Semi-decomposed straw saline-alkali soil improvement fertilizer and application thereof

Abstract

The invention relates to the technical field of organic fertilizers for saline-alkali soil, in particular to a semi-decomposed straw saline-alkali soil improvement fertilizer and application thereof. The straw semi-decomposed saline-alkali soil improvement fertilizer is prepared from the following raw materials in parts by weight: 50-70 parts of semi-decomposed straw, 3-7 parts of humic acid, 30-45 parts of farmyard manure and 2-3 parts of trace element fertilizer, wherein the semi-decomposed straws are obtained by mixing agricultural wastes and a microbial agent and then fermenting; the microbial agent is prepared by mixing a bacillus subtilis bacterial liquid, a pseudomonas bacterial liquid and a serratia bacterial liquid; the volume ratio of the bacillus subtilis liquid to the pseudomonas liquid to the serratia marcescens liquid is (2-3): (2-3): (2-4). The straw semi-decomposed saline-alkali soil improvement fertilizer prepared by the invention can effectively reduce the pH value of saline-alkali soil, and also can increase the yield of wheat in saline-alkali soil.

Description

Technical Field

[0001] The invention relates to the technical field of organic fertilizers for saline-alkali land, and in particular to a semi-decomposed straw saline-alkali land improving fertilizer and application thereof. Background Art

[0002] Saline-alkali land is a type of salt accumulation, which means that the salt content and excessively high pH value in the soil affect the normal growth of crops. According to the utilization of the soil and the salt content and pH value in the soil, saline-alkali land can be divided into light saline-alkali land, moderate saline-alkali land and heavy saline-alkali land. Among them, the soil salt content in light saline-alkali land is less than 3 / 1000, and the pH value is 7.1-8.5. The emergence rate of crops planted on light saline-alkali land is 70-80%; the soil salt content in moderate saline-alkali land is between 3 / 1000 and 6 / 1000, and the pH value is 8.5-9.5. The emergence rate of crops planted on moderate saline-alkali land is 50%-70%; the soil salt content in heavy saline-alkali land exceeds 6 / 1000, and the pH value is above 9.5. The emergence rate of crops planted on heavy saline-alkali land is less than 50%. Natural climatic conditions, geographical conditions, soil texture, groundwater, rivers and seawater can all cause soil salinization and eventually form saline-alkali land.

[0003] Irrigation and salt washing is the most traditional method for improving saline-alkali soil. This method washes out the salt in the soil and reduces the salt content of the soil. It is suitable for areas with sufficient water resources. It is necessary to establish a large-scale drainage and irrigation system, which is costly and easily causes the groundwater level to rise, resulting in soil salt return. Using chemical modifiers to adjust the salinity in the soil is also an effective way to improve it, but excessive application of chemical agents to the soil is likely to cause secondary pollution of the soil. Using biological measures to improve saline-alkali land includes, first, using salt-tolerant plants to directly absorb part of the salt from the soil to reduce the salt content of the soil, but when the dead branches of the plants rot, the large amount of salt contained therein may remain on the surface of the soil. Second, applying microbial modifiers to the soil and using microorganisms to repair saline-alkali soil, but simply using microorganisms for improvement has a long improvement cycle, generally requiring several months, one year, two years or longer. The third is to use traditional hybridization technology and genetic engineering methods to cultivate new salt-resistant varieties and transgenic salt-resistant plants. This method is difficult and costly. In view of this, the present invention needs to provide a more effective product for improving saline-alkali land. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of poor improvement effect and slow speed of saline-alkali land in the prior art, and to provide a semi-decomposed straw saline-alkali land improvement fertilizer and application thereof.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0006] The first aspect of the present invention provides a semi-decomposed straw saline-alkali land improvement fertilizer, which is composed of the following raw materials in parts by weight: 50-70 parts of semi-decomposed straw, 3-7 parts of humic acid, 30-45 parts of farmyard manure, and 2-3 parts of trace element fertilizer;

[0007] Wherein, the semi-decomposed straw is obtained by mixing agricultural waste with microbial agents and then fermenting them;

[0008] The microbial agent is prepared by mixing Bacillus subtilis solution, Pseudomonas solution and Serratia solution; the volume ratio of the Bacillus subtilis solution, Pseudomonas solution and Serratia solution is 2-3:2-3:2-4;

[0009] The effective viable count of the microbial agent is 2.0×10 6 CFU / mL~1.0×10 7 CFU / mL.

[0010] In some technical solutions of the present invention, the agricultural waste includes: wheat straw, corn straw and cotton straw.

[0011] In some technical schemes of the present invention, the method for preparing the semi-decomposed saline-alkali land improving fertilizer comprises: crushing the wheat straw, corn straw and cotton straw and mixing them to obtain a crushed straw mixture; adding the microbial agent to the crushed straw mixture for decomposition to obtain semi-decomposed straw;

[0012] The semi-decomposed straw is uniformly mixed with humic acid, farmyard manure and trace element fertilizer according to weight proportions to obtain a semi-decomposed saline-alkali land improving fertilizer.

[0013] In some technical solutions of the present invention, the fermentation temperature is 28°C to 32°C.

[0014] In some technical solutions of the present invention, the fermentation period is 5 to 8 days.

[0015] In some technical solutions of the present invention, 3 mL to 5 mL of the microbial agent is added to each kilogram of the crushed straw mixture.

[0016] In some technical solutions of the present invention, the moisture content of the crushed straw mixture is 50%-60%.

[0017] In some technical solutions of the present invention, the weight ratio of the wheat straw, corn straw and cotton straw is 3-5:1-2:4-6.

[0018] The second aspect of the present invention provides the use of the semi-decomposed straw saline-alkali land improving fertilizer in improving saline-alkali land soil.

[0019] In some technical solutions of the present invention, the semi-decomposed straw saline-alkali land improving fertilizer is applied to the saline-alkali soil before crop planting, with 60kg to 75kg applied per 100 square meters.

[0020] The third aspect of the present invention provides the use of the semi-decomposed straw saline-alkali land improving fertilizer in increasing the yield of crops in saline-alkali land.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The semi-decomposed saline-alkali land improving fertilizer provided by the present invention uses Bacillus subtilis, Pseudomonas and Serratia as microbial agents to prepare semi-decomposed straw, which can rapidly degrade the straw in a short time and promote rapid straw composting fermentation.

[0023] The semi-decomposed straw saline-alkali land improving fertilizer provided in the present invention is prepared by mixing the semi-decomposed straw with humic acid, farmyard manure and trace element fertilizer, wherein the semi-decomposed straw is prepared by mixing wheat straw, corn straw and cotton straw as raw materials, and Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid are used as microbial agents, and the mixture is fermented. The use of the semi-decomposed straw provided in the present invention to prepare the saline-alkali land improving fertilizer can effectively reduce the pH value of saline-alkali soil in a short time, and experiments have found that the fertilizer can also increase the yield of wheat in saline-alkali land.

[0024] The preparation method of the semi-decomposed straw saline-alkali land improvement fertilizer provided by the present invention is simple, and can avoid secondary pollution of the soil caused by the use of chemical improvers. The fertilizer raw material cost prepared by the method of the present invention is low, and the preparation difficulty is less than that of using traditional hybridization technology and genetic engineering methods to cultivate new salt-resistant varieties and transgenic salt-resistant plants.

[0025] The use of the semi-decomposed saline-alkali land improved fertilizer provided by the invention can also increase the yield of wheat planted in salinity. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with specific examples, but it should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the following examples are conventional means well known to those skilled in the art, and the materials, reagents, etc. used in the following examples, unless otherwise specified, can be obtained from commercial sources.

[0027] Saline-alkali land is a type of salt accumulation, which means that the salt content and high pH value in the soil affect the normal growth of crops. Irrigation and salt washing is the most traditional method of improving saline-alkali soil. This method washes out the salt in the soil and reduces the salt content of the soil. It is suitable for areas with sufficient water resources. It requires the establishment of a large-scale drainage and irrigation system, which is costly and easily causes the groundwater level to rise and cause soil salt to return. Using chemical amendments to adjust the salinity in the soil is also an effective way to improve it, but excessive application of chemical agents to the soil is likely to cause secondary pollution of the soil. Using biological measures to improve saline-alkali land includes, first, using salt-tolerant plants to directly absorb part of the salt from the soil to reduce the salt content of the soil, but when the dead branches of the plants rot, the large amount of salt contained in them may remain on the surface of the soil. Second, applying microbial amendments to the soil and using microorganisms to repair saline-alkali soil, but the improvement cycle of using microorganisms alone is relatively long. Third, using traditional hybridization technology and genetic engineering methods to cultivate new salt-resistant varieties and transgenic salt-resistant plants, this method is difficult and costly.

[0028] The present invention provides a semi-decomposed straw saline-alkali land improvement fertilizer, which is composed of the following raw materials in parts by weight: 50-70 parts of semi-decomposed straw, 3-7 parts of humic acid, 30-45 parts of farmyard manure, and 2-3 parts of trace element fertilizer;

[0029] Wherein, the semi-decomposed straw is obtained by mixing agricultural waste with microbial agents and then fermenting them;

[0030] The microbial agent is prepared by mixing Bacillus subtilis solution, Pseudomonas solution and Serratia solution; the volume ratio of the Bacillus subtilis solution, Pseudomonas solution and Serratia solution is 2-3:2-3:2-4;

[0031] The effective viable count of the microbial agent is 2.0×10 6 CFU / mL~1.0×10 7 CFU / mL.

[0032] The semi-decomposed straw saline-alkali land improvement fertilizer provided in the present invention is prepared from wheat straw, corn straw and cotton straw as raw materials, and Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid as microbial agents to prepare the semi-decomposed straw. The microbial agent used in the present invention can rapidly degrade the straw in a short time and promote the rapid fermentation of straw composting. The use of the semi-decomposed straw provided in the present invention to prepare the saline-alkali land improvement fertilizer can effectively reduce the pH value of saline-alkali soil in a short time, and experiments have found that the fertilizer can also increase the yield of wheat in saline-alkali land.

[0033] The present invention also provides a method for preparing a semi-decomposed straw saline-alkali land improving fertilizer. The preparation method is simple to operate, and the fertilizer raw material cost prepared by the method of the present invention is low and the preparation difficulty is relatively low.

[0034] Experimental Materials:

[0035] Bacillus subtilis was purchased from China Center for Type Culture Collection with a deposit number of CCTCC AB 130027; Pseudomonas was purchased from China Center for Type Culture Collection with a deposit number of CCTCC AB 2010332; and Serratia was purchased from China Center for Type Culture Collection with a deposit number of CCTCC AB 209032T.

[0036] Example 1: A semi-mature straw fertilizer for improving saline-alkali land

[0037] 1. A semi-decomposed saline-alkali land improving fertilizer made of straw is composed of the following raw materials in parts by weight:

[0038] 60kg semi-decomposed straw, 7kg humic acid, 30kg farmyard manure, and 3kg trace element fertilizer.

[0039] 2. A method for preparing a semi-mature saline-alkali land improving fertilizer comprises the following steps:

[0040] (1) Wheat straw, corn straw, and cotton straw were mixed in a weight ratio of 2:2:6, crushed to 0.5 cm, and a straw mixture was obtained. The straw mixture was mixed with water in a volume ratio of 4:1 to obtain a fermentation raw material.

[0041] (2) Inoculate 5 mL of microbial agent per kilogram of fermentation raw material weight, and sprinkle water on the fermentation raw material inoculated with the microbial agent to make the moisture content of the fermentation raw material reach 50%, ferment at 30°C for 7 days, turn the material once every 2 days during the fermentation period, and obtain semi-mature straw. The microbial agent includes: a mixture of Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid in a volume ratio of 3:2:4. The number of effective live bacteria in the microbial agent is 2.0×10 6 CFU / mL.

[0042] The preparation methods of Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid are as follows: Bacillus subtilis, Pseudomonas liquid and Serratia liquid are inoculated into LB liquid culture medium respectively, and cultured at 30° C. for 5 days.

[0043] (3) The semi-decomposed straw was mixed with humic acid, farmyard manure, and trace element fertilizer (purchased from Hebei Knox Fertilizer Co., Ltd.) according to the weight ratio of 60 kg of semi-decomposed straw, 7 kg of humic acid, 30 kg of farmyard manure, and 3 kg of trace element fertilizer to obtain a mixture, and the pH of the mixture was adjusted to 6.0 using a wood ash aqueous solution to obtain a semi-decomposed saline-alkali land improvement fertilizer.

[0044] Example 2: A semi-decomposed straw fertilizer for improving saline-alkali land

[0045] 1. A semi-decomposed saline-alkali land improving fertilizer made of straw is composed of the following raw materials in parts by weight:

[0046] 50kg semi-decomposed straw, 5kg humic acid, 40kg farmyard manure, and 2kg trace element fertilizer.

[0047] 2. A method for preparing a semi-mature saline-alkali land improving fertilizer comprises the following steps:

[0048] (1) Wheat straw, corn straw, and cotton straw were mixed in a weight ratio of 3:1:4, crushed to 0.5 cm, and a straw mixture was obtained. The straw mixture was mixed with water in a volume ratio of 4:1 to obtain a fermentation raw material.

[0049] (2) Inoculate 3 mL of microbial agent per kilogram of fermentation raw material weight, and sprinkle water on the fermentation raw material inoculated with the microbial agent to make the moisture content of the fermentation raw material reach 55%, ferment at 30°C for 7 days, turn the material once every 2 days during the fermentation period, and obtain semi-mature straw. The microbial agent includes: a mixture of Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid in a volume ratio of 3:3:2. The number of effective live bacteria in the microbial agent is 2.0×10 6 CFU / mL.

[0050] The preparation methods of Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid are as follows: Bacillus subtilis, Pseudomonas liquid and Serratia liquid are inoculated into LB liquid culture medium respectively, and cultured at 30° C. for 5 days.

[0051] (3) The semi-decomposed straw is mixed with humic acid, farmyard manure, and trace element fertilizer according to the weight proportions of 60 kg of semi-decomposed straw, 7 kg of humic acid, 30 kg of farmyard manure, and 3 kg of trace element fertilizer to obtain a mixture, and the pH of the mixture is adjusted to 6.0 using a wood ash aqueous solution to obtain a semi-decomposed saline-alkali land improvement fertilizer.

[0052] Example 3: A semi-decomposed straw fertilizer for improving saline-alkali land

[0053] 1. A semi-decomposed saline-alkali land improving fertilizer made of straw is composed of the following raw materials in parts by weight:

[0054] 70kg semi-decomposed straw, 6kg humic acid, 45kg farmyard manure, and 3kg trace element fertilizer.

[0055] 2. A method for preparing a semi-mature saline-alkali land improving fertilizer comprises the following steps:

[0056] (1) Wheat straw, corn straw, and cotton straw were mixed in a weight ratio of 5:2:5, crushed to 0.5 cm, and a straw mixture was obtained. The straw mixture was mixed with water in a volume ratio of 4:1 to obtain a fermentation raw material.

[0057] (2) Inoculate 4 mL of microbial agent per kilogram of fermentation raw material weight, and sprinkle water on the fermentation raw material inoculated with the microbial agent to make the moisture content of the fermentation raw material reach 60%, ferment at 30°C for 7 days, turn the material once every 2 days during the fermentation period, and obtain semi-mature straw. The microbial agent includes: a mixture of Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid in a volume ratio of 2:3:2. The number of effective live bacteria in the microbial agent is 1.0×10 7 CFU / mL.

[0058] The preparation methods of Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid are as follows: Bacillus subtilis, Pseudomonas liquid and Serratia liquid are inoculated into LB liquid culture medium respectively, and cultured at 30° C. for 5 days.

[0059] (3) The semi-decomposed straw is mixed with humic acid, farmyard manure, and trace element fertilizer according to the weight proportions of 60 kg of semi-decomposed straw, 7 kg of humic acid, 30 kg of farmyard manure, and 3 kg of trace element fertilizer to obtain a mixture, and the pH of the mixture is adjusted to 6.0 using a wood ash aqueous solution to obtain a semi-decomposed saline-alkali land improvement fertilizer.

[0060] Comparative Example 1:

[0061] Compared with Example 1, the difference is that the microbial agent used in the preparation process does not contain Pseudomonas bacterial liquid, as described in detail below.

[0062] 1. A semi-decomposed saline-alkali land improving fertilizer made of straw is composed of the following raw materials in parts by weight:

[0063] 60kg semi-decomposed straw, 7kg humic acid, 30kg farmyard manure, and 3kg trace element fertilizer.

[0064] 2. A method for preparing a semi-mature saline-alkali land improving fertilizer comprises the following steps:

[0065] (1) Wheat straw, corn straw, and cotton straw were mixed in a weight ratio of 2:2:6, crushed to 0.5 cm, and a straw mixture was obtained. The straw mixture was mixed with water in a volume ratio of 4:1 to obtain a fermentation raw material.

[0066] (2) Inoculate 5 mL of microbial agent per kilogram of fermentation raw material weight, sprinkle water on the fermentation raw material inoculated with the microbial agent to make the moisture content of the fermentation raw material reach 50%, ferment at 30°C for 7 days, turn the material once every 2 days during the fermentation period, and obtain semi-mature straw. The microbial agent includes: a mixture of Bacillus subtilis liquid and Serratia liquid in a volume ratio of 3:4. The number of effective live bacteria in the microbial agent is 2.0×10 6 CFU / mL.

[0067] The preparation methods of Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid are as follows: Bacillus subtilis, Pseudomonas liquid and Serratia liquid are inoculated into LB liquid culture medium respectively, and cultured at 30° C. for 5 days.

[0068] (3) The semi-decomposed straw is uniformly mixed with humic acid, farmyard manure, and trace element fertilizer according to the weight proportions of 60 kg of semi-decomposed straw, 7 kg of humic acid, 30 kg of farmyard manure, and 3% of trace element fertilizer to obtain a mixture, and the pH of the mixture is adjusted to 6.0 using a wood ash aqueous solution to obtain a semi-decomposed saline-alkali land improvement fertilizer.

[0069] Comparative Example 2:

[0070] Compared with Example 1, the difference is that the microbial agent used in the preparation process does not contain Serratia liquid, as described below.

[0071] 1. A semi-decomposed saline-alkali land improving fertilizer made of straw is composed of the following raw materials in parts by weight:

[0072] 60kg semi-decomposed straw, 7kg humic acid, 30kg farmyard manure, and 3kg trace element fertilizer.

[0073] 2. A method for preparing a semi-mature saline-alkali land improving fertilizer comprises the following steps:

[0074] (1) Wheat straw, corn straw, and cotton straw were mixed in a weight ratio of 2:2:6, crushed to 0.5 cm, and a straw mixture was obtained. The straw mixture was mixed with water in a volume ratio of 4:1 to obtain a fermentation raw material.

[0075] (2) Inoculate 5 mL of microbial agent per kilogram of fermentation raw material weight, and sprinkle water on the fermentation raw material inoculated with the microbial agent to make the moisture content of the fermentation raw material reach 50%, ferment at 30°C for 7 days, turn the material once every 2 days during the fermentation period, and obtain semi-mature straw. The microbial agent includes: a mixture of Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid in a volume ratio of 3:4. The number of effective live bacteria in the microbial agent is 2.0×10 6 CFU / mL.

[0076] The preparation methods of Bacillus subtilis liquid, Pseudomonas liquid and Serratia liquid are as follows: Bacillus subtilis, Pseudomonas liquid and Serratia liquid are inoculated into LB liquid culture medium respectively, and cultured at 30° C. for 5 days.

[0077] (3) The semi-decomposed straw is uniformly mixed with humic acid, farmyard manure, and trace element fertilizer according to the weight proportions of 60 kg of semi-decomposed straw, 7 kg of humic acid, 30 kg of farmyard manure, and 3% of trace element fertilizer to obtain a mixture, and the pH of the mixture is adjusted to 6.0 using a wood ash aqueous solution to obtain a semi-decomposed saline-alkali land improvement fertilizer.

[0078] Example 4

[0079] Six treatment groups were set up, each of which occupied 100 square meters and was sown in saline-alkali land. The method of using the fertilizers prepared in the embodiments and comparative examples is as follows: evenly spread on the surface before wheat cultivation and then plow into the soil, 70 kg of fertilizer was applied to each test area, and urea was not applied; the blank control group refers to no application of any fertilizer. The pH value of the soil and the yield of wheat were tested during sowing and after wheat harvest.

[0080] (1) Yield survey: Five 2-square-meter plots were randomly selected for each treatment group. The grain yield was measured after harvesting and the yield increase efficiency of each treatment group was calculated.

[0081] Yield increase % = (total yield of experimental group - total yield of blank control group) / total yield of blank control group × 100

[0082] (3) Soil acidity and alkalinity survey:

[0083] The soil pH of each treatment group was measured at sowing and harvest. Twenty points were selected along the diagonal of each plot for each treatment group, and the soil pH was directly read on a pH meter using the potentiometric method.

[0084] The experimental results are shown in Table 1, which shows that the fertilizers prepared by using Examples 1-3 of the present invention can well reduce the pH value in saline-alkali soil and are beneficial to the yield of wheat.

[0085] Table 1 Wheat yield increase rate and soil pH value in different treatment groups

[0086]

[0087] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0088] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A semi-decomposed straw fertilizer for improving saline-alkali land. It is characterized in that The method is composed of the following raw materials in parts by weight: 50-70 parts of semi-decomposed straw, 3-7 parts of humic acid, 30-45 parts of farmyard manure, and 2-3 parts of trace element fertilizer; Wherein, the semi-decomposed straw is obtained by mixing agricultural waste with microbial agents and then fermenting them; The microbial agent is prepared by mixing Bacillus subtilis solution, Pseudomonas solution and Serratia solution; the volume ratio of the Bacillus subtilis solution, Pseudomonas solution and Serratia solution is 2-3:2-3:2-4; The effective viable count of the microbial agent is 2.0×10 6 CFU / mL~1.0×10 7 CFU / mL.

2. The semi-decomposed saline-alkali land improving fertilizer of straw according to claim 1, It is characterized in that The agricultural waste includes wheat straw, corn straw and cotton straw.

3. The semi-decomposed saline-alkali land improving fertilizer of straw according to claim 2, It is characterized in that The method for preparing the semi-decomposed straw fertilizer for improving saline-alkali land comprises: crushing the wheat straw, corn straw and cotton straw and mixing them to obtain a crushed straw mixture; adding the microbial agent to the crushed straw mixture for decomposition to obtain semi-decomposed straw; The semi-decomposed straw is uniformly mixed with humic acid, farmyard manure and trace element fertilizer according to weight proportions to obtain a semi-decomposed saline-alkali land improving fertilizer.

4. The semi-decomposed saline-alkali land improving fertilizer of straw according to claim 3, It is characterized in that The composting temperature is 28°C to 32°C, and the composting days are 5 to 8 days.

5. The semi-decomposed saline-alkali land improving fertilizer of straw according to claim 3, It is characterized in that 3 mL to 5 mL of the microbial agent is added to each kilogram of the crushed straw mixture.

6. The semi-decomposed saline-alkali land improving fertilizer of straw according to claim 3, It is characterized in that The moisture content of the crushed straw mixture is 50%-60%.

7. The semi-decomposed saline-alkali land improving fertilizer of straw according to claim 3, It is characterized in that The weight ratio of the wheat straw, corn straw and cotton straw is 3-5:1-2:4-6.

8. Use of the semi-decomposed saline-alkali land improving fertilizer of straw as claimed in claim 1 in improving saline-alkali land soil.

9. The use according to claim 8, It is characterized in that Before planting crops, the semi-decomposed straw saline-alkali land improving fertilizer is applied to the saline-alkali soil, with 60kg to 75kg applied per 100 square meters.

10. Use of the semi-decomposed saline-alkali land improving fertilizer of straw as claimed in claim 1 in increasing the yield of crops in saline-alkali land.

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