Plant fertilizer absorption enhancer and plant fertilizer containing the same

Abstract

To provide an agent for promoting the absorption of a fertilizer component by a plant, designed to improve the absorption efficiency of a fertilizer component (e.g. potassium, phosphorus, nitrogen) in a treated plant.SOLUTION: An agent for promoting the absorption of a fertilizer component by a plant includes unsaturated oxo fatty acid or a derivative thereof or a salt thereof.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a plant fertilizer absorption enhancer and a plant fertilizer containing the same. [Background technology]

[0002] Technologies for regulating plant growth have been developed with the aim of improving the supply efficiency of grain plants and horticultural plants. In addition to measures such as optimizing temperature and sunlight conditions and fertilization, methods for improving the absorption efficiency of fertilized components have been reported.

[0003] Patent Document 1 discloses a plant vitality agent that uses fatty acids or derivatives thereof to improve the absorption rate of at least one of the main components of plant fertilizers, nitrate ions, phosphate ions, and potassium ions, by 10% or more.

[0004] However, the plant vitality agent described in Patent Document 1 was still not sufficient to adequately improve the absorption efficiency of fertilizer components. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2001-288011 [Overview of the project] [Problems that the invention aims to solve]

[0006] The present invention aims to improve the absorption efficiency of fertilizer components (potassium, phosphorus, and nitrogen) in plants to which the fertilizer has been applied. [Means for solving the problem]

[0007] The present invention relates to a plant fertilizer component absorption enhancer containing an unsaturated oxo fatty acid or its derivative or a salt thereof.

[0008] Preferably, the plant fertilizer component absorption promoter further comprises a hydroxy fatty acid, a derivative thereof or a salt thereof.

[0009] Preferably, the plant fertilizer component absorption promoter further comprises an unsaturated fatty acid (excluding unsaturated oxo fatty acids and unsaturated hydroxy fatty acids).

[0010] In the plant fertilizer component absorption promoter, the unsaturated oxo fatty acid, a derivative thereof or a salt thereof is represented by the following formula (I): HOOC-(R 1 )-CH=CH-C(=O)-R 2 (I) (wherein, R 1 is a linear or branched, saturated or unsaturated hydrocarbon group containing 6 to 12 carbon atoms, R 2 is an alkyl group having 2 to 8 carbon atoms, which may contain one or more branches and / or double bonds) which is an unsaturated oxo fatty acid having the structural formula, a derivative thereof or a salt thereof.

[0011] In the plant fertilizer component absorption promoter, the unsaturated oxo fatty acid is an unsaturated oxo fatty acid wherein R 1 of the unsaturated oxo fatty acid is a hydrocarbon group having 8 to 10 carbon atoms, and R 2 of the unsaturated oxo fatty acid is an alkyl group having 4 to 6 carbon atoms.

[0012] In the plant fertilizer component absorption promoter, the unsaturated oxo fatty acid is an unsaturated oxo fatty acid wherein R 1 of the unsaturated oxo fatty acid comprises a double bond that forms a conjugated double bond with the double bond between the α-carbon and β-carbon of the carbonyl group in formula (I).

[0013] In the plant fertilizer component absorption promoter, the unsaturated oxo fatty acid is an unsaturated oxo fatty acid wherein R 1 of the unsaturated oxo fatty acid is a linear or branched hydrocarbon group having 9 carbon atoms, and R 2However, it is an unsaturated oxo fatty acid, which is an alkyl group with 5 carbon atoms.

[0014] The aforementioned plant fertilizer component absorption enhancer, wherein the unsaturated oxo fatty acid is ketooctadecadienoic acid.

[0015] The aforementioned plant fertilizer component absorption enhancer, wherein the unsaturated oxo fatty acid is 13-oxo-9,11-octadecadienoic acid.

[0016] The aforementioned plant fertilizer component absorption enhancer, wherein the hydroxylated fatty acid or its derivative or salt thereof comprises the following formulas (II) and / or (III): HOOC-(R 3 )-CH(OH)-CH(OH)-CH=CH-CH(OH)-R 4 (II) HOOC-(R 3 )-CH(OH)-CH=CH-CH(OH)-CH(OH)-R 4 (III) (In the formula, R 3 This refers to a linear or branched hydrocarbon group having 4 to 12 carbon atoms, which may contain one or more double bonds and / or OH groups, and if it contains double bonds, the position of the double bonds is not limited. R 4 (This refers to a linear or branched hydrocarbon group having 2 to 8 carbon atoms, which may contain one or more double bonds and / or OH groups, and if it contains double bonds, the position of the double bonds is not limited.) It is a hydroxylated fatty acid or a derivative thereof having the structural formula shown, or a salt thereof.

[0017] The aforementioned plant fertilizer component absorption enhancer, wherein the hydroxylated fatty acid is R 3 The hydrocarbon group has 6 to 8 carbon atoms, R 4 The hydrocarbon group has 4 to 6 carbon atoms.

[0018] The aforementioned plant fertilizer component absorption enhancer, wherein the hydroxylated fatty acid is R3 However, -(CH2) n -(n is an integer between 4 and 12) is the structure, R 4 However, C n H 2n+1 The structure is -(n is an integer between 2 and 8).

[0019] The aforementioned plant fertilizer component absorption enhancer, wherein the hydroxylated fatty acid is R 3 However, it is an alkylene group with 7 carbon atoms (-(CH2)7-), and R 4 However, it is an alkyl group with 5 carbon atoms (CH3CH2CH2CH2CH2-).

[0020] The aforementioned plant fertilizer component absorption enhancer, wherein the hydroxylated fatty acid is hydroxyoctadecenoic acid.

[0021] The aforementioned plant fertilizer component absorption enhancer, wherein the hydroxylated fatty acid is 9,10,13-trihydroxy-11-octadecenoic acid.

[0022] The aforementioned plant fertilizer component absorption enhancer, wherein the hydroxylated fatty acid is 9,12,13-trihydroxy-10-octadecenoic acid.

[0023] The aforementioned plant fertilizer component absorption enhancer, wherein the unsaturated fatty acid (excluding unsaturated oxo fatty acids and unsaturated hydroxylated fatty acids) is an unsaturated fatty acid having 10 to 20 carbon atoms.

[0024] The aforementioned plant fertilizer component absorption enhancer, wherein the unsaturated fatty acid (excluding unsaturated oxo fatty acids and unsaturated hydroxylated fatty acids) is a monounsaturated or polyunsaturated fatty acid containing at least one selected from the group consisting of oleic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, and arachidonic acid.

[0025] The aforementioned plant fertilizer component absorption enhancer, wherein the unsaturated fatty acid is linoleic acid.

[0026] The aforementioned plant fertilizer absorption enhancer and plant fertilizer containing plant fertilizer components.

[0027] Note that "octadecenoic acid" is also conventionally written as "octadecaenoic acid" (for example, in Japanese Patent Publication No. 3-14539, etc.), and the above-mentioned "9,10,13-trihydroxy-11-octadecenoic acid" is also written as "9,10,13-trihydroxy-11-octadecaenoic acid" or "9,10,13-trihydroxyoctadeca-11-enoic acid". Similarly, the above-mentioned "9,12,13-trihydroxy-10-octadecenoic acid" is also written as "9,12,13-trihydroxy-10-octadecaenoic acid" or "9,12,13-trihydroxyoctadeca-10-enoic acid". In the examples, the manufacturer's name is also indicated in parentheses. Furthermore, the above description applies to all instances of "octadecenoic acid" used in this specification, the claims, the drawings, and the abstract.

[0028] The structural formula of "9,10,13-trihydroxy-11-octadecenoic acid" is shown in structural formula (1) below.

[0029] [ka]

[0030] The structural formula of "9,12,13-trihydroxy-10-octadecenoic acid" is shown in structural formula (2) below.

[0031] [ka]

[0032] Furthermore, the derivatives of the unsaturated oxo fatty acid and hydroxylated fatty acid are preferably esters of the unsaturated oxo fatty acid and hydroxylated fatty acid, respectively. Also, as the salts of the unsaturated oxo fatty acid and hydroxylated fatty acid, as will be described later, salts such as sodium salts, potassium salts, and ammonium salts can be used.

[0033] It is preferable that the aforementioned plant fertilizer component absorption enhancer is used as a spray or immersion agent applied to the roots of plants, or as a soil drenching agent, or mixed with plant fertilizer or plant fertilizer components.

[0034] It is preferable that the aforementioned plant fertilizer absorption enhancer be used for plants selected from the Brassicaceae, Poaceae, Fabaceae, Solanaceae, Rosaceae, Amaranthaceae, or Malvaceae families.

[0035] The plant fertilizer component absorption enhancer of the present invention may be in liquid or powder form. In the case of a powder form, an aqueous dispersion containing an unsaturated oxo fatty acid or its derivative or salt thereof (which may optionally contain a hydroxylated fatty acid or its derivative or salt thereof and / or an unsaturated fatty acid (except unsaturated oxo fatty acid and unsaturated hydroxylated fatty acid)) is freeze-dried to obtain a powder.

[0036] Furthermore, it is desirable that the aqueous dispersion contains a stabilizer.

[0037] Furthermore, it is desirable that the stabilizer be an emulsifier.

[0038] Furthermore, it is desirable that the emulsifier be at least one selected from potassium carbonate and dipotassium hydrogen phosphate. [Effects of the Invention]

[0039] The plant fertilizer component absorption enhancer of the present invention can improve the absorption efficiency of potassium, phosphorus, and nitrogen, which are fertilizer components, by plants, and promote plant growth. Furthermore, the plant fertilizer component absorption enhancer of the present invention and the plant fertilizer containing plant fertilizer components have a high absorption efficiency of fertilizer components, and therefore have a high effect in promoting plant growth. [Modes for carrying out the invention]

[0040] The plant fertilizer component absorption enhancer of the present invention comprises an unsaturated oxo fatty acid or a derivative thereof or a salt thereof.

[0041] The plant fertilizer absorption enhancer of the present invention contains unsaturated oxo fatty acids or their derivatives or salts thereof. By applying this fertilizer absorption enhancer to a part of the plant roots, adding it to the soil, or mixing it with plant fertilizer, the absorption efficiency of potassium, phosphorus, and nitrogen from the soil or plant fertilizer can be increased, thereby promoting plant growth.

[0042] The plant fertilizer component absorption enhancer of the present invention preferably further contains hydroxylated fatty acids or their derivatives or salts. Hydroxylated fatty acids or their derivatives or salts have been shown to promote plant growth and can lead to increased yields of plants such as vegetables, grains, and fruits.

[0043] Furthermore, in plant fertilizer absorption enhancers containing unsaturated fatty acids (excluding unsaturated oxo fatty acids and unsaturated hydroxylated fatty acids) as active ingredients, rain and other factors may wash away the active ingredients from the soil, fertilizer, and the site of action. Such washing away of the active ingredients by rain, wind erosion, and other erosive forces can significantly reduce the duration of effectiveness of plant fertilizer absorption enhancers.

[0044] The plant fertilizer absorption enhancer of the present invention further contains unsaturated fatty acids in addition to the above-mentioned active ingredients, namely unsaturated oxo fatty acids or their derivatives or salts, and hydroxylated fatty acids or their derivatives or salts. Note that the unsaturated fatty acids of the present invention do not include unsaturated oxo fatty acids or unsaturated hydroxylated fatty acids. The unsaturated fatty acids contained in the plant fertilizer absorption enhancer of the present invention are hydrophobic and have low water solubility. As a result, the unsaturated fatty acids of the present invention can impart water-repellent properties to the plant fertilizer absorption enhancer in soil, fertilizer, and at the inoculation site. That is, the plant fertilizer absorption enhancer of the present invention is hardly washed away. Therefore, the fertilizer absorption enhancing effect lasts for a long period of time.

[0045] The unsaturated oxo fatty acid or its derivative or salt thereof according to the present invention is defined by the following formula (I): HOOC-(R 1 )-CH=CH-C(=O)-R 2 (I) (In the formula, R 1 : A linear or branched, saturated or unsaturated hydrocarbon group containing 6 to 12 carbon atoms. R 2 (An alkyl group having 2 to 8 carbon atoms, which may contain one or more branches and / or double bonds.) Unsaturated oxo fatty acids having the structural formula shown, or their derivatives or salts thereof, can be suitably used.

[0046] In one embodiment of the present invention, R in the above unsaturated oxo fatty acid 1 The hydrocarbon group has 8 to 10 carbon atoms, R 2 The alkyl group has 4 to 6 carbon atoms. In another embodiment, the R in the above unsaturated oxo fatty acid 1 R in formula (I) contains a double bond that forms a conjugated double bond with the double bond between the α and β carbons of the carbonyl group. Furthermore, in another embodiment, R in the above unsaturated oxo fatty acid 1 R is a linear or branched hydrocarbon group having 9 carbon atoms. 2 It is preferable that it is an alkyl group having 5 carbon atoms.

[0047] Specific examples of unsaturated oxo fatty acids used in the present invention include ketooctadecadienoic acid. For example, ketooctadecadienoic acid is not limited to these, but includes 9-oxo-10,12-octadecadienoic acid (9-oxoODA), 13-oxo-9,11-octadecadienoic acid (13-oxoODA), 5-oxo-6,8-octadecadienoic acid, 6-oxo-9,12-octadecadienoic acid, 8-oxo-9,12-octadecadienoic acid, 10-oxo-8,12-octadecadienoic acid, 11-oxo-9,12-octadecadienoic acid, 12-oxo-9,13-octadecadienoic acid, and 14-oxo-9,12-octadecadienoic acid, as well as their isomers.

[0048] Furthermore, esters are preferred as derivatives of unsaturated oxo fatty acids. The esters of unsaturated oxo fatty acids in the present invention are not limited to these, but include methyl esters, ethyl esters, propyl esters, butyl esters, pentyl esters, isopentyl esters, octyl esters, and the like. In addition, examples of salts of unsaturated oxo fatty acids include ammonium salts such as ammonium salts and alkylammonium salts such as tetramethylammonium salt, alkaline earth metal salts such as calcium salts and magnesium salts, alkali metal salts such as sodium salts, lithium salts and potassium salts, and metal salts such as cobalt salts and manganese salts, but are not particularly limited as long as they are one or more agriculturally acceptable salts, such as salts contained in fertilizers.

[0049] The hydroxylated fatty acid or its derivative or salt used in the present invention is the following formula (II) and / or (III): HOOC-(R 3 )-CH(OH)-CH(OH)-CH=CH-CH(OH)-R 4 (II) HOOC-(R 3 )-CH(OH)-CH=CH-CH(OH)-CH(OH)-R 4 (III) (In the formula, R 3 This refers to a linear or branched hydrocarbon group having 4 to 12 carbon atoms, which may contain one or more double bonds and / or OH groups, and if it contains double bonds, the position of the double bonds is not limited. R 4 (This refers to a linear or branched hydrocarbon group having 2 to 8 carbon atoms, which may contain one or more double bonds and / or OH groups, and if it contains double bonds, the position of the double bonds is not limited.) Hydroxylated fatty acids having the structural formula shown, or their derivatives or salts thereof, can be suitably used.

[0050] In one embodiment of the present invention, R in the above hydroxylated fatty acid 3 The hydrocarbon group has 6 to 8 carbon atoms, R 4 The hydrocarbon group has 4 to 6 carbon atoms. In another embodiment, the R in the above hydroxylated fatty acid 3 is, -(CH2) n -(n is an integer between 4 and 12) is the structure, R 4 C n H 2n+1 -(n is an integer between 2 and 8) structure. Furthermore, in another embodiment, R in the above hydroxylated fatty acid 3 This is an alkylene group (-(CH2)7-) with 7 carbon atoms, and R 4 It is preferable that the element is a C5 alkyl group (CH3CH2CH2CH2CH2-).

[0051] Specifically, examples of hydroxylated fatty acids in the present invention include hydroxyoctadecenoic acid. For example, examples of hydroxyoctadecenoic acid include, but are not limited to, 9,10,13-trihydroxy-11-octadecenoic acid and / or 9,12,13-trihydroxy-10-octadecenoic acid and their isomers.

[0052] Furthermore, esters are preferred as derivatives of hydroxylated fatty acids. The esters of hydroxylated fatty acids of the present invention are not limited to these, but examples include methyl esters, ethyl esters, propyl esters, butyl esters, pentyl esters, isopentyl esters, octyl esters, etc. As for salts of hydroxylated fatty acids, examples include ammonium salts such as alkylammonium salts such as ammonium salts and tetramethylammonium salts, alkaline earth metal salts such as calcium salts and magnesium salts, alkali metal salts such as sodium salts, lithium salts and potassium salts, and metal salts such as cobalt salts and manganese salts, but are not particularly limited as long as they are one or more agriculturally acceptable salts, such as salts contained in fertilizers.

[0053] The unsaturated fatty acids of the present invention (excluding unsaturated oxo fatty acids and unsaturated hydroxylated fatty acids) are not particularly limited, but unsaturated fatty acids with about 10 to 20 carbon atoms may be preferred from the viewpoint of low solubility in water. For example, unsaturated fatty acids with 18 carbon atoms are even more preferred. Furthermore, the number of unsaturated bonds in the molecular structure of the unsaturated fatty acids of the present invention is not limited, and they may be monounsaturated fatty acids or polyunsaturated fatty acids. For example, although not limited to these, examples of unsaturated fatty acids include oleic acid, linoleic acid, alpha-linolenic acid, gamma-linolenic acid, and arachidonic acid. Furthermore, the unsaturated fatty acids may be in the form of free fatty acids or salts thereof (generally usable salts, such as those exemplified above), and one or more of these can be selected. Commercially available products may be used as the unsaturated fatty acids of the present invention, or they may be synthesized from commercially available compounds. Furthermore, one type of unsaturated fatty acid may be used, or two or more types may be used.

[0054] In addition, if isomers exist for the compounds exemplified herein, all possible isomers can be used in the present invention unless otherwise specified.

[0055] The plant fertilizer component absorption enhancer of the present invention comprises at least one unsaturated oxo fatty acid or a derivative thereof or a salt thereof, and preferably further comprises at least one compound selected from at least one hydroxylated fatty acid or a derivative thereof or a salt thereof. More preferably, the plant fertilizer component absorption enhancer of the present invention comprises at least one unsaturated fatty acid (excluding unsaturated oxo fatty acids and unsaturated hydroxylated fatty acids).

[0056] The plant fertilizer component absorption enhancer of the present invention may contain at least one compound selected from at least one oxo fatty acid or its derivative or salt selected from 13-oxoODA and 9-oxoODA, and at least one hydroxylated fatty acid or its derivative or salt selected from 9,10,13-trihydroxy-11-octadecenoic acid and / or 9,12,13-trihydroxy-10-octadecenoic acid, and at least one unsaturated fatty acid selected from oleic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, and arachidonic acid. For example, the plant fertilizer component absorption enhancer of the present invention may contain at least one compound selected from ketooctadecadienoic acid or its derivative or salt selected from hydroxyoctadecenoic acid or its derivative or salt, and at least one unsaturated fatty acid selected from oleic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, and arachidonic acid. For example, the plant fertilizer component absorption enhancer of the present invention may contain 13-oxo-9,11-octadecadienoic acid or its derivatives or salts and linoleic acid, or it may contain 9,10,13-trihydroxy-11-octadecenoic acid and / or 9,12,13-trihydroxy-10-octadecenoic acid or its derivatives or salts and linoleic acid, or it may contain 13-oxo-9,11-octadecadienoic acid and / or 9,10,13-trihydroxy-11-octadecenoic acid and / or 9,12,13-trihydroxy-10-octadecenoic acid or its derivatives or salts and linoleic acid.

[0057] In the present invention, when mixing at least one unsaturated oxo fatty acid or its derivative or salt, at least one hydroxylated fatty acid or its derivative or salt (optionally added), and at least one unsaturated fatty acid (optionally added), it is desirable to use at least one compound selected from the at least one unsaturated oxo fatty acid or its derivative or salt, at least one hydroxylated fatty acid or its derivative or salt, and a stabilizer (emulsifier) ​​to ensure that the at least one unsaturated fatty acid is stably present as an emulsion in water, in order to ensure uniform mixing.

[0058] As the stabilizer (emulsifier), at least one selected from potassium carbonate and dipotassium hydrogen phosphate can be used.

[0059] As described above, the plant fertilizer component absorption enhancer of the present invention contains unsaturated oxo fatty acids or their derivatives or salts, and optionally hydroxylated fatty acids or their derivatives or salts, and optionally unsaturated fatty acids. Since these unsaturated fatty acids and hydroxylated fatty acids can also be found in nature, the plant fertilizer component absorption enhancer of the present invention is excellent in that it has a low environmental impact.

[0060] In the plant fertilizer component absorption enhancer of the present invention, the content ratio of unsaturated oxo fatty acids or their derivatives or salts, and optionally hydroxylated fatty acids or their derivatives or salts, is preferably 1 / 5 to 5 / 1 by weight, and more preferably 1 / 3 to 3 / 1. This is because it exhibits excellent fertilizer absorption promoting effects and plant growth promoting effects.

[0061] It is preferable that, in addition to unsaturated fatty acids, unsaturated oxo fatty acids or their derivatives or salts, and optionally added hydroxylated fatty acids or their derivatives or salts, are contained in the plant fertilizer absorption enhancer of the present invention in an amount of 1% or more by weight. This is because it effectively prevents the washing away of unsaturated oxo fatty acids or their derivatives or salts, and optionally added hydroxylated fatty acids or their derivatives or salts, from the plant fertilizer absorption enhancer.

[0062] The plant fertilizer absorption enhancer of the present invention may optionally contain excipients or carriers. These additives are not particularly limited as long as they are agriculturally acceptable. In addition, components other than excipients and carriers that are commonly used in pesticide formulations may also be included.

[0063] The plant fertilizer absorption enhancer of the present invention can be applied to plants by any method. For example, it can be used as a wettable powder suspended in water, or as a spray applied to the roots of plants. The plant fertilizer absorption enhancer of the present invention may also be used as a immersion agent or a soil drenching agent. Specific application methods can be appropriately selected depending on the cultivated plants and the form of application, but examples include ground liquid application, ground solid application, aerial liquid application, aerial solid application, liquid surface application, application within facilities, soil mixing application, soil drenching application, surface treatment such as coating, application in seedling trays, single flower treatment, and treatment around the base of the plant. Furthermore, the plant fertilizer absorption enhancer of the present invention may be mixed with plant fertilizer components and used as a plant fertilizer.

[0064] The fertilizer components for the aforementioned plants are not limited to any natural or synthetic chemical substances that function as macronutrient and / or micronutrient sources for the plants.

[0065] Macronutrients include at least one selected from the group consisting of nitrogen (N), phosphorus (P), and potassium (K). Micronutrients include at least one selected from the group consisting of calcium (Ca), magnesium (Mg), sulfur (S), zinc (Zn), iron (Fe), manganese (Mn), boron (B), cobalt (Co), molybdenum (Mo), copper (Cu), and nickel (Ni).

[0066] Specifically, the following chemical substances can be used as fertilizer components for the aforementioned plants.

[0067] Examples of nitrogen fertilizers that can be used include ammonium chloride, ammonium sulfate, ammonium nitrate, ammonium dihydrogen phosphate, urea, and lime nitrogen; examples of phosphorus fertilizers that can be used include supercalcium dihydrogen phosphate, superphosphate (a mixture of calcium dihydrogen phosphate and calcium sulfate), dipotassium hydrogen phosphate, and fused phosphate fertilizer; and examples of potassium fertilizers that can be used include potassium nitrate, potassium chloride, potassium sulfate, potassium carbonate, and potassium silicate.

[0068] Examples of magnesium fertilizers include magnesium sulfate and magnesium chloride; examples of calcium fertilizers include quicklime, slaked lime, and calcium carbonate; examples of manganese fertilizers include manganese sulfate, magnesium manganese sulfate, and slag manganese; examples of boron fertilizers include boric acid and borate; examples of iron fertilizers include steel slag; examples of copper fertilizers include copper sulfate; examples of cobalt fertilizers include cobalt nitrate and cobalt sulfate; examples of zinc fertilizers include zinc sulfate, zinc sulfide, and zinc oxide; examples of nickel fertilizers include nickel chloride; examples of molybdenum fertilizers include sodium molybdate; and examples of sulfur fertilizers include sulfurous acid.

[0069] When the plant fertilizer component absorption enhancer of the present invention is used in combination with such plant fertilizer components, it may be applied to the plant using an application method suitable for each fertilizer component.

[0070] The plants to which the plant fertilizer absorption enhancer of the present invention can be applied are not particularly limited, and it can be used effectively on plants in general. For example, it can be suitably applied to plants of the Brassicaceae, Poaceae, Fabaceae, Solanaceae, Rosaceae, Amaranthaceae, or Malvaceae families. Furthermore, the plants to which it can be applied are not limited to wild-type plants, but may also be mutants or transgenic plants, for example. In addition, the varieties of each plant are not particularly limited. [Examples]

[0071] The present invention will be described based on examples, but the present invention is not limited to these examples.

[0072] [Example 1] As an oxo fatty acid or its derivative or salt thereof, 13-oxo-9,11-octadecadienoic acid (13-oxoODA) ((9Z,11E)-13-oxo-9,11-octadecadienoic acid, manufactured by Cayman Chemical Corporation) was used. Furthermore, as a hydroxylated fatty acid or its derivative or salt thereof, a mixture of 9,10,13-trihydroxy-11-octadecenoic acid (manufactured by La Rhodan Fine Chemicals, 9(S),10(S),13(S)-trihydroxy-11(E)-octadecenoic acid (English notation: 9(S),10(S),13(S)-trihydroxy-11(E)-octadecenoic acid)) and 9,12,13-trihydroxy-10-octadecenoic acid (manufactured by La Rhodan Fine Chemicals, 9(S),12(S),13(S)-trihydroxy-10(E)-octadecenoic acid (English notation: 9(S),12(S),13(S)-trihydroxy-10(E)-octadecenoic acid)) in a 2:1 ratio was used. Linoleic acid (primary linoleic acid manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) was used as the unsaturated fatty acid. 1 g of linoleic acid was mixed with 0.09 g of 13-oxoODA, 0.02 g of 9,10,13-trihydroxy-11-octadecenoic acid, 0.01 g of 9,12,13-trihydroxy-10-octadecenoic acid, and 0.5 g of dipotassium hydrogen phosphate. This mixture was dispersed in water to prepare 16 L of aqueous solution (aqueous dispersion) as the stock solution for the fertilizer component absorption enhancer.

[0073] Rice (variety: Nipponbare) seeds were soaked in water for 5 days in an artificial climate chamber (LH-60FL3-DT: manufactured by Nippon Medical Instruments Co., Ltd.) at a temperature of 15°C with the lights off, and then the temperature was raised to 30°C for half a day. The resulting pigeon-breast shaped seeds were sown at a rate of 4 seeds per cell in a 72-cell tray filled with sterilized seed-starting soil (manufactured by Takii Seed Co., Ltd.). The plants were grown in the artificial climate chamber in a daily cycle of 14 hours at a temperature of 28°C with fluorescent lights and 10 hours at a temperature of 23°C with the lights off, until they reached the 1 to 1.5 leaf stage.

[0074] The concentrated fertilizer absorption enhancer solution was diluted 100 times with water and sprayed onto the leaves of 20 rice plants at a rate of 1 mL per plant using a spray bottle, 7 days after sowing.

[0075] Three and 24 hours after spraying, the above-ground parts of five samples were cut from two plants (each sample being two plants), weighed into 15 mL capacity centrifuge tubes with lids (fresh weight: FW), and immediately transferred to a -80°C freezer for 24 hours.

[0076] A mixture of ethanol, water, and acetic acid (80:20:1) was added to the frozen sample to a concentration of 0.1 g / mL. After crushing the beads, sonication was performed for 10 minutes. This mixture was allowed to stand for 1 hour, and then centrifuged at 3000 rpm for 5 minutes using a himac CT6E centrifuge (manufactured by Eppendorf Himac Technologies, Ltd.). The supernatant was filtered through a membrane filter to obtain the analytical sample.

[0077] The analytical samples were analyzed using an LC-MS / MS instrument (LC section: DIONEX Ultimate3000, MS / MS section: Q Exactive Focus: Thermo Fisher Scientific Co., Ltd.) under the following conditions: Column = Aclaim PR-MS 2.1 mmφ × 150 mm (Thermo Fisher Scientific Co., Ltd.), Solvent = 2% acetonitrile / acetic acid solution → 95% acetonitrile / acetic acid solution, Flow rate = 0.25 mL / min, Column temperature = 40°C, Detection = MS-(SIM), Introduction = 2 μL of sample solution. Auxin was calculated using a calibration curve prepared with analytical values ​​using 3-indoleacetic acid (first-grade reagent manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.), and quantified from the peak area value of MS-. The auxin content in the rice samples 3 hours after application of the fertilizer component absorption accelerator was 4.7 ng / gFW, and the auxin content in the rice samples 24 hours later was 5.9 ng / gFW.

[0078] [Comparative Example 1] Similar to Example 1, 20 rice plants, grown 7 days after sowing, were sprayed with 1 mL of water per plant using a spray bottle.

[0079] Samples were collected, extracted, and analyzed in the same manner as in Example 1, and the amount of auxin contained was quantified. The results showed that the auxin content in the rice sample 3 hours after watering was 3.9 ng / gFW, and the auxin content in the rice sample 24 hours later was 3.8 ng / gFW.

[0080] [Example 2] A concentrate of the fertilizer component absorption enhancer was prepared in the same manner as in Example 1.

[0081] A solution of fertilizer absorption enhancer was diluted 50 times with water. 21.4g of urea, 13.4g of potassium chloride, and 44.9g of dipotassium hydrogen phosphate (N:P:K=10:8:27) were dissolved in 1L of water and then further diluted 3000 times with water (Solution B). 100mL of Solution A and 100mL of Solution B were mixed and sprayed 1mL per plant onto the leaves of 20 rice plants 7 days after sowing using a spray bottle.

[0082] Samples were collected, extracted, and analyzed in the same manner as in Example 1, and the amount of auxin contained was quantified. The results showed that the auxin content in the rice sample 3 hours after watering was 6.6 ng / gFW, and the auxin content in the rice sample 24 hours later was 7.6 ng / gFW.

[0083] [Comparative Example 2] 50 mg of stearic acid (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) and 150 mg of polyoxyethylene (20) sorbitan monooleate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) were dispersed in water to prepare a 1 L aqueous solution (aqueous dispersion) as a comparison solution.

[0084] Rice seeds were sown in the same manner as in Example 1, and the plants were grown in an artificial climate chamber with a daily cycle of 14 hours at 28°C under fluorescent lights and 10 hours at 23°C with the lights off. The comparative solution was then sprayed.

[0085] Samples were collected, extracted, and analyzed in the same manner as in Example 1, and the amount of auxin contained was quantified. The results showed that the auxin content in the rice sample 3 hours after watering was 3.0 ng / gFW, and the auxin content in the rice sample 24 hours later was 3.1 ng / gFW.

[0086] [Table 1]

[0087] As shown in Table 1, it was found that spraying the fertilizer component absorption enhancer of the present invention increased the auxin content in plants. Therefore, it is thought that in plants treated with the fertilizer component absorption enhancer, the absorption of fertilizer components such as potassium is promoted through the activation of cell membrane proton pumps by auxin, thereby inducing plant elongation growth. On the other hand, in Comparative Example 1, where only water was sprayed, and in Comparative Example 2, where a comparative solution containing stearic acid, a linear saturated fatty acid, was sprayed, no increase in auxin content was observed in the treated plants. In Example 2, where the fertilizer component absorption enhancer of the present invention was applied together with commercially available fertilizer components, the auxin content in the plants was further increased. Therefore, by using the fertilizer component absorption enhancer of the present invention together with plant fertilizer components, it is possible to provide a plant fertilizer with an excellent plant growth promoting effect and enhanced fertilizer component absorption efficiency.

Claims

1. A plant fertilizer component absorption enhancer comprising an unsaturated oxo fatty acid or a salt thereof, and an unsaturated hydroxylated fatty acid or a salt thereof, The aforementioned unsaturated oxo fatty acid is 13-oxo-9,11-octadecadienoic acid, The aforementioned unsaturated hydroxylated fatty acid is 9,10,13-trihydroxy-11-octadecenoic acid or 9,12,13-trihydroxy-10-octadecenoic acid, The fertilizer components of the aforementioned plants are nitrogen, phosphorus, or potassium. The aforementioned fertilizer component absorption enhancer is a liquid plant fertilizer component absorption enhancer.

2. The plant fertilizer component absorption accelerator according to claim 1, further comprising a monounsaturated or polyunsaturated fatty acid selected from the group consisting of oleic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, and arachidonic acid.

3. The plant fertilizer component absorption enhancer according to claim 2, wherein the unsaturated fatty acid is linoleic acid.

4. A plant fertilizer component absorption enhancer according to any one of claims 1 to 3, and a plant fertilizer containing the plant fertilizer component.

5. The plant fertilizer component absorption accelerator is the plant fertilizer component absorption accelerator according to any one of claims 1 to 3, wherein the plant fertilizer component absorption accelerator comprises water.

Images