Organic compound fertilizer for promoting rice growth and application thereof

Abstract

The invention discloses an organic compound fertilizer for promoting rice growth and application thereof, and belongs to the technical field of compound fertilizers. The organic compound fertilizer for promoting rice growth, provided by the invention, not only contains organic matters, but also contains inorganic nutrients and functional microorganisms, is rich in organic matters and various inorganic nutrients, can provide comprehensive nutrients for rice growth, and promotes healthy growth of rice. Urea, diammonium phosphate, potassium sulfate, calcium superphosphate and other inorganic fertilizers can provide nitrogen, phosphorus and potassium elements needed by rice growth and can be rapidly absorbed and utilized by rice; the animal waste, the rice straw enzymatic hydrolysate, the distillers' grains, the oil meal and the like can provide sufficient nutrients for rice and promote growth of the rice on one hand, can improve physical properties of soil and promote growth and development of rice root systems on the other hand, and are combined with the microelements, the compound microbial powder and the silicon fertilizer in use, and the components act together, so that the effect of improving the rice yield is achieved. The growth of the rice is promoted, the yield of the rice is increased, and the physical property of the soil is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of compound fertilizers, and particularly relates to an organic compound fertilizer for promoting the growth of rice and its application. Background Art

[0002] Rice is one of the important food crops in China. Its growth process includes multiple stages such as seedling stage, transplanting, greening stage, tillering stage, young panicle differentiation stage, heading and flowering stage, and filling stage. During the growth process of rice, fertilization is a key link to improve yield and quality. Commonly used fertilizers for rice planting include compound fertilizers such as nitrogen fertilizers (such as urea, ammonium bicarbonate), phosphate fertilizers (such as superphosphate), and potassium fertilizers (such as potassium chloride), which can quickly provide the major elements required for rice growth.

[0003] However, nitrogen, phosphorus, and potassium in the current compound fertilizers cannot be well absorbed by crops, resulting in low utilization rates. Moreover, since the nutrient requirements of rice are different at different growth stages, the existing conventional fertilizers cannot achieve the synchronization of the nutrient release rate with the progress of rice nutrient absorption. At the same time, applying a large amount of fertilizers at one time is likely to cause seedling burning in the seedling stage. Additionally, limited by human cultivation conditions and other factors, it is very difficult to carry out multiple topdressings, ultimately resulting in poor growth of rice due to lack of fertilizer. In addition, the large application of chemical fertilizers is likely to cause problems such as a decline in soil fertility, soil compaction, and continuous increase in production costs. Therefore, how to provide a compound fertilizer that can promote the growth of rice while improving the physical and chemical properties of the soil has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an organic compound fertilizer for promoting the growth of rice and its application.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides an organic compound fertilizer for promoting the growth of rice, which comprises the following raw materials in parts by weight: 20 - 40 parts of animal manure, 10 - 15 parts of urea, 7 - 12 parts of diammonium phosphate, 10 - 16 parts of potassium sulfate, 3 - 7 parts of superphosphate, 8 - 15 parts of enzymolysis liquid of rice straw, 12 - 18 parts of distiller's grains, 5 - 12 parts of oil cake, 2 - 5 parts of trace elements, 1 - 3 parts of compound microbial bacteria powder, and 1 - 2 parts of silicon fertilizer.

[0007] Technical Principle:

[0008] The present invention provides an organic compound fertilizer for promoting the growth of rice, which contains both organic matter, inorganic nutrients and functional microorganisms. It is rich in organic matter and various inorganic nutrients, can provide comprehensive nutrients for the growth of rice, and promote the healthy growth of rice. Inorganic fertilizers such as urea, diammonium phosphate, potassium sulfate, superphosphate, etc. can provide the nitrogen, phosphorus and potassium elements required for the growth of rice, and can be quickly absorbed and utilized by rice; animal manure, enzymolysis liquid of rice straw, distiller's grains, oil cake, etc. can, on the one hand, provide sufficient nutrients for rice to promote its growth, and on the other hand, can also improve the physical properties of the soil, promote the growth and development of rice roots. Combined with the use of trace elements, compound microbial powder and silicon fertilizer, the combined action of several components promotes the growth of rice, increases the yield of rice, and improves the physical properties of the soil.

[0009] Furthermore, the preparation method of the enzymolysis liquid of rice straw includes the following steps:

[0010] a. Mix rice straw with NaOH solution for pretreatment to obtain pretreated rice straw;

[0011] b. Spray cellulase solution on the pretreated rice straw obtained in step a for enzymolysis to obtain the enzymolysis liquid of rice straw.

[0012] Furthermore, in step a, the solid-liquid ratio of the rice straw to the NaOH solution is 1∶(6 - 10) (g / mL), and the mass concentration of the NaOH solution is 1 - 1.5%; the temperature of the pretreatment is 50 - 60 °C, and the time is 25 - 30 h.

[0013] Furthermore, in step b, the temperature of the enzymolysis is 50 - 55 °C, and the time is 36 - 72 h.

[0014] Furthermore, the animal manure is selected from at least one of chicken manure, duck manure and pig manure.

[0015] Furthermore, the trace elements are selected from at least one of iron, zinc, manganese, copper and boron.

[0016] Furthermore, the compound microbial powder is selected from two or three of nitrogen-fixing bacteria powder, phosphorus-solubilizing bacteria powder and potassium-solubilizing bacteria powder.

[0017] Furthermore, the silicon fertilizer is selected from at least one of yellow phosphorus slag, sodium metasilicate and silica.

[0018] The present invention provides a preparation method of the above-mentioned organic compound fertilizer for promoting the growth of rice, including the following steps:

[0019] (1) Mix animal manure, distiller's grains and oil cake and ferment them to obtain a fermentation product;

[0020] (2) Mix the fermentation product obtained in step (1) with urea, diammonium phosphate, potassium sulfate, superphosphate, rice straw enzymolysis solution, trace elements, compound microbial bacteria powder, and silicon fertilizer, and then crush, granulate, and screen to obtain the organic compound fertilizer for promoting rice growth.

[0021] The present invention also provides the application of the organic compound fertilizer for promoting rice growth described in the above technical solution in rice planting.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects:

[0023] The organic compound fertilizer provided by the present invention can provide rich and sufficient nutrients for rice growth, meet the growth requirements of rice, promote the rapid growth of rice, and can also improve the physical and chemical properties of the soil, enhance the water and fertilizer retention capacity of the soil, and improve the utilization rate of fertilizers.

[0024] The present invention utilizes agricultural waste rice straw, oil cake which is a by-product of oil crop processing, and distiller's grains which are by-products of wine brewing. It can not only provide rich nutrients for rice growth, promote the healthy growth of rice, but also increase the organic matter content of the soil, improve the physical and chemical properties of the soil, provide a better environment for the growth of rice roots, and at the same time reduce environmental pollution. Specific embodiments

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0027] The embodiment of the present invention provides an organic compound fertilizer for promoting rice growth, which comprises the following raw materials in parts by weight: 20 - 40 parts of animal manure, 10 - 15 parts of urea, 7 - 12 parts of diammonium phosphate, 10 - 16 parts of potassium sulfate, 3 - 7 parts of superphosphate, 8 - 15 parts of rice straw enzymolysis solution, 12 - 18 parts of distiller's grains, 5 - 12 parts of oil cake, 2 - 5 parts of trace elements, 1 - 3 parts of compound microbial bacteria powder, and 1 - 2 parts of silicon fertilizer.

[0028] In a preferred embodiment, by weight parts, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 20 - 40 parts of animal manure, further preferably 23 - 36 parts; the animal manure is selected from at least one of chicken manure, duck manure and pig manure. Animal manure is rich in macro elements such as nitrogen, phosphorus and potassium as well as various trace elements, which can provide sufficient nutrients for rice and promote its growth. At the same time, the organic matter rich in animal manure can also increase the organic matter content of the soil, improve the physical properties of the soil, and promote the growth and development of rice roots. In addition, the organic matter and microorganisms rich in animal manure can also improve the soil environment, enhance the stress resistance of rice, and improve the disease and pest resistance and lodging resistance of rice.

[0029] In a preferred embodiment, based on 20 - 40 parts by weight of animal manure, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 10 - 15 parts of urea, further preferably 12 - 15 parts. The urea in the present invention is used to provide the nitrogen element required for rice growth.

[0030] In a preferred embodiment, based on 20 - 40 parts by weight of animal manure, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 7 - 12 parts of diammonium phosphate, further preferably 8 - 11 parts. The diammonium phosphate in the present invention is used to provide the nitrogen element and phosphorus element required for rice growth.

[0031] In a preferred embodiment, based on 20 - 40 parts by weight of animal manure, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 10 - 16 parts of potassium sulfate, further preferably 12 - 16 parts. The potassium sulfate in the present invention is used to provide the potassium element required for rice growth and enhance the lodging resistance and disease and pest resistance of rice.

[0032] In a preferred embodiment, based on 20 - 40 parts by weight of animal manure, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 3 - 7 parts of superphosphate, further preferably 4 - 6 parts. The superphosphate in the present invention is used to provide the phosphorus element required for rice growth. When used in combination with urea, it can reduce the volatilization loss of nitrogen and improve the fertilizer utilization rate.

[0033] In a preferred embodiment, based on 20 - 40 parts by weight of animal manure, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 8 - 15 parts, further preferably 9 - 13 parts, of enzymatically hydrolyzed rice straw solution. The present invention adds the enzymatically hydrolyzed rice straw solution. On the one hand, it converts the waste of rice straw into useful fertilizer, reduces carbon dioxide emissions caused by straw burning or rotting, and reduces environmental pollution. On the other hand, after enzymatic hydrolysis, the rice straw can provide rich nutrients for rice growth, promote the growth and development of rice, thereby increasing the yield of rice. The enzymatically hydrolyzed straw can improve the physical and chemical properties of the soil and provide a better environment for the growth of rice roots.

[0034] In a preferred embodiment, the preparation method of the enzymatically hydrolyzed rice straw solution comprises the following steps:

[0035] a. Mix rice straw with NaOH solution for pretreatment to obtain pretreated rice straw;

[0036] b. Spray cellulase solution on the pretreated rice straw obtained in step a for enzymatic hydrolysis to obtain the enzymatically hydrolyzed rice straw solution.

[0037] In a preferred embodiment, in step a, the solid - liquid ratio of the rice straw to the NaOH solution is 1∶(6 - 10) (g / mL), further preferably 1∶(8 - 10) (g / mL); the mass concentration of the NaOH solution is 1 - 1.5%, further preferably 1.2 - 1.5%; the temperature of the pretreatment is 50 - 60°C, further preferably 53 - 57°C; the time of the pretreatment is 25 - 30 h, further preferably 25 - 28 h. By using alkali solution to pretreat rice straw, the present invention weakens the hydrogen bond between hemicellulose and cellulose and the ester bond between lignin and hemicellulose, breaks the straw structure, increases the porosity and internal specific surface area of the straw, improves the enzyme permeability, thereby increasing the contact area between the enzyme and cellulose and the enzyme hydrolysis rate, and is beneficial to the adsorption and enzymatic hydrolysis of cellulase.

[0038] In a preferred embodiment, in step b, the temperature of the enzymatic hydrolysis is 50 - 55°C, further preferably 52 - 55°C; the time of the enzymatic hydrolysis is 36 - 72 h, further preferably 36 - 48 h.

[0039] In a preferred embodiment, in step b, the preparation method of the cellulase solution is: dissolve 0.5 - 1.5 g of cellulase in a citric acid - sodium citrate buffer solution with a pH value of 4.8, and then make up the volume to 100 mL with the above buffer solution to obtain a cellulase solution with a concentration of 5 - 15 mg / mL.

[0040] In a preferred embodiment, based on 20 to 40 parts by weight of animal manure, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 12 to 18 parts of distiller's grains, more preferably 13 to 16 parts; the distiller's grains are selected from at least one of medium rice distiller's grains, corn distiller's grains, and beer distiller's grains. Distiller's grains are by-products generated during the brewing process, rich in organic matter, nutrients such as nitrogen, phosphorus, and potassium, as well as various trace elements, providing nutrient support for rice growth and promoting the healthy growth of rice.

[0041] In a preferred embodiment, based on 20 to 40 parts by weight of animal manure, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 5 to 12 parts of oil cake, more preferably 6 to 10 parts; the oil cake is selected from at least one of rapeseed cake, peanut cake, camellia seed cake, and soybean cake. Oil cake is a by-product of oil crop processing. Using it to prepare compound fertilizer can reduce waste emissions. The organic matter in the oil cake can improve soil structure, increase soil aeration and water retention. The oil cake can provide rich nutrients for rice growth, promote rice growth and increase production. At the same time, after the oil cake is decomposed by microorganisms in the soil, it can slowly release nutrients, providing long-term nutritional support for rice growth.

[0042] In a preferred embodiment, based on 20 to 40 parts by weight of animal manure, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 2 to 5 parts of trace elements, more preferably 2 to 4 parts; the trace elements are selected from at least one of iron, zinc, manganese, copper, and boron. Trace elements are essential nutrient elements for rice growth and development, are components and activators of various enzyme systems, and are also involved in a series of important physiological processes such as photosynthesis, respiration, hormone synthesis, and stress resistance. The addition of an appropriate amount of trace elements helps to promote rice growth and improve rice quality.

[0043] In a preferred embodiment, based on 20 to 40 parts by weight of animal manure, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 1 to 3 parts of compound microbial bacteria powder; the compound microbial bacteria powder is selected from two or three of nitrogen-fixing bacteria powder, phosphorus-solubilizing bacteria powder, and potassium-solubilizing bacteria powder. Bacterial populations such as nitrogen-fixing bacteria, phosphorus-solubilizing bacteria, and potassium-solubilizing bacteria can convert nutrients in the soil that are difficult for plants to absorb and utilize into available forms, improve the availability of nutrients such as nitrogen, phosphorus, and potassium in the soil, reduce the amount of fertilizer used, and at the same time enhance the disease resistance of rice.

[0044] In a preferred embodiment, based on 20 to 40 parts by weight of animal manure, the organic compound fertilizer for promoting rice growth provided by the present invention comprises 1 to 2 parts of silicon fertilizer; the silicon fertilizer is selected from at least one of yellow phosphorus slag, sodium metasilicate, and silica. Silicon is an extremely important nutrient element for crops. The application of silicon fertilizer is beneficial to improving the photosynthesis ability and insect and disease resistance ability of crops, and at the same time has an obvious improvement effect on the soil.

[0045] The present invention provides a method for preparing an organic compound fertilizer for promoting rice growth as described in the above technical solution, comprising the following steps:

[0046] (1) Mix animal manure, distiller's grains and oil cake and ferment them to obtain a fermentation product;

[0047] (2) Mix the fermentation product obtained in step (1) with urea, diammonium phosphate, potassium sulfate, superphosphate, rice straw enzymolysis liquid, trace elements, compound microbial bacteria powder and silicon fertilizer, and then pulverize, granulate and screen them to obtain the organic compound fertilizer for promoting rice growth.

[0048] In a preferred embodiment, in step (1), the temperature of the fermentation is 55-65 °C and the time is 5-8 days.

[0049] In a preferred embodiment, the average particle size of the organic compound fertilizer for promoting rice growth is 3-6 mm.

[0050] The present invention also provides the application of the organic compound fertilizer for promoting rice growth as described in the above technical solution in rice planting.

[0051] In the examples of the present invention, unless otherwise specified, "parts by weight" are represented.

[0052] In the following examples and comparative examples, the addition forms of iron, zinc, manganese, copper and boron are ferrous sulfate, iron, zinc sulfate, manganese sulfate, copper sulfate and boric acid respectively; the silica is silica treated by alcohol washing; the nitrogen-fixing bacteria powder, phosphorus-solubilizing bacteria powder and potassium-solubilizing bacteria powder are all commercially available products, and the viable bacteria counts of each bacteria powder in the compound microbial bacteria powder are all ≥ 2.0×10 9 cfu / g.

[0053] Unless otherwise specified, the raw materials in the examples of the present invention are all obtained through commercial channels.

[0054] Example 1

[0055] An organic compound fertilizer for promoting rice growth is composed of the following raw materials in parts by weight: 25 parts of chicken manure, 13 parts of urea, 8 parts of diammonium phosphate, 13 parts of potassium sulfate, 4 parts of superphosphate, 10 parts of rice straw enzymolysis liquid, 14 parts of beer distiller's grains, 6 parts of peanut oil cake, 3 parts of trace elements, 2 parts of compound microbial bacteria powder and 2 parts of sodium metasilicate; wherein, the compound microbial bacteria powder is composed of nitrogen-fixing bacteria powder, phosphorus-solubilizing bacteria powder and potassium-solubilizing bacteria powder according to a mass ratio of 1:1:1; the trace elements are composed of iron, zinc, manganese and boron according to a mass ratio of 1:1:1:1;

[0056] The preparation method of the rice straw enzymolysis liquid is:

[0057] a. Cut the rice straw into sections, then mix it with a NaOH solution with a mass concentration of 1.2% according to a solid-liquid ratio of 1:8 (g / mL), pretreat it at 53 °C for 26 h, wash it with water and dry it to obtain pretreated rice straw;

[0058] b. Spray cellulase solution on the pretreated rice straw obtained in step a, and enzymatically hydrolyze it at 53 °C for 48 h to obtain rice straw enzymatic hydrolysate; among them, the preparation method of the cellulase solution is: dissolve 0.8 g of cellulase in a citric acid-sodium citrate buffer solution with a pH value of 4.8, and then make up the volume to 100 mL with the above buffer solution to obtain a cellulase solution with a concentration of 8 mg / mL.

[0059] The preparation method of the organic compound fertilizer for promoting rice growth is as follows:

[0060] (1) Mix chicken manure, beer distillers grains and peanut oil meal and ferment them at 58 °C for 5 days to obtain a fermentation product;

[0061] (2) Mix the fermentation product obtained in step (1) with urea, diammonium phosphate, potassium sulfate, superphosphate, rice straw enzymatic hydrolysate, trace elements, compound microbial bacteria powder, and sodium metasilicate, and then crush, granulate and screen them to obtain an organic compound fertilizer for promoting rice growth with a particle size of 3-6 mm.

[0062] Example 2

[0063] An organic compound fertilizer for promoting rice growth is composed of the following raw materials in parts by weight: 35 parts of chicken manure, 14 parts of urea, 10 parts of diammonium phosphate, 15 parts of potassium sulfate, 6 parts of superphosphate, 9 parts of rice straw enzymatic hydrolysate, 16 parts of corn distillers grains, 7 parts of rapeseed oil meal, 4 parts of trace elements, 2 parts of compound microbial bacteria powder and 1 part of yellow phosphorus slag; among them, the compound microbial bacteria powder is composed of nitrogen-fixing bacteria powder and phosphorus-solubilizing bacteria powder according to a mass ratio of 1:1; the trace elements are composed of iron, zinc, manganese and boron according to a mass ratio of 1:1:1:1;

[0064] The preparation method of the rice straw enzymatic hydrolysate is:

[0065] a. Cut the rice straw into sections, then mix it with a NaOH solution with a mass concentration of 1.5% according to a solid-liquid ratio of 1:10 (g / mL), pretreat it at 55 °C for 25 h, wash it with water and dry it to obtain pretreated rice straw;

[0066] b. Spray cellulase solution on the pretreated rice straw obtained in step a, and enzymatically hydrolyze it at 55 °C for 36 h to obtain rice straw enzymatic hydrolysate; among them, the preparation method of the cellulase solution is: dissolve 1.5 g of cellulase in a citric acid-sodium citrate buffer solution with a pH value of 4.8, and then make up the volume to 100 mL with the above buffer solution to obtain a cellulase solution with a concentration of 15 mg / mL.

[0067] The preparation method of the organic compound fertilizer for promoting rice growth is the same as that in Example 1.

[0068] Example 3

[0069] An organic compound fertilizer for promoting rice growth is composed of the following raw materials in parts by weight: 40 parts of duck manure, 10 parts of urea, 7 parts of diammonium phosphate, 14 parts of potassium sulfate, 5 parts of superphosphate, 15 parts of enzymolysis liquid of rice straw, 16 parts of rice distiller's grains, 8 parts of camellia seed cake, 5 parts of trace elements, 1 part of compound microbial bacteria powder and 1 part of silica; among them, the compound microbial bacteria powder is composed of nitrogen-fixing bacteria powder, phosphorus-solubilizing bacteria powder and potassium-solubilizing bacteria powder according to the mass ratio of 1:1:1; the trace elements are composed of iron, zinc, manganese, copper and boron according to the mass ratio of 1:1:1:1:1.

[0070] The preparation method of the enzymolysis liquid of rice straw is as follows:

[0071] a. Cut the rice straw into sections, then mix it with 1% NaOH solution according to the solid-liquid ratio of 1:7 (g / mL), pretreat it at 58 °C for 26 h, wash it with water and dry it to obtain pretreated rice straw.

[0072] b. Spray cellulase solution on the pretreated rice straw obtained in step a, enzymolyze it at 52 °C for 42 h to obtain the enzymolysis liquid of rice straw; among them, the preparation method of the cellulase solution is: dissolve 1.2 g of cellulase in citric acid-sodium citrate buffer solution with a pH value of 4.8, and then make up the volume to 100 mL with the above buffer solution to obtain a cellulase solution with a concentration of 12 mg / mL.

[0073] The preparation method of the organic compound fertilizer for promoting rice growth is the same as that in Example 1.

[0074] Example 4

[0075] An organic compound fertilizer for promoting rice growth is composed of the following raw materials in parts by weight: 30 parts of pig manure, 13 parts of urea, 10 parts of diammonium phosphate, 14 parts of potassium sulfate, 6 parts of superphosphate, 13 parts of enzymolysis liquid of rice straw, 15 parts of beer distiller's grains, 9 parts of peanut cake, 4 parts of trace elements, 2 parts of compound microbial bacteria powder and 1 part of sodium metasilicate; among them, the compound microbial bacteria powder is composed of nitrogen-fixing bacteria powder, phosphorus-solubilizing bacteria powder and potassium-solubilizing bacteria powder according to the mass ratio of 1:1:1; the trace elements are composed of iron, zinc, manganese, copper and boron according to the mass ratio of 1:1:1:1:1.

[0076] The preparation method of the enzymolysis liquid of rice straw is as follows:

[0077] a. Cut the rice straw into sections, then mix it with a NaOH solution with a mass concentration of 1.3% according to a solid-liquid ratio of 1:8 (g / mL), pretreat it at 55 °C for 27 h, wash it with water and dry it to obtain pretreated rice straw;

[0078] b. Spray cellulase solution on the pretreated rice straw obtained in step a, enzymatically hydrolyze it at 50 °C for 56 h to obtain a rice straw enzymatic hydrolysate; among them, the preparation method of the cellulase solution is: dissolve 0.8 g of cellulase in a citric acid-sodium citrate buffer solution with a pH value of 4.8, and then make up the volume to 100 mL with the above buffer solution to obtain a cellulase solution with a concentration of 8 mg / mL.

[0079] The preparation method of the organic compound fertilizer for promoting rice growth is the same as that in Example 1.

[0080] Example 5

[0081] An organic compound fertilizer for promoting rice growth is composed of the following raw materials in parts by weight: 20 parts of pig manure, 15 parts of urea, 12 parts of diammonium phosphate, 16 parts of potassium sulfate, 7 parts of superphosphate, 12 parts of rice straw enzymatic hydrolysate, 12 parts of corn distillers grains, 10 parts of soybean oil meal, 2 parts of trace elements, 3 parts of compound microbial bacteria powder and 1 part of yellow phosphorus slag; among them, the compound microbial bacteria powder is composed of nitrogen-fixing bacteria powder, phosphorus-solubilizing bacteria powder and potassium-solubilizing bacteria powder according to a mass ratio of 1:1:1; the trace elements are composed of iron, zinc, manganese, copper and boron according to a mass ratio of 1:1:1:1:1;

[0082] The preparation method of the rice straw enzymatic hydrolysate is as follows:

[0083] a. Cut the rice straw into sections, then mix it with a NaOH solution with a mass concentration of 1.1% according to a solid-liquid ratio of 1:6 (g / mL), pretreat it at 57 °C for 29 h, wash it with water and dry it to obtain pretreated rice straw;

[0084] b. Spray cellulase solution on the pretreated rice straw obtained in step a, enzymatically hydrolyze it at 52 °C for 40 h to obtain a rice straw enzymatic hydrolysate; among them, the preparation method of the cellulase solution is: dissolve 1.3 g of cellulase in a citric acid-sodium citrate buffer solution with a pH value of 4.8, and then make up the volume to 100 mL with the above buffer solution to obtain a cellulase solution with a concentration of 13 mg / mL.

[0085] The preparation method of the organic compound fertilizer for promoting rice growth is the same as that in Example 1.

[0086] Comparative Example 1

[0087] An organic compound fertilizer for promoting rice growth, which is composed of the following raw materials in parts by weight: 25 parts of chicken manure, 13 parts of urea, 8 parts of diammonium phosphate, 13 parts of potassium sulfate, 4 parts of superphosphate, 3 parts of trace elements, and 2 parts of compound microbial bacteria powder; wherein, the compound microbial bacteria powder is composed of nitrogen-fixing bacteria powder, phosphorus-solubilizing bacteria powder, and potassium-solubilizing bacteria powder in a mass ratio of 1:1:1; the trace elements are composed of iron, zinc, manganese, and boron in a mass ratio of 1:1:1; the preparation method of the organic compound fertilizer for promoting rice growth is the same as that in Example 1.

[0088] Comparative Example 2

[0089] The difference from Example 1 is that it does not contain rice straw enzyme hydrolysate, and the others are the same as Example 1.

[0090] Comparative Example 3

[0091] The difference from Example 1 is that the rice straw enzyme hydrolysate is replaced with corn straw enzyme hydrolysate in equal parts by weight, and the others are the same as Example 1; wherein, the preparation method of the corn straw enzyme hydrolysate is the same as that of the rice straw enzyme hydrolysate.

[0092] Comparative Example 4

[0093] The difference from Example 1 is that it does not contain beer distillers grains and peanut oil meal, and the others are the same as Example 1.

[0094] Comparative Example 5

[0095] The difference from Example 1 is that the preparation method of the rice straw enzyme hydrolysate is as follows: cut the rice straw into sections, then spray cellulase solution, and enzymatically hydrolyze at 53 °C for 48 h to obtain the rice straw enzyme hydrolysate; wherein, the preparation method of the cellulase solution is: dissolve 0.8 g of cellulase in citric acid-sodium citrate buffer solution with a pH value of 4.8, and then make up the volume to 100 mL with the above buffer solution to obtain a cellulase solution with a concentration of 8 mg / mL, and the others are the same as Example 1.

[0096] Set up a rice planting test area with complete infrastructure supporting and good irrigation and drainage capacity. The physical and chemical properties of the soil in the planting test area are: organic matter 20.3 g / kg, total nitrogen 1.16 g / kg, available phosphorus 6.8 mg / kg, available potassium 40.8 mg / kg, pH 5.6. The tested rice variety is Liangyou 8106. The planting density is 260831 holes / hm 2 The fertilization method is: applied once as base fertilizer, 85 kg / hm 2 The test is set with 10 treatments and repeated 3 times. Except for the different types of compound fertilizers, other management measures are the same.

[0097] After the rice was mature, 5 hills of plants were selected from each experimental plot for investigation, and the plant height, panicle length, number of grains per panicle, and 1000-grain weight were recorded. At the same time, the actual yield of each experimental plot, that is, the weight of paddy (excluding the surrounding rows, empty stalks, and plants with pest and disease variations), was measured. The results are shown in Table 1.

[0098] After the rice was mature, 5 soil samples were randomly collected from each experimental plot, evenly mixed, and sampled by the quartering method. After the soil samples were collected, they were air-dried and sieved for the determination of physical and chemical properties. Soil organic matter was determined by the potassium dichromate-sulfuric acid oxidation method. Total nitrogen in the soil was determined by the semi-micro Kjeldahl method. Available phosphorus was determined by colorimetry after extracting the soil samples at a solid-liquid ratio of 1:10 (g / mL) with hydrochloric acid-ammonium fluoride. Available potassium was determined by flame photometry after extracting the soil samples at a solid-liquid ratio of 1:10 (g / mL) with 1 mol / L ammonium acetate. The results are shown in Table 2.

[0099] Table 1

[0100]

[0101]

[0102] As can be seen from Table 1, when the organic compound fertilizer for promoting rice growth provided by the present invention was applied, the plant height of the rice could reach 100.7 - 102.2 cm, the number of panicles could reach 28.80 - 28.92×10 5 / hm 2 , the 1000-grain weight could reach 22.7 - 23.1 g, and the actual yield could reach 9492.6 - 9638.4 kg / hm 2 . In Comparative Examples 1 - 5, due to the change in the composition of the compound fertilizer, the type of rice straw enzyme hydrolysate, or the preparation process of the rice straw enzyme hydrolysate, the promoting effect of the obtained compound fertilizer on rice was significantly lower than that of Example 1. Especially in Comparative Example 1, due to the omission of distiller's grains, soybean meal, rice straw enzyme hydrolysate, and silicon fertilizer at the same time, the 1000-grain weight of the rice was only 22.1 g, and the actual yield was only 8459.2 kg / hm 2 , and the yield was reduced by 1051 kg / hm compared with Example 1 2 , indicating that the organic compound fertilizer provided by the present invention can significantly promote the growth of rice and increase the yield of rice.

[0103] Table 2

[0104] pH Organic matter g / kg Total nitrogen g / kg Available phosphorus mg / kg Available potassium mg / kg Example 1 5.8 24.1 1.35 8.1 48.3 Example 2 5.9 23.8 1.33 7.8 48.1 Example 3 5.9 23.3 1.32 7.6 47.3 Example 4 6.0 24.6 1.38 8.5 50.2 Example 5 5.8 23.6 1.34 7.8 47.5 Comparative Example 1 5.6 20.9 1.13 6.6 43.6 Comparative Example 2 5.6 21.7 1.20 6.8 44.3 Comparative Example 3 5.7 22.3 1.27 7.0 45.4 Comparative Example 4 5.6 21.8 1.22 6.9 44.7 Comparative Example 5 5.7 22.6 1.25 7.2 45.9 Blank soil 5.6 20.3 1.16 6.8 40.8

[0105] As can be seen from Table 2, the organic compound fertilizer for promoting rice growth provided by the present invention can improve the physical and chemical properties of the soil, increase soil fertility, and weaken soil acidity. After applying the organic compound fertilizer provided by the present invention, the organic matter and total nitrogen content in the soil have been significantly improved, and the available phosphorus and available potassium that are convenient for rice absorption have also been significantly increased. However, the compound fertilizers provided in Comparative Examples 1-5 have no obvious improvement on the physical and chemical properties of the soil, indicating that the organic compound fertilizer provided by the present invention can not only promote rice growth, but also improve the physical and chemical properties of the soil.

[0106] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An organic compound fertilizer for promoting rice growth, characterized in that: The invention comprises the following raw materials in parts by weight: 20-40 parts of animal excrement, 10-15 parts of urea, 7-12 parts of diammonium phosphate, 10-16 parts of potassium sulfate, 3-7 parts of superphosphate, 8-15 parts of rice straw enzymatic hydrolysate, 12-18 parts of distiller's grains, 5-12 parts of oil meal, 2-5 parts of trace elements, 1-3 parts of composite microbial powder and 1-2 parts of silicon fertilizer.

2. The organic compound fertilizer for promoting rice growth according to claim 1, characterized in that: The method for preparing the rice straw enzymatic hydrolyzate comprises the following steps: a. Pre-treating the rice straw by mixing it with a NaOH solution to obtain pre-treated rice straw; b. Spraying the pretreated rice straw obtained in step a with a cellulase solution for enzymolysis to obtain the rice straw enzymolysis solution.

3. The organic compound fertilizer for promoting rice growth according to claim 2, characterized in that: In step a, the solid-liquid ratio of the rice straw to the NaOH solution is 1:(6-10) (g / mL), the mass concentration of the NaOH solution is 1-1.5%; the pretreatment temperature is 50-60° C., and the time is 25-30 hours.

4. The organic compound fertilizer for promoting rice growth according to claim 2, characterized in that: In step b, the enzymatic hydrolysis temperature is 50-55° C. and the time is 36-72 hours.

5. The organic compound fertilizer for promoting rice growth according to claim 1, characterized in that: The animal manure is selected from at least one of chicken manure, duck manure and pig manure.

6. The organic compound fertilizer for promoting rice growth according to claim 1, characterized in that: The trace element is selected from at least one of iron, zinc, manganese, copper and boron.

7. The organic compound fertilizer for promoting rice growth according to claim 1, characterized in that: The composite microbial powder is selected from two or three of nitrogen-fixing bacteria powder, phosphate-solubilizing bacteria powder and potassium-solubilizing bacteria powder.

8. The organic compound fertilizer for promoting rice growth according to claim 1, characterized in that: The silicon fertilizer is selected from at least one of yellow phosphorus slag, sodium metasilicate and silica.

9. A method for preparing the organic compound fertilizer for promoting rice growth according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) mixing animal feces, distiller's grains and oil meal and fermenting them to obtain a fermentation product; (2) The fermentation product obtained in step (1) is mixed with urea, diammonium phosphate, potassium sulfate, superphosphate, rice straw enzymatic hydrolyzate, trace elements, composite microbial powder, and silicon fertilizer, and then crushed, granulated, and sieved to obtain the organic compound fertilizer for promoting rice growth.

10. Use of the organic compound fertilizer for promoting rice growth according to any one of claims 1 to 8 in rice planting.

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