Soil conditioner and soil improving material

Abstract

To provide a soil conditioner capable of efficiently producing compost, gradation fertilizer or fermented feed capable of soundly cultivating plants such as field crops and ornamental plants by applying it to soil or especially mixing it with organic waste, and to provide a soil conditioner capable of efficiently conditioning soil so as to soundly cultivate plants such as field crops and ornamental plants.SOLUTION: A soil improvement agent, which is a mixture of rice bran and skin bran obtained by wash-free rice processing, wherein a content (mg / 100g) of phytic acid in a calculated dried weight (weight of components excluding water) and 0% of water and fat excluding fat exceeds 7133 (mg / 100g) that is a theoretical content of phytic acid in rice bran in which calculated water and fat are 0%.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a soil conditioner and soil improvement material that can be used as fertilizer or feed, and more specifically to a soil conditioner for converting organic waste such as fallen leaves, straw, grass clippings, vegetable harvest residues, food waste, and pruned branch and leaf waste into compost, bokashi fertilizer, or fermented feed, and a soil improvement material obtained using the soil conditioner. [Background technology]

[0002] Conventionally, organic waste has been decomposed by microbial fermentation, and the fermented products have been used as fertilizers, soil conditioners, etc. It is known to use rice bran in combination with such fermentation agents as a nutrient source for the microorganisms.

[0003] Even without using the fermentation agents mentioned above, organic waste will ferment, decompose, and mature if left as is, but this takes an extremely long time. Furthermore, the fermentation agents mentioned above are microorganisms added to a carrier such as waste medium or sawdust. If only nutrient sources such as rice bran are used without adding microorganisms as fermentation agents, the organic waste will need to be accumulated for a long period of time to be fermented. Furthermore, while it has been customary to spread rice water or bran generated during the rice milling process on fields or plow it into the soil as fertilizer, this only achieves the fertilizer effect of the rice bran itself.

[0004] Therefore, the present applicant has developed a fermentation promoter for organic waste that can ferment organic waste in an extremely short period of time without the need to add microorganisms as fermenting agents, and that allows the treated product to be effectively used as fertilizer, soil conditioner, etc. The fermentation promoter for organic waste is made from bran that is generated in the final step of the milling process, bran that is generated in the rice polishing process in which polished rice after polishing brown rice is further polished, or bran that is generated in the process of washing polished rice before cooking or the process of processing polished rice into no-wash rice that can be cooked without washing, and that mainly contains aleurone layer cells and the underlying endosperm portion of rice seeds (Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4529224 specification Summary of the Invention [Problem to be solved by the invention]

[0006] As described in Patent Document 1, the inventors were aware that mixing specific rice bran with various organic wastes generated in daily life would promote fermentation. However, although paragraph

[0006] states that "we discovered that this is extremely effective in activating and promoting the proliferation of soil microorganisms such as mold and bacteria," there is no consideration of the case of decay that has a negative impact on soil and crops. Most molds are aerobic bacteria, and the proliferation of mold in rice is called rot. Furthermore, paragraph

[0006]

[0007] It is stated in the manual that "the moisture content should be adjusted as necessary to reach a moisture content of 60-65%", but the moisture content of compost and bokashi fertilizer is 20-50%, preferably 30-40%. Excessive moisture makes it easier for bacteria to grow and causes decay. Therefore, decay, including decay, is a fermented product obtained by activating and promoting the growth of soil microorganisms, and the effectiveness of the compost, bokashi fertilizer, or fermented feed obtained through fermentation was unknown.

[0007] Therefore, an object of the present invention is to provide a soil conditioner that can be applied to soil, or in particular mixed with organic waste, to efficiently produce compost, bokashi fertilizer, or fermented feed that can be used to grow crops, ornamental plants, and other plants in a healthy manner. Another object of the present invention is to provide a soil improvement material that can efficiently improve soil so that plants such as agricultural crops and ornamental plants can be grown healthily. [Means for solving the problem]

[0008] After extensive research, the inventors focused on the phytic acid contained in rice bran and discovered that by mixing rice bran with "skin bran" obtained from a specific step in the rice milling process, a soil conditioner with an increased phytic acid content can be produced, which can be used to produce compost and liquid fertilizer that are effective for growing healthy crops, as well as fermented feed that is effective for raising livestock and pets, and thus completed the present invention.

[0009] That is, the first aspect of the present invention is It is a mixture of rice bran and skin bran obtained by processing rice without washing. The present invention relates to a soil conditioner characterized in that the phytic acid content (mg / 100g) calculated by the following formula 1 in a dry weight (weight of components excluding water) and excluding lipids, with a moisture and lipid content of 0%, exceeds 7,133 (mg / 100g), which is the theoretical phytic acid content in rice bran with a moisture and lipid content of 0%, calculated by the following formula 2: <Calculation formula> Phytic acid content (mg / 100g) when moisture and fat are 0% = [phytic acid content (mg / 100g)] ÷ (100 - [moisture content (g / 100g)] - [fat content (g / 100g)]) × 100 (Formula 1) (In the formula, the phytic acid content, water content, and lipid content are analytical values.) Theoretical content of phytic acid in rice bran with 0% moisture and lipids (mg / 100g) = 5,000 (mg / 100g) ÷ (100 - 10.3 (g / 100g) - 19.6 (g / 100g)) × 100 = 7,133 (Equation 2)

[0010] The soil conditioner may be adjusted so that the phosphorus content (mg / 100g), potassium content (mg / 100g), and magnesium content (mg / 100g) of the dry weight (weight of components excluding water) and excluding lipids, calculated using the following formula 3, when the moisture and lipid content is 0%, exceed 2,853, 2,140, ​​and 1,213, respectively, which are the theoretical contents in rice bran when the moisture and lipid content is 0%, calculated using the following formula 4. <Calculation formula> Phosphorus content (mg / 100g), potassium content (mg / 100g), or magnesium content (mg / 100g) when moisture and fat are 0% = [Phosphorus content (mg / 100g), potassium content (mg / 100g), or magnesium content (mg / 100g)] ÷ (100 - [Moisture content (g / 100g)] - [Fat content (g / 100g)]) × 100 (Equation 3) (In the formula, the phosphorus content, potassium content, magnesium content, water content, and lipid content are analytical values.) Phosphorus: Theoretical phosphorus content in rice bran with 0% water and lipids (mg / 100g) = 2,000 (mg / 100g) ÷ (100 - 10.3 (g / 100g) - 19.6 (g / 100g)) × 100 = 2,853 Potassium: Theoretical content of potassium in rice bran with 0% water and lipids (mg / 100g) = 1,500 (mg / 100g) ÷ (100 - 10.3 (g / 100g) - 19.6 (g / 100g)) × 100 = 2,140 Magnesium: Theoretical content of magnesium in rice bran with 0% water and fat (mg / 100g) = 850 (mg / 100g) ÷ (100 - 10.3 (g / 100g) - 19.6 (g / 100g)) × 100 = 1,213 (Equation 4)

[0011] The bran may be in the form of thick rinse water.

[0012] A second aspect of the present invention relates to the soil improvement material, wherein the soil improvement material is substantially sealed in a container.

[0013] The soil improvement material may have a moisture content adjusted to 20% to 50%.

[0014] The soil conditioner may be a lactic acid fermented bokashi fertilizer or fermented feed.

[0015] In the present invention, a soil conditioner is a product that improves the quality of soil and promotes plant growth, and in particular, a product that can be mixed with organic waste to promote the production of compost, bokashi fertilizer, or fermented feed. Soil conditioners are materials that, when applied to soil, can increase the nutrients and microorganisms in the soil, creating soil suitable for the healthy cultivation of agricultural crops and ornamental plants. [Effects of the Invention]

[0016] By applying the soil conditioner of the present invention to soil, or in particular by mixing it with organic waste, it is possible to produce compost, bokashi fertilizer, or fermented feed that is suitable for the healthy cultivation and raising of plants such as agricultural crops and ornamental plants, and animals such as livestock and pets. Furthermore, by applying the soil improvement material of the present invention to fields such as rice paddies and farmland, cultivation pots, etc., agricultural crops and ornamental plants can be cultivated in a healthy manner. Furthermore, unlike cases where rice bran obtained in the rice milling process is reused as fertilizer, etc., the bran obtained in the no-wash rice process and the thick rinse water in which the bran is mixed with water are prone to oxidation and putrefaction, and large costs are incurred for disposal and prevention of oxidation. However, by using the bran as a raw material for soil conditioners in this invention, the bran can be used effectively, and soil conditioners such as compost and bokashi fertilizer, which are usually made by procuring fermentation accelerators separately from outside, can be made using only by-products generated within the rice milling factory (such as bran, rice bran, broken rice, and foreign matter such as colored grains), so they can be produced extremely cheaply.In addition, compost, bokashi fertilizer, fermented feed, etc. can be produced in a shorter time than with conventional rice bran. Furthermore, by using the resulting compost, bokashi fertilizer, etc. mixed into soil as a soil improvement agent, it can be applied to fields where organic matter (organic waste) such as rice straw has been plowed, and mixed with the organic matter, promoting the decomposition (fermentation) of the organic matter, fermenting the entire field, and cultivating healthy crops and ornamental plants in this area, making it possible to obtain healthy, high-quality crops and ornamental plants. Furthermore, because the fermented feed is rich in lactic acid bacteria, it can be mixed with feed for livestock animals such as chickens, cows, horses, pigs, sheep, and goats, or with feed for pets such as dogs, cats, mice, and rats, to create a favorable intestinal environment and contribute to healthy growth. DETAILED DESCRIPTION OF THE INVENTION

[0017] (soil conditioner) The soil conditioner of the present invention is a mixture of rice bran obtained by no-wash rice processing and rice bran, The phytic acid content (mg / 100g) calculated by the following formula 1 for a dry weight (weight of components excluding water) and a water / lipid content of 0% excluding lipids exceeds 7,133 (mg / 100g), which is the theoretical content of phytic acid in rice bran with a water / lipid content of 0% calculated by the following formula 2. <Calculation formula> Phytic acid content (mg / 100g) when moisture and fat are 0% = [phytic acid content (mg / 100g)] ÷ (100 - [moisture content (g / 100g)] - [fat content (g / 100g)]) × 100 (Formula 1) (In the formula, the phytic acid content, water content, and lipid content are analytical values.) Theoretical content of phytic acid in rice bran with 0% moisture and lipids (mg / 100g) = 5,000 (mg / 100g) ÷ (100 - 10.3 (g / 100g) - 19.6 (g / 100g)) × 100 = 7,133 (Equation 2)

[0018] In the present invention, the term "wash-free rice processing" refers to a process for producing wash-free rice using polished rice obtained by polishing brown rice in a rice polishing process as a raw material. Methods of no-wash rice processing include dry polishing, water washing, BG rice polishing, and foreign matter mixing. Dry polishing is a method of removing the bran from the rice by rubbing it with a brush, nonwoven fabric, or polishing machine. The water washing method is a method of washing and drying rice in an extremely short time, and washing away the rice bran with water. The BG rice polishing method uses the adhesive power of the bran to attach the bran adhering to the surface of the rice grain to other bran particles and remove it; sometimes a small amount of water is added to make the bran easier to remove. The foreign matter mixing method is essentially the same as the water washing method, but it reduces the amount of water added to the polished rice, and in order to remove the thick, viscous washing water that clings to the polished rice after the rice washing process, it mixes and stirs in small particles of tapioca starch or rice flour, which allows the rice to be wiped clean of the washing water (bran) from the surface of the polished rice grains.

[0019] In the present invention, the bran produced during the no-wash rice processing refers to the bran that has been peeled off by the rice polisher and reattached to the surface of the polished rice. Therefore, skin bran is different from rice bran obtained in the normal manufacturing process of polished rice. The bran is obtained in the no-wash rice process, and in the case of the water-washing method, it is obtained in the form of concentrated rinse water dissolved in water. The concentrated rinse water may be the liquid obtained from the no-wash rice process, or may be dried after being dehydrated. In the case of the dry polishing type, BG rice polishing drying type or foreign matter mixing type, the obtained bran may be mixed with water to make a thick rinse water having an appropriate viscosity. The water content of the rinse water obtained by washing polished rice at home (polishing and washing) is 99.9% to 99.6%, whereas the water content of the bran produced in no-wash rice processing is approximately 10%. In the case of thick rinse water containing bran, the water content is around 80%, making it a thick rinse water with a high solid content.

[0020] Furthermore, as a result of research by the present inventors, it has been found that skin bran has a significantly higher initial fermentation ability than rice bran. From this, it is thought that skin bran is ground more finely than rice bran and contains a higher content of phytic acid and lactic acid bacteria, and therefore when mixed with rice bran, the initial fermentation ability becomes significantly higher.

[0021] In the present invention, the rice bran may be bran obtained in the manufacturing process of ordinary polished rice or polished rice. There is no limitation on the degree of polishing of the polished rice. Furthermore, the rice bran may be defatted rice bran (rice bran from which rice oil has been extracted).

[0022] The soil conditioner of the present invention is a mixture of the above-mentioned rice bran and the above-mentioned rice bran, and the content of phytic acid has been adjusted to be higher than that of ordinary rice bran.

[0023] Phytic acid, known as inositol hexaphosphate, is known as the main storage form of phosphorus present in plant tissues. When the phytic acid content of rice bran discharged daily from the rice milling factory at Toyo Rice Co., Ltd.'s Wakayama headquarters was measured, it was found that up to 5,000 mg of phytic acid was contained in 100 g of rice bran.

[0024] Specifically, the phytic acid content (mg / 100g) in the soil conditioner calculated from the above formula 1 on a dry weight basis (weight of components excluding water) and excluding lipids, with a moisture and lipid content of 0%, is adjusted to exceed 7,133 (mg / 100g), which is the theoretical phytic acid content in rice bran with a moisture and lipid content of 0% as calculated from the above formula 2, and is preferably adjusted to 10,000 (mg / 100g) or more, and more preferably 12,500 (mg / 100g) or more.

[0025] In the above formula 1, the theoretical content of phytic acid, 5,000 mg / 100 g, is the maximum measured phytic acid content of rice bran discharged daily from rice milling factories, and the moisture content of 10.3 g / 100 g and lipid content of 19.6 g / 100 g are the contents listed for "Rice Bran" in the Standard Tables of Food Composition in Japan (8th Edition), Supplementary Edition, 2023.

[0026] Since the phytic acid content in the skin bran is higher than that in rice bran, it is believed that the soil conditioner of the present invention, which is a mixture of skin bran and rice bran, has been adjusted so that the phytic acid content (mg / 100g) per dry weight and weight excluding lipids exceeds the theoretical content of phytic acid in rice bran. The content (analytical value) of phytic acid in the soil conditioner of the present invention or in rice bran can be measured using the phytic acid (total phosphate) analysis kit described in the Examples below.

[0027] It has been confirmed that the soil conditioner of the present invention, which contains rice bran and rice bran, has a higher fermentation ability when mixed with organic waste than when rice bran is used alone. From this, it is believed that in compost, bokashi fertilizer, fermented feed, etc. using the soil conditioner of the present invention, the fermentation of the contained organic raw materials is promoted by the progress of lactic acid fermentation, etc., and that plants such as agricultural crops and ornamental plants, and animals such as livestock and pets, can quickly absorb nutrients and enable healthy growth and development.

[0028] Furthermore, the soil conditioner of the present invention may be adjusted so that the phosphorus content (mg / 100g), potassium content (mg / 100g), and magnesium content (mg / 100g) calculated by the dry weight (weight of components excluding water) and excluding lipids, when the moisture and lipid content is 0%, as calculated by the above formula 3, exceed the theoretical contents of 2,853, 2,140, ​​and 1,213, respectively, in rice bran when the moisture and lipid content is 0% as calculated by the above formula 4.

[0029] In addition, the theoretical contents of phosphorus (2,000 mg / 100 g), potassium (1,500 mg / 100 g), magnesium (850 mg / 100 g), water and lipids used in formula 4 are the contents listed for "rice bran" in the Standard Tables of Food Composition in Japan (8th edition), supplemented in 2023.

[0030] Since the phosphorus, potassium, and magnesium contents in skin bran are higher than those in rice bran, it is believed that the phosphorus, potassium, and magnesium contents (mg / 100g) per dry weight and weight excluding lipids of the soil conditioner of the present invention, which is a mixture of skin bran and rice bran, exceed the theoretical contents of phosphorus, potassium, and magnesium in rice bran. Trace elements such as phosphorus, potassium and magnesium are components that are utilized in microbial fermentation, and are therefore thought to be one of the factors that contribute to the high fermentation ability of the soil conditioner of the present invention on organic waste. The contents (analytical values) of phosphorus, potassium and magnesium in the soil conditioner of the present invention can be measured by the method described in the Examples below.

[0031] The content of bran and rice bran in the soil conditioner of the present invention is not necessarily determined depending on the water content when the bran is thick rinse water, but may be, for example, 70% to 85%.

[0032] The soil conditioner of the present invention can be produced by mixing the above-mentioned bran and rice bran. For example, in no-wash rice factories, brown rice is polished and the polished rice obtained is then processed to produce no-wash rice.The rice bran obtained by polishing brown rice and the bran (thick rice-washing water) obtained by processing the no-wash rice are collected and mixed in a mixing device to produce a soil conditioner. The mixing device is preferably equipped with a means for stirring the rice bran, which is a solid content. Although there are no particular limitations on the conditions for stirring in the mixing device, stirring is preferably carried out at 60°C or less in order to suppress decomposition of phytic acid and maintain the content.

[0033] Furthermore, in order to regulate the fermentation of rice bran during storage, it is preferable to adjust the water content of the soil conditioner of the present invention to 20 to 50% by weight.

[0034] (soil improvement material) The soil improvement material of the present invention is the soil improvement agent that is substantially sealed in a container. By being approximately sealed in a container such as the above, fermentation by microorganisms such as lactic acid bacteria in the soil conditioner can be promoted while suppressing the growth of mold and other germs, thereby achieving a favorable soil improvement effect.

[0035] The material of the container may be any material that can maintain the moisture content of the soil conditioner, such as resins such as polyethylene (PE) and polypropylene (PP), laminated materials made of multiple resins, and paper materials with a water-repellent coating, but is not particularly limited. The shape of the container is not particularly limited as long as it can be sealed so that the soil improvement material contained therein does not leak out, and examples thereof include a bag shape, a box shape, etc. The sealing method is not particularly limited and can be selected appropriately depending on the material and shape of the container.

[0036] The container may be provided with one or more gas vent holes for releasing gas generated during lactic acid fermentation in the soil conditioner to the outside. The shape and size of the gas vent hole are not particularly limited, but may be, for example, a hole of about the size of a hole made with a syringe needle (diameter of about 0.5 mm (diameter of 1 mm or less)). The position of the gas vent hole in the container is not particularly limited as long as it is a position that allows gas to escape easily.

[0037] The soil conditioner of the present invention may contain, in addition to the soil conditioner, organic materials such as charcoal, such as rice husk charcoal. The content of the organic material is preferably adjusted to 10 to 40 parts by weight per 100 parts by weight of the soil conditioner, from the viewpoint of ensuring water retention and breathability and the carbon source also serving as a nutrient source for microorganisms.

[0038] The soil conditioner of the present invention may also be a liquid fertilizer or fermented feed obtained by mixing the soil conditioner with an organic material and subjecting the mixture to lactic acid fermentation for a predetermined period of time. When the soil improvement material of the present invention is a fermented feed that has been lactic acid fermented, the user can use it as a fertilizer by opening the container and mixing the soil improvement material with soil. When the soil improvement material of the present invention is a fermented feed, after opening the container, the user can mix the soil improvement material with organic matter such as straw or hay to produce feed for livestock animals such as cows, horses, pigs, sheep, goats, etc. Furthermore, by mixing it with commercially available feed, it can be used as feed for birds such as chickens and pets.

[0039] The moisture content of the soil improvement material of the present invention is preferably adjusted to 20 to 50% from the viewpoint of preventing the temperature from rising and causing rot, and from the viewpoint of ensuring breathability. The moisture content can be measured using a normal pressure or reduced pressure heat drying type moisture meter (for example, MX-50 manufactured by A&D Co., Ltd.).

[0040] The soil improvement material of the present invention can be produced by filling a predetermined amount of the soil improvement agent into the container and sealing it. The method of filling and sealing may be appropriately selected depending on the shape, size, etc. of the container, and is not particularly limited. [Example]

[0041] (Example 1: Preparation of soil conditioner) In a no-wash rice processing device at Toyo Rice Co., Ltd.'s Wakayama headquarters factory, 900 g of rice bran obtained from the rice polishing process was mixed with 100 g of rice bran obtained from the no-wash rice process (rice bran with water added to make thick rice rinse water) to produce a soil conditioner (moisture content 30-50%).

[0042] The phytic acid content of the resulting soil conditioner was measured using a phytic acid (total phosphate) analysis kit (K-PHYT, manufactured by Megazyme) according to the following procedure, and was found to be 6,300 mg / 100 g, with a moisture content of 35% (35 g / 100 g) and a lipid content of 15.3 g / 100 g (measured by the Soxhlet extraction method or acid hydrolysis method at the Food Analysis Center, a general incorporated foundation). Using the following formula 1, the phytic acid content (mg / 100 g) based on the dry weight (weight of components excluding water) and excluding lipids, with a moisture and lipid content of 0%, was calculated to be 12,676 mg / 100 g, which is higher than the theoretical content of 7,133 mg / 100 g. The method and procedure for quantifying the phytic acid content is not limited to this, and any method and procedure that allows for the quantitative determination of the phytic acid content, such as high performance liquid chromatography, may be used.

[0043] <Calculation formula> Phytic acid content (mg / 100g) when moisture and fat are 0% = [phytic acid content (mg / 100g)] ÷ (100 - [moisture content (mg / 100g)] - [fat content (mg / 100g)]) × 100 (Formula 1) (In the formula, the phytic acid content, water content, and lipid content are analytical values.)

[0044] (Analysis Procedure) 100 mL of 0.66 M hydrochloric acid was added to 1 g of sample, the beaker was covered with aluminum foil, and the mixture was stirred at room temperature for 3 hours. 1 mL of the mixture was then transferred to a 15 mL centrifuge tube and centrifuged at 3,500 rpm for 10 minutes. 0.5 mL of the supernatant was mixed with 0.5 mL of 0.75 M sodium hydroxide solution to obtain the sample extract.

[0045] In order to analyze the free phosphorus and total phosphorus contents in the sample extract, the sample extract was mixed with the test reagent solutions (Solution 1, Suspension 2, Solution 3, Suspension 4, Solution 5) included in the analysis kit and reacted in stages, based on the analytical procedure using an enzymatic dephosphorylation reaction described in the instruction manual included with the analysis kit.

[0046] Table 1 shows the composition used in the first reaction, and Table 2 shows the composition used in the second reaction. The reaction conditions for the first step were 40°C for 10 minutes, and the reaction conditions for the second step were 40°C for 15 minutes.

[0047] [Table 1]

[0048] [Table 2]

[0049] After the second-stage reaction, 0.30 mL of trichloroacetic acid (50% w / v) was added to each of analytical solutions 1 and 2, and the mixture was centrifuged at 3,500 rpm for 10 minutes. 0.5 mL of color-developing reagent was added to 1 mL of the supernatant and mixed using a vortex mixer. The mixture was allowed to react at 40°C for 1 hour, after which the mixture was stirred and the absorbance at 655 nm was measured.

[0050] The color reagent was prepared by mixing 5 parts by weight of 10% w / v ascorbic acid / 1M sulfuric acid solution A and 1 part by weight of 5% w / v ammonium molybdate solution B.

[0051] To perform colorimetric determination, phosphorus standard solutions 0 to 4 were prepared at the concentrations shown in Table 3 below. 0.5 mL of color-developing reagent was added to 1 mL of each phosphorus standard solution, mixed using a vortex mixer, and incubated at 40°C for 1 hour. After stirring, the absorbance at 655 nm was measured. The absorbance of standard 0 (blank) was subtracted from the absorbance of standards 1 to 4 to obtain the ΔA 標準n was calculated and a calibration curve for the phosphorus standard solution was created.

[0052] [Table 3]

[0053] Using the absorbance and the phosphorus standard solution calibration curve, the free phosphorus content in analysis solution 1 and the total phosphorus content in analysis solution 1 were calculated using the following calculation formula. The free phosphorus content was excluded from the total phosphorus content to calculate the phosphorus content (= total phosphorus content - free phosphorus content). The phytic acid content was then calculated from the obtained phosphorus content. M 標準n = Phosphorus (μg) / ΔA 標準n [(μg) / ΔA] Average M=(M 標準1 ~M 標準4 (sum of (μg) / 4[(μg) / ΔA] Phosphorus content = (average M × 100 × 55.6) / (10,000 × 1.0 × 1.0) × ΔA [g / 100g] =0.556×Average M×ΔA[g / 100g] Phytic acid content = Phosphorus content [g / 100g] / 0.282 [g / 100g] ΔA: absorbance difference of the sample Average M: Average value calculated from the phosphorus standard solution calibration curve (μg / ΔA)

[0054] The phosphorus content (mg / 100g), potassium content (mg / 100g), and magnesium content (mg / 100g) in the obtained soil conditioner were measured by the Food Analysis Center using atomic absorption spectrometry and ICP atomic emission spectrometry. The phosphorus content was 1,600mg / 100g, the potassium content was 1,200mg / 100g, and the magnesium content was 700mg / 100g. The dry weight (weight of components excluding water) calculated using the following formula 3 and the moisture and lipid content excluding lipids were 0%. Phosphorus content: 3,219 mg / 100 g (theoretical phosphorus content: 2,853 mg / 100 g) Potassium content is 2,505mg / 100g (theoretical potassium content: 2,140mg / 100g) Magnesium content: 1,408 mg / 100 g (theoretical magnesium content: 1,213 mg / 100 g) All of these values ​​were higher than the theoretical content. <Calculation formula> Phosphorus content (mg / 100g), potassium content (mg / 100g), or magnesium content (mg / 100g) when moisture and fat are 0% = [Phosphorus content (mg / 100g), potassium content (mg / 100g), or magnesium content (mg / 100g)] ÷ (100 - [Moisture content (g / 100g)] - [Fat content (g / 100g)]) × 100 (Equation 3) (In the formula, the phosphorus content, potassium content, magnesium content, water content, and lipid content are analytical values.)

[0055] The soil conditioner was stored at 37°C, and the number of lactic acid bacteria was measured over time using MRS agar medium (de Man, Rogosa, Sharpe). The yellowness index was measured using a spectrophotometer / colorimeter (SE7700, Nippon Denshoku Industries Co., Ltd.) as an indicator of the maturity of the fertilizer (effectiveness as a fertilizer). The higher the yellowness, the more effective the soil is as a compost fertilizer. As a control, a comparative product was used in which water was added to the rice bran to bring the moisture content to 30%.

[0056] The soil conditioner had a lactic acid bacteria count of 10 on the first day. 5 pcs / g, and after 4 days it was 10 7 ~10 9 It became 1 / g. On the other hand, the comparison product had 10% lactic acid bacteria on the first day. 2 pcs / g, and after 4 days it was 10 5 It became 1 / g. Therefore, the soil conditioner contained nearly 1,000 times more lactic acid bacteria than the control product, and after four days of lactic acid fermentation, the amount was nearly 100 to 10,000 times more. This shows that the soil conditioner of the present invention has a high content of lactic acid bacteria and a very high initial lactic acid fermentation ability.

[0057] Regarding yellowness, the soil conditioner had a yellowness index of 62.5 on the first day and 78.3 after four days (an increase of 15.8). On the other hand, the yellowness index of the comparative product was 63.2 on the first day and increased to 64.1 after four days (an increase of 0.9 in yellowness index). Therefore, it can be seen that the soil conditioner of the present invention has a much higher initial lactic acid fermentation ability than the comparative product, and therefore can be quickly converted into compost, liquid fertilizer, or fermented feed. For example, when the soil conditioner of the present invention is mixed with other organic materials, it quickly turns into compost or bokashi fertilizer, and compost or bokashi fertilizer can be produced stably without being affected by decay due to the proliferation of other bacteria. Furthermore, by mixing the soil conditioner of the present invention with animal feed for livestock, pets, and other animals, the content of useful microorganisms such as lactic acid bacteria can be increased, making it possible to stably produce fermented feed that is suitable for the healthy growth of the animals.

[0058] (Example 2: Effect on vegetables) In the wash-free rice processing equipment at Toyo Rice Co., Ltd.'s Wakayama headquarters factory, 9,000 g of rice bran obtained from the rice milling process was mixed with 1,000 g of rice bran (thickened rice rinse water obtained by adding water to rice bran) obtained from the wash-free rice process to produce a soil conditioner (moisture content 30-50%).

[0059] From August to December 2023, conventionally grown lettuce plants were harvested in a field in Wakayama Prefecture. Additionally, lettuce plants were fertilized with the soil conditioner prepared in Example 1 at a rate of 1,000 g per 3.3 m² (1 tsubo) 10 days before planting and thoroughly mixed with the soil. After harvest, the plants were left at 15°C. The harvest date was counted as Day 1, and the weight (deterioration due to water leakage) and leaf color (yellowing due to deterioration) were measured on Days 4, 6, 8, 11, 13, and 22. The weight was measured using a commercially available scale, and the weight change rate from the harvest date (Day 1) was calculated. Leaf color was measured using a spectrophotometer / colorimeter (SE7700, manufactured by Nippon Denshoku Industries Co., Ltd.). The weight results are shown in Table 4, and the yellowness results are shown in Table 5. Regarding leaf color, the upper limit was set at a yellowness index of 59, and further measurement was stopped if the upper limit was exceeded.

[0060] [Table 4]

[0061] [Table 5]

[0062] From the results shown in Table 4, the lettuce grown with the soil conditioner prepared in Example 1 as fertilizer showed a significantly slower weight change than the lettuce grown under conventional cultivation. Furthermore, the results shown in Table 5 show that the yellowness index of lettuce grown using conventional cultivation exceeded 59 on the 11th day after harvest, whereas the yellowness index of lettuce grown using the soil conditioner prepared in Example 1 did not exceed 59 even on the 22nd day after harvest. This indicates that the change in leaf color was significantly slower than that of lettuce grown using conventional cultivation. Furthermore, when the condition of the lettuce was visually observed, it was found that although some parts of the lettuce grown with the soil conditioner prepared in Example 1 had wilted and turned light brown 22 days after harvest, the other parts remained green. On the other hand, lettuce grown using conventional cultivation showed large black discolored areas on the surface eight days after harvest, and by the 13th day the black discolored areas had increased and some parts had rotted, revealing the inside of the lettuce. By the 22nd day the rot had spread throughout the lettuce and it had clearly shrunk in size. Therefore, the lettuce grown using the soil conditioner prepared in Example 1 as fertilizer was a high-quality vegetable with an excellent shelf life.

Claims

1. It is a mixture of rice bran and skin bran obtained by processing rice without washing. A soil conditioner characterized in that the phytic acid content (mg / 100g) calculated from the following formula 1 in a dry weight (weight of components excluding water) and with 0% moisture and lipids excluding lipids exceeds 7,133 (mg / 100g), which is the theoretical content of phytic acid in rice bran with 0% moisture and lipids calculated from the following formula 2. <Calculation formula> Phytic acid content (mg / 100g) when moisture and fat are 0% = [phytic acid content (mg / 100g)] ÷ (100 - [moisture content (g / 100g)] - [fat content (g / 100g)]) × 100 (Formula 1) (In the formula, the phytic acid content, water content, and lipid content are analytical values.) Theoretical content of phytic acid in rice bran with 0% moisture and 0% fat (mg / 100g) = 5,000 (mg / 100g) ÷ (100 - 10.3 (g / 100g) - 19.6 (g / 100g)) × 100 = 7,133 (Equation 2)

2. The dry weight (weight of components excluding water) calculated from the following formula 3 and the moisture and lipid content excluding lipids are 0%. The phosphorus content (mg / 100g), potassium content (mg / 100g) and magnesium content (mg / 100g) are calculated from the following formula 4. The soil conditioner according to claim 1, wherein the theoretical contents in rice bran with a moisture and lipid content of 0% are 2,853, 2,140 and 1,213, respectively. <Calculation formula> Phosphorus content (mg / 100g) or potassium content (mg / 100g) or magnesium content (mg / 100g) when moisture and fat are 0% = [Phosphorus content (mg / 100g) or potassium content (mg / 100g) or magnesium content (mg / 100g)] ÷ (100 - [Moisture content (g / 100g)] - [Fat content (g / 100g)]) × 100 (Equation 3) (The phosphorus content, potassium content, magnesium content, moisture content, and lipid content are analytical values.) Phosphorus: Theoretical phosphorus content in rice bran with 0% water and lipids (mg / 100g) = 2,000 (mg / 100g) ÷ (100 - 10.3 (g / 100g) - 19.6 (g / 100g)) x 100 = 2,853 Potassium: Theoretical content of potassium in rice bran with 0% water and lipids (mg / 100g) = 1,500 (mg / 100g) ÷ (100 - 10.3 (g / 100g) - 19.6 (g / 100g)) x 100 = 2,140 Magnesium: Theoretical content of magnesium in rice bran with 0% water and fat (mg / 100g) = 850 (mg / 100g) ÷ (100 - 10.3 (g / 100g) - 19.6 (g / 100g)) x 100 = 1,213 ...(Equation 4)

3. The soil conditioner according to claim 1 or 2, wherein the bran is in the form of concentrated rinse water.

4. A soil improvement material, comprising the soil improvement agent according to claim 1 or 2, substantially sealed in a container.

5. The soil improvement material according to claim 4, wherein the moisture content is adjusted to 20% to 50%.

6. The soil improvement material according to claim 4, which is a lactic acid fermented bokashi fertilizer or fermented feed.

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