A compound fertilizer for saline-alkali soil and a preparation method thereof

Abstract

The present application relates to the technical field of compound fertilizer, in particular to a kind of compound fertilizer for saline-alkali soil and preparation method thereof, the compound fertilizer includes the following weight parts raw materials: cow dung 35~40 parts, 15~20 parts sodium humate, modified zeolite molecular sieve agent 7~11 parts, 4~7 parts based on shell powder regulator, 3~5 parts trace elements and 4~7 parts inorganic fertilizer.The present application is prepared by the compound fertilizer for saline-alkali soil using cow dung, sodium humate, trace elements and inorganic fertilizer, while adding modified zeolite molecular sieve agent and shell powder-based regulator to optimize each other, through the synergistic effect of raw materials, the compound fertilizer can optimize the yield and growth quality of plant in saline-alkali soil, and can adjust the physicochemical properties of soil.

Description

Technical Field

[0001] This invention relates to the field of compound fertilizer technology, specifically to a compound fertilizer for saline-alkali land and its preparation method. Background Technology

[0002] Saline-alkali soil is a general term encompassing saline soil, alkaline soil, and various salinized and alkalized soils. Saline soil refers to soil with a soluble salt content reaching a certain level that can significantly harm plant growth and development. Alkaline soil refers to soil containing a large number of exchangeable ions, sufficient to harm plant growth and development and altering soil properties. Existing compound fertilizers, when used in saline-alkali land, are difficult to effectively improve corn yield, have low effects on improving soil physicochemical properties, and generally only moderately improve corn growth quality, thus limiting the efficiency of compound fertilizer use. Therefore, this invention provides further improvements. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the purpose of this invention is to provide a compound fertilizer for saline-alkali land and its preparation method, so as to solve the problems mentioned in the background art.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] This invention provides a compound fertilizer for saline-alkali land, which comprises the following raw materials in parts by weight: 35-40 parts cow manure, 15-20 parts sodium humate, 7-11 parts modified zeolite molecular sieve agent, 4-7 parts shell powder-based regulator, 3-5 parts trace elements, and 4-7 parts inorganic fertilizer.

[0006] Preferably, the trace element is one or more of the following: fulvic acid chelated zinc, fulvic acid chelated iron, fulvic acid chelated manganese, and fulvic acid chelated boron; the inorganic fertilizer is a compound of nitrogen, phosphorus, and potassium in a weight ratio of 3:2:2.

[0007] The cow manure material is made by mixing cow manure, water, and straw ash in a weight ratio of 5:3:3, then adding 15-25% of Bacillus subtilis to the total cow manure, and fermenting at 40-45℃ for 12 days. After fermentation, the cow manure material is obtained.

[0008] Preferably, the modified zeolite molecular sieve agent is prepared by:

[0009] S01: Stir the zeolite molecular sieve in a sufficient amount of sodium hydroxide solution, then wash with water, filter and dry. Preheat the dried zeolite molecular sieve at 55-60℃ for 1 hour to obtain the preheated zeolite molecular sieve.

[0010] SO2: Preparation of modified liquid:

[0011] S02a: Illite, hydrotalcite and sodium silicate solution were mixed and ball-milled at a weight ratio of (5-8):(3-5):2. The ball milling speed was 1000-1500 r / min and the ball milling time was 2 h. After the ball milling was completed, illite solution was obtained.

[0012] S02b: 3-5 parts metakaolin, 1-2 parts silane coupling agent and 1-2 parts nano silica sol are mixed and added to 5-8 parts illite liquid and stirred evenly to obtain the modified liquid;

[0013] S03: The preheated zeolite molecular sieve and the modified liquid are stirred and modified at a weight ratio of 4:(7-9). After stirring, the modified zeolite molecular sieve liquid is obtained.

[0014] The modified zeolite molecular sieve liquid and additives were mixed and ball-milled at a weight ratio of (7-11):5. The ball milling speed was 1050-1100 r / min and the milling time was 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain the modified zeolite molecular sieve agent.

[0015] Preferably, the sodium hydroxide solution has a mass fraction of 5-8%; the sodium silicate solution has a mass fraction of 5-8%; and the silane coupling agent is silane coupling agent KH560.

[0016] Preferably, the stirring temperature for the stirring modification treatment is 55-60℃, the stirring speed is 750-850 r / min, and the stirring time is 1 h.

[0017] Preferably, the additive is prepared by:

[0018] Mix 3-5 parts wollastonite, 2-4 parts nanocellulose and 5-8 parts modified betaine solution thoroughly, then filter and dry to obtain the additive; wherein the modified betaine solution is obtained by immersing alkylamide betaine in β-cyclodextrin solution thoroughly.

[0019] Preferably, the immersion power for sufficient immersion is 350-400W, and the immersion time is 1 hour; the β-cyclodextrin solution is prepared by mixing β-cyclodextrin, silane coupling agent KH550, and an 85% ethanol aqueous solution in a weight ratio of 3:1:5.

[0020] Preferably, the preparation method of the shell powder-based regulator is as follows:

[0021] S11: Mix 2-5 parts shell powder, 1-3 parts carboxymethyl cellulose and 5-8 parts of sodium lignosulfonate solution with a mass fraction of 8% to obtain shell powder solution;

[0022] Add 3-6 parts of nano-titanium oxide and 1-3 parts of silicon carbide to 5-8 parts of phosphate buffer solution with a pH of 5.5, stir thoroughly, and obtain the additive solution;

[0023] S102: The additive liquid and shell powder liquid are ultrasonically treated at a weight ratio of 2:5, with an ultrasonic power of 350-400W for 1 hour. After ultrasonication, the mixture is filtered and dried to obtain a shell powder-based regulator.

[0024] This invention also provides a method for preparing a compound fertilizer for saline-alkali land, comprising the following steps:

[0025] Weigh the raw materials according to the specified weight proportions, stir and process the raw materials to obtain the compound fertilizer for saline-alkali land of the present invention.

[0026] Preferably, the stirring speed of the stirring process is 1050-1250 r / min, and the stirring time is 1 h.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] This invention relates to a compound fertilizer for saline-alkali land, which uses cow manure, sodium humate, trace elements, and inorganic fertilizers. Modified zeolite molecular sieve agents and shell powder-based regulators are added for mutual blending and optimization. Through the synergistic effect of the raw materials, the resulting compound fertilizer can optimize plant yield and growth quality in saline-alkali land, while also regulating the physical and chemical properties of the soil. The modified zeolite molecular sieve agent is made by blending zeolite molecular sieves with sodium hydroxide solution, and further optimized by adding a modifying liquid and stirring. The metakaolin, silane coupling agent, nano-silica sol, and illite liquid in the modifying liquid are mutually blended and optimized. The illite, hydrotalcite, and sodium silicate solution in the illite liquid are ball-milled for further optimization. Using metakaolin as the matrix, the zeolite molecular sieve agent optimizes the compatibility of the raw materials and the physical and chemical properties of the soil within the product system. Further improvements and optimizations were made using additives. The additives consisted of wollastonite, nanocellulose, and modified betaine solution, with the alkylamide betaine in the modified betaine solution blending with β-cyclodextrin solution. This synergistic effect of the raw materials, particularly the β-cyclodextrin and alkylamide betaine in the modified betaine solution, interacted with wollastonite and nanocellulose, allowing the additive to further enhance its effect on soil materials and improve system performance. The shell powder-based regulator used shell powder blended with carboxymethyl cellulose and other raw materials, along with nano-titanium oxide and silicon carbide in a phosphate buffer solution as the additive. Through the co-blending and blending of these raw materials, the resulting shell powder-based regulator exhibited better synergistic effects with the modified zeolite molecular sieve agent, further improving product performance. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This embodiment provides a compound fertilizer for saline-alkali land, comprising the following raw materials in parts by weight: 35-40 parts cow manure, 15-20 parts sodium humate, 7-11 parts modified zeolite molecular sieve agent, 4-7 parts shell powder-based regulator, 3-5 parts trace elements, and 4-7 parts inorganic fertilizer.

[0031] The trace elements in this embodiment are one or more combinations of fulvic acid chelated zinc, fulvic acid chelated iron, fulvic acid chelated manganese, and fulvic acid chelated boron; the inorganic fertilizer is a compound of nitrogen, phosphorus, and potassium in a weight ratio of 3:2:2.

[0032] The cow manure material is made by mixing cow manure, water, and straw ash in a weight ratio of 5:3:3, then adding 15-25% of Bacillus subtilis to the total cow manure, and fermenting at 40-45℃ for 12 days. After fermentation, the cow manure material is obtained.

[0033] The preparation method of the modified zeolite molecular sieve agent in this embodiment is as follows:

[0034] S01: Stir the zeolite molecular sieve in a sufficient amount of sodium hydroxide solution, then wash with water, filter and dry. Preheat the dried zeolite molecular sieve at 55-60℃ for 1 hour to obtain the preheated zeolite molecular sieve.

[0035] SO2: Preparation of modified liquid:

[0036] S02a: Illite, hydrotalcite and sodium silicate solution were mixed and ball-milled at a weight ratio of (5-8):(3-5):2. The ball milling speed was 1000-1500 r / min and the ball milling time was 2 h. After the ball milling was completed, illite solution was obtained.

[0037] S02b: 3-5 parts metakaolin, 1-2 parts silane coupling agent and 1-2 parts nano silica sol are mixed and added to 5-8 parts illite liquid and stirred evenly to obtain the modified liquid;

[0038] S03: The preheated zeolite molecular sieve and the modified liquid are stirred and modified at a weight ratio of 4:(7-9). After stirring, the modified zeolite molecular sieve liquid is obtained.

[0039] The modified zeolite molecular sieve liquid and additives were mixed and ball-milled at a weight ratio of (7-11):5. The ball milling speed was 1050-1100 r / min and the milling time was 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain the modified zeolite molecular sieve agent.

[0040] In this embodiment, the sodium hydroxide solution has a mass fraction of 5-8%; the sodium silicate solution has a mass fraction of 5-8%; and the silane coupling agent is silane coupling agent KH560.

[0041] In this embodiment, the stirring temperature for the stirring modification treatment is 55-60℃, the stirring speed is 750-850 r / min, and the stirring time is 1 h.

[0042] The preparation method of the additive in this embodiment is as follows:

[0043] Mix 3-5 parts wollastonite, 2-4 parts nanocellulose and 5-8 parts modified betaine solution thoroughly, then filter and dry to obtain the additive; wherein the modified betaine solution is obtained by immersing alkylamide betaine in β-cyclodextrin solution thoroughly.

[0044] In this embodiment, the immersion power for sufficient immersion is 350-400W, and the immersion time is 1 hour. The β-cyclodextrin solution is prepared by mixing β-cyclodextrin, silane coupling agent KH550, and an 85% ethanol aqueous solution in a weight ratio of 3:1:5.

[0045] The preparation method of the shell powder-based regulator in this embodiment is as follows:

[0046] S11: Mix 2-5 parts shell powder, 1-3 parts carboxymethyl cellulose and 5-8 parts of sodium lignosulfonate solution with a mass fraction of 8% to obtain shell powder solution;

[0047] Add 3-6 parts of nano-titanium oxide and 1-3 parts of silicon carbide to 5-8 parts of phosphate buffer solution with a pH of 5.5, stir thoroughly, and obtain the additive solution;

[0048] S102: The additive liquid and shell powder liquid are ultrasonically treated at a weight ratio of 2:5, with an ultrasonic power of 350-400W for 1 hour. After ultrasonication, the mixture is filtered and dried to obtain a shell powder-based regulator.

[0049] This embodiment of a method for preparing a compound fertilizer for saline-alkali land includes the following steps:

[0050] Weigh the raw materials according to the specified weight proportions, stir and process the raw materials to obtain the compound fertilizer for saline-alkali land of the present invention.

[0051] In this embodiment, the stirring speed is 1050-1250 r / min, and the stirring time is 1 hour.

[0052] Example 1.

[0053] This embodiment provides a compound fertilizer for saline-alkali land, comprising the following raw materials in parts by weight: 35 parts cow manure, 15 parts sodium humate, 7 parts modified zeolite molecular sieve agent, 4 parts shell powder-based regulator, 3 parts trace elements, and 4 parts inorganic fertilizer.

[0054] The trace elements in this embodiment are one or more combinations of fulvic acid chelated zinc, fulvic acid chelated iron, fulvic acid chelated manganese, and fulvic acid chelated boron; the inorganic fertilizer is a compound of nitrogen, phosphorus, and potassium in a weight ratio of 3:2:2.

[0055] The cow manure material is made by mixing cow manure, water, and straw ash in a weight ratio of 5:3:3, then adding 15% of Bacillus subtilis from the total cow manure content, and fermenting at 40℃ for 12 days. After fermentation, the cow manure material is obtained.

[0056] The preparation method of the modified zeolite molecular sieve agent in this embodiment is as follows:

[0057] S01: The zeolite molecular sieve is stirred thoroughly in a sufficient amount of sodium hydroxide solution, then washed with water, filtered, and dried. The dried zeolite molecular sieve is preheated at 55°C for 1 hour to obtain the preheated zeolite molecular sieve.

[0058] SO2: Preparation of modified liquid:

[0059] S02a: Illite, hydrotalcite and sodium silicate solution were mixed and ball-milled at a weight ratio of 5:3:2. The ball milling speed was 1000 r / min and the ball milling time was 2 h. After the ball milling was completed, illite liquid was obtained.

[0060] S02b: 3 parts metakaolin, 1 part silane coupling agent and 1 part nano silica sol are mixed and added to 5 parts illite liquid and stirred evenly to obtain the modified liquid;

[0061] S03: The preheated zeolite molecular sieve and the modified liquid are stirred and modified at a weight ratio of 4:7. After stirring, the modified zeolite molecular sieve liquid is obtained.

[0062] The modified zeolite molecular sieve liquid and additives were mixed and ball-milled at a weight ratio of 7:5 for 2 hours at a speed of 1050 r / min. After the ball milling was completed, the mixture was filtered and dried to obtain the modified zeolite molecular sieve agent.

[0063] In this embodiment, the sodium hydroxide solution has a mass fraction of 5%; the sodium silicate solution has a mass fraction of 5%; and the silane coupling agent is silane coupling agent KH560.

[0064] In this embodiment, the stirring temperature for the stirring modification treatment is 55°C, the stirring speed is 750 rpm, and the stirring time is 1 hour.

[0065] The preparation method of the additive in this embodiment is as follows:

[0066] Three parts of wollastonite, two parts of nanocellulose and five parts of modified betaine solution were mixed and stirred thoroughly, then filtered and dried to obtain the additive; wherein the modified betaine solution was obtained by immersing alkylamide betaine in β-cyclodextrin solution.

[0067] In this embodiment, the immersion power for sufficient immersion is 350W, and the immersion time is 1 hour. The β-cyclodextrin solution is prepared by mixing β-cyclodextrin, silane coupling agent KH550, and an 85% ethanol aqueous solution in a weight ratio of 3:1:5.

[0068] The preparation method of the shell powder-based regulator in this embodiment is as follows:

[0069] S11: Mix 2 parts shell powder, 1 part carboxymethyl cellulose and 5 parts sodium lignosulfonate solution with 8% by mass to obtain shell powder solution;

[0070] Three parts of nano-titanium oxide and one part of silicon carbide were mixed and added to five parts of phosphate buffer solution with a pH of 5.5. The mixture was stirred thoroughly to obtain the additive solution.

[0071] S102: The additive liquid and shell powder liquid are ultrasonically treated at a weight ratio of 2:5, the ultrasonic power is 350W, the ultrasonic treatment lasts for 1 hour, after ultrasonic treatment is completed, the mixture is filtered and dried to obtain a shell powder-based regulator.

[0072] This embodiment of a method for preparing a compound fertilizer for saline-alkali land includes the following steps:

[0073] Weigh the raw materials according to the specified weight proportions, stir and process the raw materials to obtain the compound fertilizer for saline-alkali land of the present invention.

[0074] In this embodiment, the stirring speed is 1050 r / min, and the stirring time is 1 h.

[0075] Example 2.

[0076] This embodiment provides a compound fertilizer for saline-alkali land, comprising the following raw materials in parts by weight: 40 parts cow manure, 20 parts sodium humate, 11 parts modified zeolite molecular sieve agent, 7 parts shell powder-based regulator, 5 parts trace elements, and 7 parts inorganic fertilizer.

[0077] The trace element in this embodiment is fulvic acid chelated zinc; the inorganic fertilizer is a compound of nitrogen, phosphorus and potassium in a weight ratio of 3:2:2.

[0078] The cow manure material is made by mixing cow manure, water, and straw ash in a weight ratio of 5:3:3, then adding 25% of the total cow manure with Bacillus subtilis, and fermenting at 45℃ for 12 days. After fermentation, the cow manure material is obtained.

[0079] The preparation method of the modified zeolite molecular sieve agent in this embodiment is as follows:

[0080] S01: The zeolite molecular sieve is stirred thoroughly in a sufficient amount of sodium hydroxide solution, then washed with water, filtered, and dried. The dried zeolite molecular sieve is preheated at 60°C for 1 hour to obtain the preheated zeolite molecular sieve.

[0081] SO2: Preparation of modified liquid:

[0082] S02a: Illite, hydrotalcite and sodium silicate solution were mixed and ball-milled at a weight ratio of 8:5:2. The ball milling speed was 1500 r / min and the ball milling time was 2 h. After the ball milling was completed, illite solution was obtained.

[0083] S02b: 5 parts metakaolin, 2 parts silane coupling agent and 2 parts nano silica sol were mixed and added to 8 parts illite liquid and stirred evenly to obtain the modified liquid;

[0084] S03: The preheated zeolite molecular sieve and the modified liquid are stirred and modified at a weight ratio of 4:9. After stirring, the modified zeolite molecular sieve liquid is obtained.

[0085] The modified zeolite molecular sieve liquid and additives were mixed and ball-milled at a weight ratio of 11:5 for 2 hours at a speed of 1100 r / min. After the ball milling was completed, the mixture was filtered and dried to obtain the modified zeolite molecular sieve agent.

[0086] In this embodiment, the sodium hydroxide solution has a mass fraction of 8%; the sodium silicate solution has a mass fraction of 8%; and the silane coupling agent is silane coupling agent KH560.

[0087] In this embodiment, the stirring temperature for the stirring modification treatment is 60℃, the stirring speed is 850r / min, and the stirring time is 1h.

[0088] The preparation method of the additive in this embodiment is as follows:

[0089] Five parts of wollastonite, four parts of nanocellulose and eight parts of modified betaine solution were mixed and stirred thoroughly, then filtered and dried to obtain the additive; the modified betaine solution was obtained by immersing alkylamide betaine in β-cyclodextrin solution.

[0090] In this embodiment, the immersion power for sufficient immersion is 400W, and the immersion time is 1 hour. The β-cyclodextrin solution is prepared by mixing β-cyclodextrin, silane coupling agent KH550, and an 85% ethanol aqueous solution in a weight ratio of 3:1:5.

[0091] The preparation method of the shell powder-based regulator in this embodiment is as follows:

[0092] S11: Mix 5 parts shell powder, 3 parts carboxymethyl cellulose and 8 parts sodium lignosulfonate solution (8% by mass) thoroughly to obtain shell powder solution;

[0093] Six parts of nano-titanium oxide and three parts of silicon carbide were mixed and added to eight parts of phosphate buffer solution with a pH of 5.5. The mixture was stirred thoroughly to obtain the additive solution.

[0094] S102: The additive liquid and shell powder liquid are ultrasonically treated at a weight ratio of 2:5, the ultrasonic power is 400W, the ultrasonic treatment lasts for 1 hour, after ultrasonic treatment is completed, the mixture is filtered and dried to obtain a shell powder-based regulator.

[0095] This embodiment of a method for preparing a compound fertilizer for saline-alkali land includes the following steps:

[0096] Weigh the raw materials according to the specified weight proportions, stir and process the raw materials to obtain the compound fertilizer for saline-alkali land of the present invention.

[0097] In this embodiment, the stirring speed is 1250 r / min, and the stirring time is 1 h.

[0098] Example 3.

[0099] This embodiment provides a compound fertilizer for saline-alkali land, comprising the following raw materials in parts by weight: 37.5 parts cow manure, 17.5 parts sodium humate, 9 parts modified zeolite molecular sieve agent, 5.5 parts shell powder-based regulator, 4 parts trace elements, and 5.5 parts inorganic fertilizer.

[0100] The trace element in this embodiment is humic acid chelated iron; the inorganic fertilizer is composed of nitrogen, phosphorus and potassium in a weight ratio of 3:2:2.

[0101] The cow manure material is made by mixing cow manure, water, and straw ash in a weight ratio of 5:3:3, then adding 20% ​​of the total cow manure with Bacillus subtilis, and fermenting at 42.5℃ for 12 days. After fermentation, the cow manure material is obtained.

[0102] The preparation method of the modified zeolite molecular sieve agent in this embodiment is as follows:

[0103] S01: The zeolite molecular sieve is stirred thoroughly in a sufficient amount of sodium hydroxide solution, then washed with water, filtered, and dried. The dried zeolite molecular sieve is preheated at 57.5℃ for 1 hour to obtain the preheated zeolite molecular sieve.

[0104] SO2: Preparation of modified liquid:

[0105] S02a: Illite, hydrotalcite and sodium silicate solution were mixed and ball-milled at a weight ratio of 6.5:4:2 at a speed of 1250 r / min for 2 h. After ball milling, illite solution was obtained.

[0106] S02b: 4 parts metakaolin, 1.5 parts silane coupling agent and 1.5 parts nano silica sol are mixed and added to 5-8 parts illite liquid and stirred evenly to obtain the modified liquid;

[0107] S03: The preheated zeolite molecular sieve and the modified liquid are stirred and modified at a weight ratio of 4:8. After stirring, the modified zeolite molecular sieve liquid is obtained.

[0108] The modified zeolite molecular sieve liquid and additives were mixed and ball-milled at a weight ratio of 9:5 for 2 hours at a speed of 1070 r / min. After the ball milling was completed, the mixture was filtered and dried to obtain the modified zeolite molecular sieve agent.

[0109] In this embodiment, the sodium hydroxide solution has a mass fraction of 6.5%; the sodium silicate solution has a mass fraction of 6.5%; and the silane coupling agent is silane coupling agent KH560.

[0110] In this embodiment, the stirring temperature for the stirring modification treatment was 57.5℃, the stirring speed was 800 r / min, and the stirring time was 1 h.

[0111] The preparation method of the additive in this embodiment is as follows:

[0112] Four parts of wollastonite, three parts of nanocellulose and 6.5 parts of modified betaine solution were mixed and stirred thoroughly, then filtered and dried to obtain the additive; wherein the modified betaine solution was obtained by immersing alkylamide betaine in β-cyclodextrin solution.

[0113] In this embodiment, the immersion power for sufficient immersion is 375W, and the immersion time is 1 hour. The β-cyclodextrin solution is prepared by mixing β-cyclodextrin, silane coupling agent KH550, and an 85% ethanol aqueous solution in a weight ratio of 3:1:5.

[0114] The preparation method of the shell powder-based regulator in this embodiment is as follows:

[0115] S11: Mix 3.5 parts shell powder, 2 parts carboxymethyl cellulose and 6.5 parts sodium lignosulfonate solution (8% by mass) thoroughly to obtain shell powder solution;

[0116] 4.5 parts of nano-titanium oxide and 2 parts of silicon carbide were mixed and added to 6.5 parts of phosphate buffer solution with a pH of 5.5. The mixture was stirred thoroughly to obtain the additive solution.

[0117] S102: The additive liquid and shell powder liquid are ultrasonically treated at a weight ratio of 2:5, the ultrasonic power is 375W, the ultrasonic treatment lasts for 1 hour, after ultrasonic treatment is completed, the mixture is filtered and dried to obtain a shell powder-based regulator.

[0118] This embodiment of a method for preparing a compound fertilizer for saline-alkali land includes the following steps:

[0119] Weigh the raw materials according to the specified weight proportions, stir and process the raw materials to obtain the compound fertilizer for saline-alkali land of the present invention.

[0120] In this embodiment, the stirring speed is 1100 r / min, and the stirring time is 1 h.

[0121] Comparative Example 1.

[0122] Unlike Example 3, no modified zeolite molecular sieve agent was added.

[0123] Comparative Example 2.

[0124] Unlike Example 3, no modifying liquid was added during the preparation of the modified zeolite molecular sieve agent.

[0125] Comparative Example 3.

[0126] Unlike Example 3, metakaolin and silane coupling agent were not added to the modified liquid.

[0127] Comparative Example 4.

[0128] Unlike Example 3, no illite or hydrotalcite was added to the illite liquid.

[0129] Comparative Example 5.

[0130] Unlike Example 3, no additives were added during the preparation of the modified zeolite molecular sieve agent.

[0131] Comparative Example 6.

[0132] The difference from Example 3 is that the preparation method of the additives is different, and wollastonite and nanocellulose were not added.

[0133] Comparative Example 7.

[0134] The modified betaine solution was prepared differently than in Example 3, without the addition of alkylamide betaine or β-cyclodextrin.

[0135] Comparative Example 8.

[0136] Unlike Example 3, no shell powder-based regulator was added.

[0137] Comparative Example 9.

[0138] Unlike Example 3, no additive liquid was added in the preparation of the regulator based on shell powder.

[0139] Examples 1-3 and Comparative Examples 1-9 were tested, with 120 kg of fertilizer applied per acre. The growth properties of the corn and the physical and chemical properties of the soil were tested, and the results are as follows.

[0140]

[0141] From Examples 1-3 and Comparative Examples 1-9, it can be seen that the product of the present invention can achieve coordinated improvement in the growth quality, yield, and soil physicochemical properties of corn. The performance of the product is significantly worse when neither modified zeolite molecular sieve agent nor shell powder-based regulator is added; the product's performance is most significantly improved when both are blended and synergistically formulated. In the preparation of the modified zeolite molecular sieve agent, no modifying liquid is added; in the modified liquid, no metakaolin or silane coupling agent is added; in the illite liquid, no illite or hydrotalcite is added; and in the preparation of the modified zeolite molecular sieve agent, no additives are added. Different preparation methods for additives, such as the absence of wollastonite or nanocellulose, and different preparation methods for modified betaine liquid, such as the absence of alkylamide betaine or β-cyclodextrin, all result in varying degrees of performance degradation. Only the modified zeolite molecular sieve agent obtained using the method of the present invention exhibits the most significant performance improvement. Similarly, in the preparation of the shell powder-based regulator, the performance of the product tends to deteriorate when no additive liquid is added; only the product raw material obtained using the method of the present invention exhibits the most significant performance improvement.

[0142] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0143] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A compound fertilizer for saline-alkali land, characterized in that, The compound fertilizer comprises the following raw materials in parts by weight: 35-40 parts cow manure, 15-20 parts sodium humate, 7-11 parts modified zeolite molecular sieve agent, 4-7 parts shell powder-based regulator, 3-5 parts trace elements, and 4-7 parts inorganic fertilizer. The modified zeolite molecular sieve agent is prepared by: S01: Stir the zeolite molecular sieve in a sufficient amount of sodium hydroxide solution, then wash with water, filter and dry. Preheat the dried zeolite molecular sieve at 55-60℃ for 1 hour to obtain the preheated zeolite molecular sieve. SO2: Preparation of modified liquid: S02a: Illite, hydrotalcite and sodium silicate solution were mixed and ball-milled at a weight ratio of (5-8):(3-5):

2. The ball milling speed was 1000-1500 r / min and the ball milling time was 2 h. After the ball milling was completed, illite solution was obtained. S02b: Mix 3-5 parts metakaolin, 1-2 parts silane coupling agent and 1-2 parts nano silica sol into 5-8 parts illite liquid and stir evenly to obtain the modified liquid; S03: The preheated zeolite molecular sieve and the modified liquid are stirred and modified at a weight ratio of 4:(7-9). After stirring, the modified zeolite molecular sieve liquid is obtained. The modified zeolite molecular sieve liquid and additives were mixed and ball-milled at a weight ratio of (7-11):

5. The ball milling speed was 1050-1100 r / min and the ball milling time was 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain the modified zeolite molecular sieve agent. The preparation method of the additive is as follows: Mix 3-5 parts of wollastonite, 2-4 parts of nanocellulose and 5-8 parts of modified betaine solution thoroughly, then filter and dry to obtain the additive; wherein the modified betaine solution is obtained by immersing alkylamide betaine in β-cyclodextrin solution until fully immersed. The preparation method of the shell powder-based regulator is as follows: S11: Mix 2-5 parts shell powder, 1-3 parts carboxymethyl cellulose and 5-8 parts of sodium lignosulfonate solution with a mass fraction of 8% to obtain shell powder solution; Add 3-6 parts of nano-titanium oxide and 1-3 parts of silicon carbide to 5-8 parts of phosphate buffer solution with a pH of 5.5, stir thoroughly, and obtain the additive solution; S102: The additive liquid and shell powder liquid are ultrasonically treated at a weight ratio of 2:5, the ultrasonic power is 350-400W, the ultrasonic treatment lasts for 1 hour, after ultrasonic treatment is completed, the mixture is filtered and dried to obtain a shell powder-based regulator. The β-cyclodextrin solution is prepared by mixing β-cyclodextrin, silane coupling agent KH550, and an 85% ethanol aqueous solution in a weight ratio of 3:1:

5.

2. The compound fertilizer for saline-alkali land according to claim 1, characterized in that, The trace elements are one or more combinations of fulvic acid chelated zinc, fulvic acid chelated iron, fulvic acid chelated manganese, and fulvic acid chelated boron; the inorganic fertilizer is a compound of nitrogen, phosphorus, and potassium in a weight ratio of 3:2:

2. The cow manure material is made by mixing cow manure, water, and straw ash in a weight ratio of 5:3:3, then adding 15-25% of Bacillus subtilis to the total cow manure, and fermenting at 40-45℃ for 12 days. After fermentation, the cow manure material is obtained.

3. A compound fertilizer for saline-alkali land according to claim 2, characterized in that, The sodium hydroxide solution has a mass fraction of 5-8%; the sodium silicate solution has a mass fraction of 5-8%; and the silane coupling agent is silane coupling agent KH560.

4. A compound fertilizer for saline-alkali land according to claim 3, characterized in that, The stirring temperature for the stirring modification treatment is 55-60℃, the stirring speed is 750-850 r / min, and the stirring time is 1 h.

5. A compound fertilizer for saline-alkali land according to claim 4, characterized in that, The required immersion power is 350-400W, and the immersion time is 1 hour.

6. A method for preparing a compound fertilizer for saline-alkali land as described in any one of claims 1-5, characterized in that, Includes the following steps: Weigh the raw materials according to the specified weight proportions, stir and process the raw materials to obtain the compound fertilizer for saline-alkali land.

7. The method for preparing a compound fertilizer for saline-alkali land according to claim 6, characterized in that, The stirring speed for the stirring process is 1050-1250 r / min, and the stirring time is 1 h.

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