Method for synergistically improving soil fertility through soil conditioner and green manure crops

Abstract

The invention discloses a method for synergistically improving soil fertility through a soil conditioner and green manure crops, and belongs to the technical field of soil improvement, and the method comprises the following steps: after rice is harvested, soil is deeply ploughed and tedded, the soil conditioner is uniformly spread on the surface of the soil, and then the green manure crops are planted; in the full-bloom stage of the green manure crops, the green manure crops are turned and returned to the field; and finally transplanting rice seedlings. The soil conditioner comprises the following raw materials: enteromorpha-based biochar, diatomite, silica sol, plant ash, hydroxy calcium phosphate, magnesium sulfate heptahydrate and ferrous sulfate. Through scientific compatibility of modifier components and precise agronomic process design, the short-term fertility of the red and yellow soil low-yield field is remarkably improved, a long-acting soil fertility improvement mechanism is established through continuous input of green manure, the yield of rice is increased, and remarkable ecological value and economic value are achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of soil improvement, and particularly relates to a method for improving soil fertility by using a soil improver in combination with green manure crops. BACKGROUND

[0002] The Jinqu Basin is located in the middle and western part of Zhejiang Province and is an important grain production area in the province. The widely distributed red-yellow soil in this region has the typical characteristics of strong acidity, low organic matter content, serious phosphorus fixation, soil compaction, and poor water and fertilizer retention capacity, which leads to poor root development and low nutrient absorption efficiency of rice, and the rice has been in a long-term low-yield state. The existing improvement measures mainly include applying lime to adjust the acidity, increasing the application of chemical fertilizers or commercial organic fertilizers, but these methods have problems such as high cost, short-term effect, easy soil compaction, and nutrient imbalance.

[0003] At present, the soil improvers on the market are mostly single-function products, such as lime-based acid regulators, biochar-based structure improvers, and humic acid-based organic fertilizers. Although compound improvers have been developed, they generally have the shortcomings of simple composition, lack of systematic design, difficulty in achieving the synergistic effect of acid-base adjustment, organic matter improvement, phosphorus activation, and biological remediation. In addition, some products are expensive and difficult to promote in large areas of low-yield fields.

[0004] In recent years, green manure crops have been gradually promoted in the southern rice-growing areas. They improve the fertility through nitrogen fixation, organic matter increase, and structure improvement, and are an ecological friendly improvement method. However, single green manure has a long turning period and limited short-term effect, and its growth is limited in poor soil, making it difficult to quickly improve the conditions of low-yield fields. If green manure crops can be combined with efficient compound improvers to form a "biological + chemical + physical" synergistic improvement mode, it is expected to break through the bottleneck of existing technology and achieve rapid and long-term improvement of soil fertility.

[0005] Therefore, there is an urgent need to develop an integrated technical solution that can quickly improve the physical and chemical properties of soil and achieve long-term fertility improvement in combination with green manure crops. SUMMARY

[0006] In view of the above technical problems, the application provides a method for improving soil fertility by using a soil improver in combination with green manure crops.

[0007] To achieve the above-mentioned purpose, the application provides the following technical solutions:

[0008] A method for improving soil fertility by using a soil improver in combination with green manure crops, comprising the following steps:

[0009] After the rice is harvested, the soil is deep plowed and sunned to a depth of 15-25 cm;

[0010] The soil improver is uniformly applied to the surface of the soil, and then the green manure crop is planted.

[0011] In the full-bloom period of green manure crops, the green manure crops are turned into the field for decomposition;

[0012] Finally, rice seedlings are transplanted;

[0013] The soil conditioner comprises the following raw materials:

[0014] Enteromorpha-based biochar, diatomite, silica sol, wood ash, hydroxyapatite, magnesium sulfate heptahydrate and ferrous sulfate.

[0015] Beneficial effects: The present application combines the carefully designed soil conditioner formula with the agronomic measures of green manure crop planting to construct a systematic technical system of "physical structure improvement-chemical environment regulation-nutrient slow-release supply-biological cycle synergistic effect", which effectively overcomes the multiple obstacles of acid, thin, hard, and stagnant of the low-yield red-yellow soil in the Jinqu Basin. The technology not only realizes the rapid improvement of soil physical and chemical properties, but also establishes a long-term fertility improvement mechanism through the synergistic effect with green manure crops.

[0016] In terms of raw material compatibility, the components of the present application form a multi-level and multi-path synergistic effect. Enteromorpha-based biochar, as the core functional material, is prepared by anaerobic pyrolysis of Enteromorpha. It is rich in stable aromatic carbon structure and a large number of surface functional groups, has a very high specific surface area and cation exchange capacity. It can not only significantly improve the stability of soil aggregates, enhance the soil aeration and water permeability, and alleviate the hardening problem of red-yellow soil, but also fix free aluminum ions in the soil through surface adsorption, reducing their toxicity to green manure and subsequent rice roots. More importantly, its porous structure provides an ideal habitat for soil microorganisms, creating a favorable microecological environment for the rapid decomposition of green manure after turning.

[0017] Diatomite and silica sol together constitute a "silicon-based functional system". Diatomite is a natural porous siliceous mineral with strong adsorption capacity and ion exchange capacity, which can effectively improve the water and fertilizer retention capacity of soil, especially in seasonal drought conditions. While silica sol, as a nanoscale silica dispersion liquid, the highly active SiO2 particles can gradually release soluble silicon after being applied to the soil, which is absorbed by green manure crops to enhance cell wall thickness, improve stress resistance and biomass accumulation. At the same time, silica sol can form surface complexes with iron and aluminum oxides in the soil, reducing their fixation of phosphate, thereby indirectly improving the availability of phosphorus. The synergistic use of diatomite and silica sol realizes the combination of macroscopic structure support and microscopic nutrient regulation, significantly enhancing the buffering capacity and nutrient retention capacity of the soil.

[0018] As a natural alkaline substance, wood ash is rich in potassium carbonate, calcium carbonate and other components, which can gently and continuously neutralize soil acidity, avoiding the risk of soil compaction caused by the dramatic pH fluctuation of lime substances. At the same time, the potassium, calcium, magnesium and other elements provided by wood ash can be directly absorbed and utilized by green manure, promoting its rapid growth and providing more organic matter sources for subsequent field application.

[0019] As a slow-release phosphorus source, calcium hydroxyphosphate has a micron-sized particle size design that allows it to slowly dissolve in acidic soil, continuously release phosphate ions, avoid the rapid fixation and loss of water-soluble phosphorus fertilizer, and achieve a dynamic balance of "release and activation", significantly improving the utilization efficiency of phosphorus.

[0020] Magnesium sulfate heptahydrate and ferrous sulfate provide the necessary trace elements for the growth of green manure. Magnesium is the core component of chlorophyll and is essential for photosynthesis; iron participates in various enzymatic reactions and prevents green manure from appearing iron deficiency yellowing. In the acidic conditions of red-yellow soil, the availability of iron and magnesium is often limited, and exogenous supplementation can effectively ensure the healthy growth of green manure and maximize its potential for nitrogen fixation and organic matter increase.

[0021] In terms of method steps, the process flow design of the present application embodies clear logical progression and functional coupling. First, deep plowing and sunning is the physical basis of the entire technical system, which breaks the plough pan, improves soil permeability, and uses sunlight and redox substances to eliminate potential hazards, creating a good physical environment for the subsequent application of amendments and green manure. Subsequently, amendments are applied after sunning and green manure is planted, allowing the acid-adjusting, fertilizer-providing, and soil-improving functions of the amendments to be synchronized with the biological nitrogen fixation and organic matter increase functions of the green manure, forming a two-way promotion mechanism of "amendments promoting green manure and green manure fixing amendments". When the green manure is grown to the flowering stage, it is plowed and applied to the field, at which time its biomass is the largest, its nutrient content is the highest, and it is easy to decompose. In the suitable environment created by the amendments, the green manure residues and microorganisms and organic matter in the soil interact, rapidly mineralize, and release a large amount of nutrients, forming a fertile plough layer. Finally, rice seedlings are transplanted, at which time the soil has entered the peak period of nutrient release, and the structure is loose and the fertility is sufficient, laying a solid foundation for high-yield rice.

[0022] In summary, the present application realizes the whole-chain synergy of "physical barrier breaking-chemical tuning-nutrient slow release-biological circulation" through the scientific combination of amendment components and precise agronomic process design, not only significantly improving the short-term fertility of red-yellow soil low-yield fields, but also establishing a long-term soil fertility improvement mechanism through the continuous input of green manure, with significant ecological benefits and promotional value.

[0023] Optionally, the particle size of the calcium hydroxyphosphate is 1-10 μm;

[0024] The mass concentration of silicon dioxide in the silica sol is 20-30%.

[0025] Further, the soil conditioner comprises the following raw materials in parts by weight:

[0026] Enteromorpha-based biochar 30-50 parts, diatomite 15-25 parts, silica sol 12-18 parts, wood ash 10-20 parts, calcium hydroxyphosphate 10-15 parts, magnesium sulfate heptahydrate 10-12 parts, and ferrous sulfate 8-9 parts.

[0027] Further, the soil conditioner comprises the following raw materials in parts by weight:

[0028] Enteromorpha-based biochar 30 parts, diatomite 15 parts, silica sol 12 parts, wood ash 10 parts, calcium hydroxyphosphate 10 parts, magnesium sulfate heptahydrate 12 parts, and ferrous sulfate 9 parts.

[0029] Further, the soil conditioner comprises the following raw materials in parts by weight:

[0030] Enteromorpha-based biochar 42 parts, diatomite 20 parts, silica sol 15 parts, wood ash 16 parts, calcium hydroxyphosphate 12 parts, magnesium sulfate heptahydrate 11 parts, and ferrous sulfate 9 parts.

[0031] Further, the soil conditioner comprises the following raw materials in parts by weight:

[0032] Enteromorpha-based biochar 50 parts, diatomite 25 parts, silica sol 18 parts, wood ash 20 parts, calcium hydroxyphosphate 15 parts, magnesium sulfate heptahydrate 10 parts, and ferrous sulfate 8 parts.

[0033] Further, the preparation process of the Enteromorpha-based biochar is as follows: washing and drying Enteromorpha, pyrolyzing at 400-600°C under anaerobic conditions for 2-4 hours to obtain Enteromorpha-based biochar.

[0034] Optionally, the preparation process of the soil conditioner is as follows:

[0035] The diatomite and wood ash are pretreated, and the specific operation is as follows: drying the diatomite and wood ash at 105°C for 2 hours to remove water; after drying, grinding them respectively with a grinder and passing them through a 100-mesh sieve to ensure uniform particles and facilitate subsequent mixing;

[0036] Under stirring, adding calcium hydroxyphosphate, magnesium sulfate heptahydrate, and ferrous sulfate into the silica sol in sequence, and continuously stirring until all solid components are completely dissolved to form a uniform liquid mixture;

[0037] Mixing the Enteromorpha-based biochar, pretreated diatomite, and wood ash uniformly to obtain a solid mixture;

[0038] The liquid phase mixture is evenly added to the continuously rolling solid phase mixture by spraying, after uniform mixing, the obtained wet material is granulated to form spherical particles with a particle size of 3-5mm, then drying is carried out at a temperature of 80-105 DEG C until the water content of the particles is less than 5%, and the soil conditioner is prepared.

[0039] Optionally, the application amount of the soil conditioner is 200-300 kg / mu.

[0040] Optionally, the soil conditioner is applied while applying organic fertilizer, and the application amount of the organic fertilizer is 1000-2000 kg / mu.

[0041] Optionally, the green manure crop is Astragalus sinicus or Vicia.

[0042] Further, the seeding amount of the green manure crop is 1.5-2.5 kg / mu.

[0043] Compared with the prior art, the present application has the following advantages and technical effects:

[0044] The present application provides a method for improving soil fertility by using a soil conditioner and green manure crop, which realizes systematic repair of soil physical and chemical properties and long-term improvement of biological fertility by combining a specially designed composite soil conditioner with green manure planting agricultural measures.

[0045] The present application uses Enteromorpha-based biochar as the core framework, cooperates with diatomite and silica sol to enhance the stability of soil structure and the water and fertilizer retention capacity; uses wood ash to moderately adjust the pH value, alleviates aluminum and manganese toxicity, and creates a suitable pH environment for the growth of green manure; uses micron-sized calcium hydroxyl phosphate to realize slow-release supply of phosphorus, reduces fixation loss; and supplements with magnesium sulfate heptahydrate and ferrous sulfate to supplement key trace elements, ensuring the healthy growth of green manure. The functions of the components are complementary and synergistic, not only rapidly improving the problems of soil acidification, leanness, hardening, and stagnation, but also providing strong support for the vigorous growth of green manure crops.

[0046] In terms of method steps, the present application realizes the virtuous cycle of "using the conditioner to promote green manure and using green manure to fix soil fertility" through the steps of breaking the plough pan by deep ploughing and sunning, optimizing the soil environment by applying the conditioner, fixing nitrogen and increasing carbon by planting green manure, and promoting decomposition by turning under at the flowering stage. The method not only significantly improves the soil organic matter content, effective phosphorus level and aggregate stability, but also enhances the soil biological activity through the biological action of green manure, realizing the rapid improvement and long-term maintenance of soil fertility.

[0047] The application has the advantages of wide raw material sources, low cost, simple process, ecological friendliness and the like, avoids secondary problems caused by single application of lime or chemical fertilizer, and overcomes the limitations of long cycle and slow effect of pure green manure returning to field. Field tests show that the synergistic method of the application can significantly improve soil fertility and rice yield, has a significant synergistic effect, and provides an efficient and ecological technical path for red-yellow soil low-yield field improvement. DETAILED DESCRIPTION

[0048] Various exemplary embodiments of the present application will now be described in detail, which should be considered in a descriptive sense only and not for purposes of limitation to the application described. Rather, understand that the present application is in all respects the best mode contemplated of carrying out the application in an embodiment.

[0049] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Additionally, the use of the term "about" in relation to a value or a range of values is intended to include each individual intermediate value and each smaller range that falls within the range of values. The upper and lower limits of these smaller ranges can be independently included or excluded from the range.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application, preferred methods and materials are described. All publications mentioned in this specification are herein incorporated by reference to disclose and describe the methods and / or materials in connection with which the publications are cited. The citation of any reference in this specification is not intended as an admission that the reference is prior art, but rather that the reference is part of the technical knowledge in the art.

[0051] Many modifications and variations of this application specification can be made in light of the above teachings without departing from the spirit or scope of the application. Other implementations of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are exemplary only.

[0052] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having", and the like are open-ended terms that are intended to mean including, but not limited to.

[0053] As used herein, the term "room temperature" refers to 20-30 DEG C, unless otherwise specified.

[0054] As used herein, the term "parts" refers to mass parts, unless otherwise specified.

[0055] The raw materials used in the application are all purchased on the market. The organic fertilizer used in the embodiment of the application is fully matured commercial organic fertilizer or farmyard manure, which is mainly made of livestock and poultry manure (such as pig manure, cow manure or chicken manure), crop straw, cake and other agricultural wastes through aerobic fermentation and maturation, and the physicochemical indexes are as follows: organic matter content ≥ 45%; total nutrient (N + P2O5 + K2O) ≥ 5%; meeting the index requirements specified in NY / T 525-2021.

[0056] The technical solutions of the application are further described below through examples.

[0057] Example 1

[0058] A method for improving soil fertility by using a soil conditioner in cooperation with green manure crops, comprising the following steps:

[0059] After the rice is harvested, the soil is deep plowed and sunned, with a depth of 15-25 cm;

[0060] The soil conditioner is uniformly applied to the surface of the soil at an application amount of 250 kg / acre, and at the same time, the organic fertilizer is applied at an application amount of 1800 kg / acre; then the green manure crop (Astragalus sinicus) is planted, with a seeding amount of 2.0 kg / acre;

[0061] In the full flowering period of the green manure crop, it is turned into the field for decomposition;

[0062] Finally, rice seedlings are transplanted;

[0063] The soil conditioner comprises the following raw materials:

[0064] 50 parts of Enteromorpha-based biochar, 25 parts of diatomite, 18 parts of silica sol, 20 parts of wood ash, 15 parts of calcium hydroxyl phosphate, 10 parts of magnesium sulfate heptahydrate and 8 parts of ferrous sulfate; wherein the particle size of the calcium hydroxyl phosphate is 1-10 μm; the mass concentration of silicon dioxide in the silica sol is 27%; the preparation process of the Enteromorpha-based biochar is as follows: after the Enteromorpha is washed, dried and pyrolyzed at 600℃ under anaerobic conditions for 2 hours, the Enteromorpha-based biochar is obtained.

[0065] The preparation process of the above soil conditioner is as follows:

[0066] The diatomite and the wood ash are pretreated, and the specific operation is as follows: the diatomite and the wood ash are dried at 105℃ for 2 hours respectively to remove water; after drying, they are ground respectively by a grinding machine and passed through a 100-mesh sieve to ensure uniform particles and facilitate subsequent mixing;

[0067] Under stirring, the calcium hydroxyl phosphate, the magnesium sulfate heptahydrate and the ferrous sulfate are sequentially added to the silica sol, and the stirring is continued until all the solid components are completely dissolved to form a uniform liquid mixture;

[0068] Mixing the Enteromorpha-based biochar, the pretreated diatomite and the wood ash uniformly to obtain a solid-phase mixture;

[0069] The liquid-phase mixture is uniformly added to the continuously rolling solid-phase mixture by spraying, and after uniform mixing, the obtained wet material is granulated to form spherical particles with a particle size of 3-5 mm; then dried at a temperature of 100°C until the water content of the particles is less than 5%, to prepare the soil conditioner.

[0070] Example 2

[0071] The difference from Example 1 is that the soil conditioner comprises the following raw materials according to weight fraction:

[0072] Enteromorpha-based biochar 42 parts, diatomite 20 parts, silica sol 15 parts, wood ash 16 parts, calcium hydroxyphosphate 12 parts, magnesium sulfate heptahydrate 11 parts and ferrous sulfate 9 parts. Other steps and conditions are the same as in Example 1.

[0073] Example 3

[0074] The difference from Example 1 is that the soil conditioner comprises the following raw materials according to weight fraction:

[0075] Enteromorpha-based biochar 30 parts, diatomite 15 parts, silica sol 12 parts, wood ash 10 parts, calcium hydroxyphosphate 10 parts, magnesium sulfate heptahydrate 12 parts and ferrous sulfate 9 parts. Other steps and conditions are the same as in Example 1.

[0076] Example 4

[0077] The difference from Example 1 is that the green manure crop planted is vetch. Other steps and conditions are the same as in Example 1.

[0078] Comparative Example 1

[0079] The difference from Example 1 is that no soil conditioner is applied in the method steps. Other steps and conditions are the same as in Example 1.

[0080] Comparative Example 2

[0081] The difference from Example 1 is that no green manure crop is planted in the method steps. Other steps and conditions are the same as in Example 1.

[0082] Comparative Example 3

[0083] The difference from Example 1 is that the soil conditioner added is corn straw biochar. Other steps and conditions are the same as in Example 1.

[0084] Comparative Example 4

[0085] The difference from example 1 is that diatomite is not added in the soil conditioner. Other steps and conditions are the same as example 1.

[0086] Comparative example 5

[0087] The difference from example 1 is that silica sol is not added in the soil conditioner. Other steps and conditions are the same as example 1.

[0088] Effect verification

[0089] According to the methods of examples 1-4 and comparative examples 1-5, field tests were carried out in low-yield red-yellow soil in Jinhua under the same soil conditions. After 100 days of rice maturity, soil fertility and rice yield were tested. Then, taking the blank control as the base, the growth rates of soil organic matter, available phosphorus and rice yield in different test fields were obtained. The specific values are shown in Table 1.

[0090] Table 1

[0091] Soil pH Organic matter increase rate / % Available phosphorus increase rate / % Rice yield increase rate / % Example 1 6.2 35.6 38.3 38.7 Example 2 6.1 33.8 38.0 36.5 Example 3 6.1 31.2 37.5 33.9 Example 4 6.0 30.5 36.8 33.1 Comparative Example 1 5.2 12.4 18.6 14.2 Comparative Example 2 5.3 15.8 20.3 16.8 Comparative Example 3 5.5 22.7 28.4 23.5 Comparative Example 4 5.4 20.3 25.6 21.3 Comparative Example 5 5.2 18.9 23.7 19.6

[0092] As can be seen from Table 1, examples 1-4 can effectively increase the soil pH to above 6.0, with an organic matter growth rate of 30.5%-35.6%, an available phosphorus growth rate of 36.8%-38.3%, and a rice yield growth rate of 33.1%-38.7%, which are significantly better than all comparative examples. Among them, example 1 has the best effect, indicating that the components such as Enteromorpha-based biochar, diatomite and silica sol have a significant synergistic effect of enhancing the effects of acid regulation, carbon increase, phosphorus activation and yield increase. That is, the soil conditioner + green manure crop synergistic method of the present application significantly improves the soil fertility and rice yield of low-yield red-yellow soil.

[0093] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of synergistically improving soil fertility with soil amendment and green manure crop, characterized in that, It comprises the following steps: After rice is harvested, the soil is deep ploughed and dried; The soil conditioner is evenly applied on the surface of the soil, and then green manure crops are planted; In the full-bloom period of the green manure crops, they are ploughed back into the field for decomposition; Finally, rice seedlings are transplanted; The soil conditioner comprises the following raw materials: Enteromorpha-based biochar, diatomite, silica sol, wood ash, calcium hydroxyl phosphate, magnesium sulfate heptahydrate and ferrous sulfate.

2. The method of claim 1, wherein the soil amendment and green manure crop are used in combination to enhance soil fertility, characterized in that, According to the weight fraction, the soil conditioner comprises the following raw materials: Enteromorpha-based biochar 30-50 parts, diatomite 15-25 parts, silica sol 12-18 parts, wood ash 10-20 parts, calcium hydroxyl phosphate 10-15 parts, magnesium sulfate heptahydrate 10-12 parts and ferrous sulfate 8-9 parts.

3. The method of claim 2, wherein the soil amendment and green manure crop are applied simultaneously. According to the weight fraction, the soil conditioner comprises the following raw materials: ​ Enteromorpha-based biochar 30 parts, diatomite 15 parts, silica sol 12 parts, wood ash 10 parts, calcium hydroxyl phosphate 10 parts, magnesium sulfate heptahydrate 12 parts and ferrous sulfate 9 parts.

4. The method of claim 2, wherein the soil amendment and green manure crop are used in combination to enhance soil fertility, characterized in that, According to the weight fraction, the soil conditioner comprises the following raw materials: Enteromorpha-based biochar 42 parts, diatomite 20 parts, silica sol 15 parts, wood ash 16 parts, calcium hydroxyl phosphate 12 parts, magnesium sulfate heptahydrate 11 parts and ferrous sulfate 9 parts.

5. The method of claim 2, wherein the soil amendment is a combination of a soil amendment and a green manure crop. According to the weight fraction, the soil conditioner comprises the following raw materials: Enteromorpha-based biochar 50 parts, diatomite 25 parts, silica sol 18 parts, wood ash 20 parts, calcium hydroxyl phosphate 15 parts, magnesium sulfate heptahydrate 10 parts and ferrous sulfate 8 parts.

6. The method of claim 1, wherein the soil amendment and green manure crop are used in combination to enhance soil fertility. The preparation process of the Enteromorpha-based biochar is as follows: pyrolysis of Enteromorpha under anaerobic conditions at 400-600 DEG C for 2-4 hours to obtain the Enteromorpha-based biochar.

7. The method of claim 1, wherein the soil amendment and green manure crop are used in combination to enhance soil fertility, and wherein the soil amendment is a combination of a soil conditioner and a soil conditioner amendment. The preparation process of the soil conditioner is as follows: Diatomite and wood ash are dried and ground; Under stirring, calcium hydroxyl phosphate, magnesium sulfate heptahydrate and ferrous sulfate are sequentially added to the silica sol, and stirred uniformly to form a liquid mixture; Enteromorpha-based biochar, ground diatomite and wood ash are uniformly mixed to obtain a solid mixture; The liquid mixture is uniformly added to the continuously stirred solid mixture by spraying, and after uniform mixing, the obtained wet material is granulated and dried to prepare the soil conditioner.

8. The method of claim 1, wherein the soil amendment and green manure crop are used in combination to enhance soil fertility. The application amount of the soil conditioner is 200-300 kg / acre.

9. The method of claim 1, wherein the soil amendment and green manure crop are used in combination to enhance soil fertility. Organic fertilizer is also applied at the same time as the soil conditioner, and the application amount is 1000-2000 kg / acre.

10. The method of claim 1, wherein the soil amendment and green manure crop are used in combination to enhance soil fertility. The green manure crop is Chinese milk vetch or vetch; and the seeding amount is 1.5-2.5 kg / acre. The green manure crop is Chinese milk vetch or vetch; and the seeding amount is 1.5-2.5 kg / acre.