hatching effect of the cinnamic acid-chitosan aqueous solution on the turf was examined (plant height elongation = plant height 20 days after sowing−plant height 7 days after sowing).

The results are shown in Table 2 below. From the results in Table 2, cinnamic acid-chitosan aqueous solution 1 (cinnamic acid concentration 0.05%, chitosan concentration 0.063%) and cinnamic acid-chitosan aqueous solution 2 (cinnamic acid concentration 0.2%, chitosan concentration 0.25%) It became clear that it is effective for hatching of turf used in soccer fields.
Both Reference Example 1 and Example 2 used cinnamic acid aqueous solution, but the hatching rate of Example 2 further containing chitosan was 0.05% compared to the hatching rate of Reference Example 1 not containing chitosan. When cinnamic acid aqueous solution is used, it is 111%, and when cinnamic acid aqueous solution is used, it is 125%, and the hatching rate is improved. The difference in these effects is considered to be due to the combined use of cinnamic acid and chitosan.

[ Reference Example 3]
(Preparation of 0.2% cinnamic acid aqueous dispersion)
160 g of cinnamic acid, 80 g of dispersant (“Sun extract” manufactured by Nippon Paper Industries Co., Ltd., sodium lignin sulfonate) and 293 g of water were mixed, and 1,800 g of glass beads (1 to 1.25 mm in diameter) were added thereto. This was put into a cylindrical container of a disperser (parallel 6-cylinder test sand mill manufactured by RMM Co., Ltd.) and subjected to a dispersion treatment at 120 rpm for 3 hours to obtain a 30% cinnamic acid aqueous dispersion (cinnamate acid dispersion). The average particle size was 0.3 μm). Next, this dispersion was diluted 150 times with distilled water to obtain a 0.2% cinnamic acid aqueous dispersion.

(Effect of cinnamic acid on mixed turfgrass)
Household culture soil ("Gardening Soil" manufactured by Hirota Shoten) was filled into a natural material connection pot (Sakata Seed Co., Ltd. "Jiffy Strip", 50 x 50 mm) and sufficiently irrigated. After 20 cells of this connection pot (10 connections × 2 sheets) were stored in the bottom water supply tray (Sakata Seed Co., Ltd., “Half Tray”, 270 × 270 mm), turf seeds ( Sakata Seed Co., Ltd .; mixed species, evergreen lawn grass). After sowing, they were placed in a 20 ° C. indoor aluminum greenhouse (440 × 840 × 1,500 mm) for germination. After measuring the length (plant height) from the culture soil surface to the top of the turf on the sixth day after placing the connection pot, the above cinnamic acid aqueous dispersion was added to the culture soil in the connection pot. One set of connection pots (20 cells) was used as a 0.2% cinnamic acid aqueous dispersion addition group, and 5 ml of 0.2% cinnamic acid aqueous dispersion per cell was added to the culture soil. Further, another set of connection pots was used as a control group, and the same amount of water was added in place of the cinnamic acid aqueous dispersion. After that, cultivation of turf seedlings in each ward was continued under normal conditions. Cultivation was continued for the seedlings in the two sections, and the plant height was measured again on the 13th day after placement, and the hatching rate (the hatching rate (%) = {(plant length elongation in the control group−plant height elongation in the added group) / control group) Plant length elongation} × 100) was calculated, and the hatching effect of the cinnamic acid aqueous dispersion was examined (plant height elongation = plant height on the 13th day after placement−plant height on the 6th day after placement).

  The results are shown in Table 3 below. From the results in Table 3, it was revealed that 0.2% cinnamic acid aqueous dispersion was effective for hatching turf (mixed species).

[ Reference Example 4]
(Incubation effect of cinnamic acid on warm grass turfgrass grass)
Household culture soil ("Gardening Soil" manufactured by Hirota Shoten) was filled into a natural material connection pot (Sakata Seed Co., Ltd. "Jiffy Strip", 50 x 50 mm) and sufficiently irrigated. After 20 cells of this connection pot (10 connections × 2 sheets) were stored in the bottom water supply tray (Sakata Seed Co., Ltd., “Half Tray”, 270 × 270 mm), turf seeds ( Takii Seed and Seed Co., Ltd. (Western turf, Bermuda grass) was sown. After sowing, they were placed in a 20 ° C. indoor aluminum greenhouse (440 × 840 × 1,500 mm) for germination. After measuring the length from the culture soil surface to the top of the turf (plant height) on the 6th day after placing the connection pot, the cinnamic acid aqueous solution of Reference Example 1 was added to the culture soil in the connection pot. One set of connection pots (20 cells) was used as a 0.2% cinnamic acid aqueous solution addition group, and 5 ml of 0.2% cinnamic acid aqueous solution was added to the culture soil per cell. Further, another set of connection pots was used as a control group, and the same amount of water was added instead of the cinnamic acid aqueous solution. After that, cultivation of turf seedlings in each ward was continued under normal conditions. Cultivation was continued for the seedlings in the two sections, and the plant height was measured again on the 13th day after placement, and the hatching rate (the hatching rate (%) = {(plant length elongation in the control group−plant height elongation in the added group) / control group) Plant height elongation} × 100) was calculated, and the hatching effect of the cinnamic acid aqueous solution was examined (plant height elongation = plant height on the 13th day after placement-plant height on the 6th day after placement).

  The results are shown in Table 5 below. From the results of Table 5, it was revealed that 0.2% cinnamic acid aqueous solution is effective for hatching warm-ground turfgrass bermudagrass.

[ Reference Example 5]
(Incubation effect of cinnamic acid on cold-type turfgrass Kentucky bluegrass)
Household culture soil ("Gardening Soil" manufactured by Hirota Shoten) was filled into a natural material connection pot (Sakata Seed Co., Ltd. "Jiffy Strip", 50 x 50 mm) and sufficiently irrigated. After 20 cells of this connection pot (10 connections × 2 sheets) were stored in the bottom water supply tray (Sakata Seed Co., Ltd., “Half Tray”, 270 × 270 mm), turf seeds ( (Tohoku Co., Ltd .; Western turf, Kentucky bluegrass). After sowing, they were placed in a 20 ° C. indoor aluminum greenhouse (440 × 840 × 1,500 mm) for germination. After measuring the length from the culture soil surface to the top of the turf (plant height) on the 6th day after placing the connection pot, the cinnamic acid aqueous solution of Reference Example 1 was added to the culture soil in the connection pot. One set of connection pots (20 cells) was used as a 0.2% cinnamic acid aqueous solution addition group, and 5 ml of 0.2% cinnamic acid aqueous solution was added to the culture soil per cell. Further, another set of connection pots was used as a control group, and the same amount of water was added instead of the cinnamic acid aqueous solution. After that, cultivation of turf seedlings in each ward was continued under normal conditions. Cultivation was continued for the seedlings in the two sections, and the plant height was measured again on the 13th day after placement, and the hatching rate (the hatching rate (%) = {(plant length elongation in the control group−plant height elongation in the added group) / control group) Plant height elongation} × 100) was calculated, and the hatching effect of the cinnamic acid aqueous solution was examined (plant height elongation = plant height on the 13th day after placement-plant height on the 6th day after placement).

  The results are shown in Table 5 below. From the results shown in Table 5, it was revealed that 0.2% cinnamic acid aqueous solution is effective for hatching of cold region turfgrass Kentucky bluegrass.

[ Reference Example 6]
(Comparison test of turfgrass hatching effect with commercial herbicides)
Canned lawn cultivation kit "Little Pitch (Manufacturing: Sakata Seed Co., Ltd., Sales: Yokohama Marinos Co., Ltd., Diameter: 8cm, Height: 3.5cm)" Then, the attached turf seeds (species used in Yokohama International Stadium) were sown on the cultivation soil. This was placed in the dark at 20 ° C. to germinate seeds. Then, after cultivating at 20 ° C. under light irradiation (illuminance: 1,100 lux) and measuring the length (plant height) from the soil surface of each lawn can to the top of the turf on the 6th day after sowing, As shown in Table 6 below, cinnamic acid aqueous solution, commercially available herbicide A, and commercially available herbicide B are added to each of 4 cans of soil for cultivation, and cinnamic acid aqueous solution added group, commercially available herbicide A added group, and commercially available herbicide B added, respectively. It was set as a ward. In addition, four cans of only normal watering were prepared and used as control areas. On the 14th day after sowing, the plant height was measured again, and the hatching rate (the hatching rate (%) = {(plant length elongation in the control group−plant height elongation in the added group) / control) The plant height elongation of the ward} × 100) was calculated, and the hatching effect of the cinnamic acid aqueous solution was examined (plant height elongation = plant height 14 days after sowing−plant height 6 days after sowing).

  The results are shown in Table 7 below. From the results in Table 7, it became clear that cinnamic acid aqueous solution has a turfgrass hatching effect equivalent to or higher than that of commercially available herbicides.

According to the present invention, it has good workability, is environmentally friendly, has low toxicity, and exhibits an excellent hatching effect by reliably suppressing turf length, golf course, soccer field, school yard, green space It is possible to provide a turfgrass growth regulator that can improve the efficiency of lawn management and improve productivity by realizing space-saving seedling raising.

Claims (6)

A turfgrass growth regulator , wherein cinnamic acid is dissolved in water with a cationic polymer at a concentration exceeding the maximum solubility of free cinnamic acid in water . Turfgrass growth regulator according to claim 1 wherein the cationic polymer is chitosan. The turfgrass growth regulator according to claim 1 or 2 , wherein the cinnamic acid concentration is 30% by mass or less. The turfgrass growth regulator according to any one of claims 1 to 3 , further comprising an environmentally degradable polymer substance. The environmentally degradable polymer substance comprises polyvinyl alcohol; hydroxyalkylated, carboxymethylated or cationized water-soluble cellulose derivative; water-soluble starch derivative; water-soluble chitin derivative; water-soluble chitosan derivative; and water-soluble alginic acid derivative The turfgrass growth regulator according to claim 4 , which is at least one selected from the group consisting of: The turfgrass growth regulator according to any one of claims 1 to 5 , which is used for Bermudagrass or Kentucky Bluegrass.