High nitrogen stable liquid macronutrient water-soluble fertilizer and its application

Abstract

The invention provides a high-nitrogen stable liquid macro-element water-soluble fertilizer and application thereof, wherein the high-nitrogen stable liquid macro-element water-soluble fertilizer comprises, by weight, 600-900 parts of urea ammonium nitrate solution and 100-400 parts of ammonium phosphite, which is 1000 parts in total; wherein the urea ammonium nitrate solution has a nitrogen content of 420 g / L, the ammonium phosphite has a nitrogen content of 150 g / L and a phosphorus content of 400 g / L, and the macro-element water-soluble fertilizer has a total nitrogen content of 300 g / L-400 g / L and a total phosphorus content of 40 g / L-160 g / L.

Description

Technical Field

[0001] The invention belongs to the technical field of fertilizers, and in particular relates to a high-nitrogen stable liquid macro-element water-soluble fertilizer, and more specifically to a high-nitrogen stable synergistic liquid macro-element water-soluble fertilizer and application thereof. Background Art

[0002] A large number of water-soluble fertilizers are a type of multi-component fertilizer that can be completely soluble in water. They are divided into solid and liquid types. It can dissolve quickly in water and is more easily absorbed by crops. Moreover, its absorption and utilization rate is relatively high. In addition, it can be used in facility agriculture such as sprinkler and drip irrigation to achieve water-fertilizer integration and save water, fertilizer and labor. Since powdered water-soluble fertilizers of large numbers of elements can be produced by blending different nitrogen, phosphorus and potassium raw materials, high-nitrogen powdered water-soluble fertilizers of large numbers of elements can be produced. At present, the agricultural industry standard for water-soluble fertilizers of large numbers of elements is NY / T1107-2020. The specific nutrient index requirements are shown in Table 1. Liquid water-soluble fertilizer products contain at least two of the three nutrients of nitrogen, phosphorus and potassium, and the total content of nitrogen, phosphorus and potassium is ≥400g / L, and the single nutrient is ≥40g / L.

[0003] Table 1 Requirements for water-soluble fertilizers of macroelements

[0004]

[0005] At present, the nitrogen content of products produced by various manufacturers of macronutrient liquid water-soluble fertilizers is less than 300g / L. When the nitrogen content is increased to above 300g / L, crystallization and precipitation problems will occur at low temperatures (0°C and below), making it difficult to achieve production and application in winter. Liquid nitrogen fertilizer urea ammonium nitrate solution (UAN for short, nitrogen content 350-420g / L) has a high nitrogen content and is prone to crystallization and precipitation under low temperature conditions, resulting in a significant reduction in commercial value. Therefore, commercial products are generally low-nitrogen, high-phosphorus, and high-potassium products (nitrogen content less than 300g / L). The above stability issues reduce the application scope of liquid macronutrient water-soluble fertilizers, and there is an urgent need to develop new products. Summary of the invention

[0006] In view of the above problems, the present invention provides a high-nitrogen stable liquid macro-element water-soluble fertilizer and its application, in order to at least partially solve the above technical problems. In this regard, the technical solution provided by the present invention is as follows.

[0007] As a first aspect of the present invention, a high-nitrogen stable liquid macro-element water-soluble fertilizer is provided. The macro-element water-soluble fertilizer comprises, by mass, 600-900 parts of urea ammonium nitrate solution and 100-400 parts of ammonium phosphite, totaling 1000 parts; wherein the nitrogen content of the urea ammonium nitrate solution is 420 g / L, the nitrogen content of the ammonium phosphite is 150 g / L, and the phosphorus content is 400 g / L; the total nitrogen content of the macro-element water-soluble fertilizer is 300 g / L-400 g / L, and the total phosphorus content is 40 g / L-160 g / L.

[0008] Furthermore, the macro-element water-soluble fertilizer includes, by mass, 800-900 parts of urea ammonium nitrate solution, and 100-200 parts of ammonium phosphite, totaling 1000 parts; the total nitrogen content of the macro-element water-soluble fertilizer is 350g / L-400g / L, and the total phosphorus content is 40g / L-80g / L.

[0009] According to an embodiment of the present invention, the macronutrient water-soluble fertilizer further comprises 1 to 20 parts of a stabilizing agent and / or 1 to 10 parts of a synergistic agent, by weight, wherein the stabilizing agent is a water reducing agent and / or an antifreeze agent;

[0010] Among them, the water reducer includes at least one of sodium lignin sulfonate, polypropyl cellulose, and polycarboxylic acid monomers, the antifreeze includes at least one of ethylene glycol and ammonium carboxylate; the synergistic additive includes at least one of chitosan, polyglutamic acid, seaweed vitality factor, complex amino acids, fish protein peptides, aminobutyric acid, brown algae oligosaccharides, mineral humic acid, spring element, yellow peptide, seaweed polysaccharides, plant element, and Yishibang.

[0011] Furthermore, the macro-element water-soluble fertilizer further comprises, by weight: 8 to 12 parts of stabilizing aids and / or 4 to 8 parts of synergistic aids.

[0012] According to the embodiment of the present invention, the macro-element water-soluble fertilizer has no crystal precipitation in an ambient temperature of -10°C to 54°C.

[0013] According to an embodiment of the present invention, when the stabilizers are water reducer and antifreeze agent, the mass ratio of the water reducer to the antifreeze agent is 4-6:6-4; or when there are two synergists, the mass ratio of any two synergists is 2-4:4-2.

[0014] According to an embodiment of the present invention, further, the macro-element water-soluble fertilizer has no crystal precipitation in an ambient temperature of -20°C to 54°C.

[0015] As a second aspect of the present invention, provided is the use of the water-soluble fertilizer in crop planting.

[0016] According to an embodiment of the present invention, the crops include any one of food crops and cash crops.

[0017] According to an embodiment of the present invention, the water-soluble fertilizer is used to promote crop growth and increase crop yield.

[0018] Based on the above technical scheme, the high-nitrogen stable liquid macro-element water-soluble fertilizer provided by the present invention and its application include at least one of the following beneficial effects:

[0019] (1) In the embodiment of the present invention, the nitrogen content in the single urea ammonium nitrate solution (UAN) is relatively high (350-420g / L). When the nitrogen content is higher than 350g / L and above, because its solubility in the aqueous solution approaches saturation, as the ambient temperature decreases, the solubility in the aqueous solution decreases, resulting in crystallization and affecting the use effect. In this regard, the present invention introduces ammonium phosphite and mixes it with UAN in proportion to obtain a large amount of element water-soluble fertilizer. On the one hand, the nitrogen content of the water-soluble fertilizer can be maintained to 300g / L-400g / L, wherein the nitrogen content in the water-soluble fertilizer mainly comes from UAN, and the phosphorus element required in the water-soluble fertilizer is further supplemented. The use cost of the water-soluble fertilizer can also be reduced by mixing; on the other hand, UAN has poor stability in a low temperature environment. Compared with other phosphorus-containing compounds, the water-soluble fertilizer obtained after ammonium phosphite is mixed with UAN has high stability in the environment, and can stably exist without crystallization at an ambient temperature of -10°C and above (such as -10°C-54°C).

[0020] (2) In the embodiments of the present invention, adding a water reducer or an antifreeze agent to pure UAN cannot effectively improve the stability of UAN at -10°C to 0°C, resulting in the problem of crystallization of some UAN using a water reducer or an antifreeze agent. In order to further improve the stability of the water-soluble fertilizer obtained by blending UAN and ammonium phosphite in the environment, by introducing a water reducer and / or an antifreeze agent to blend with them, the blended water-soluble fertilizer can be stably present in an ambient temperature of -20°C and above (such as -20°C to 54°C) without crystallization, thereby meeting the storage and use of the water-soluble fertilizer in winter.

[0021] (3) In the embodiments of the present invention, fertilizer synergists are introduced to increase the nutrient supply to crops by improving the absorption of nitrogen, phosphorus and potassium fertilizers by crops and activating the difficult-to-use nitrogen, phosphorus, potassium and other elements in the soil, thereby improving the utilization rate of fertilizers and reducing the amount of fertilizer applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a graph comparing the stability of different stabilizing agents in Examples 1-7 of the present invention after being mixed with 1000 parts of UAN at -20°C;

[0023] Figure 2 This is a graph showing the stability comparison results of different stabilizing aids in Example 8 of the present invention after compounding with the water-soluble fertilizer in Example A3 at -20°C;

[0024] Figure 3 This is a graph showing the stability comparison results of different stabilizing aids in Example 9 of the present invention after compounding with the water-soluble fertilizer in Example A4 at -20°C;

[0025] Figure 4 This is a graph showing the stability comparison results of different stabilizing aids in Example 10 of the present invention after compounding with the water-soluble fertilizer in Example A5 at -20°C;

[0026] Figure 5 This is a graph showing the stability comparison results of different stabilizing aids in Example 11 of the present invention after compounding with the water-soluble fertilizer in Example A6 at -20°C;

[0027] Figure 6 This is a graph showing the stability comparison results of different synergistic adjuvants compounded in Example 12 of the present invention, the water-soluble fertilizer in Example A4, and the stabilizing adjuvants in Examples B5 and B7 at -20°C;

[0028] Figure 7 This is a comparison chart of some water-soluble fertilizers in the application examples of the present invention used in the early stage of topdressing of corn;

[0029] Figure 8 This is a comparison chart of topdressing of some water-soluble fertilizers in the application examples of the present invention at the corn heading stage. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0031] At present, the solubility of high-nitrogen macro-element liquid water-soluble fertilizer in aqueous solution is close to saturation. As the ambient temperature decreases, its solubility in aqueous solution decreases and crystals precipitate, which affects the use effect of the water-soluble fertilizer.

[0032] Specifically, the present invention provides a high-nitrogen stable liquid macro-element water-soluble fertilizer, which comprises, by weight, 600-900 parts of urea ammonium nitrate solution and 100-400 parts of ammonium phosphite, totaling 1000 parts; wherein the nitrogen content in the urea ammonium nitrate solution is 420 g / L, the nitrogen content in the ammonium phosphite is 150 g / L, and the phosphorus content is 400 g / L; the total nitrogen content in the macro-element water-soluble fertilizer is 300 g / L-400 g / L, and the total phosphorus content is 40 g / L-160 g / L.

[0033] In the embodiment of the present invention, by introducing ammonium phosphite and UAN and mixing them in proportion to obtain a large amount of element water-soluble fertilizer, on the one hand, the phosphorus element required in the water-soluble fertilizer can be further supplemented, while maintaining the total nitrogen content of the water-soluble fertilizer to 300g / L~400g / L, wherein the nitrogen content in the water-soluble fertilizer mainly comes from UAN, and the use cost of the water-soluble fertilizer can be reduced by mixing while supplementing the phosphorus element required in the water-soluble fertilizer; on the other hand, because UAN is unstable in a low temperature environment (-20℃~0℃). Compared with other phosphorus-containing compounds, ammonium phosphite has a higher stability in the environment. After mixing with UAN, the obtained water-soluble fertilizer can be stably present at an ambient temperature of -10℃ and above (such as -10℃~54℃) without crystallization.

[0034] According to an embodiment of the present invention, the nitrogen element in the water-soluble fertilizer mainly comes from 420g / L urea ammonium nitrate solution (UAN), wherein the urea ammonium nitrate solution (UAN) includes amide nitrogen, nitrate nitrogen, and ammonia nitrogen. The ammonium phosphite in the present invention is synthesized by reacting 100-200 parts of liquid ammonia with 300-500 parts of phosphorous acid in a 140°C reactor.

[0035] According to an embodiment of the present invention, in parts by mass, preferably 800 to 900 parts of UAN and 100 to 200 parts of ammonium phosphite are compounded to obtain a high-nitrogen stable liquid macronutrient water-soluble fertilizer, and the total nitrogen content in the obtained macronutrient water-soluble fertilizer is 350g / L to 400g / L, and the total phosphorus content is 40g / L to 80g / L. Through the mutual coordination of each component of UAN and ammonium phosphite, the nitrogen content in the macronutrient liquid water-soluble fertilizer and the stability at low temperature (-10°C and above) are significantly improved, and when each component is compounded in a preferred amount, the obtained formula effect is better. The present invention does not particularly limit the specific sources of the above components, and conventional commercial sources in this field are all available.

[0036] According to an embodiment of the present invention, in order to further improve the stability of the liquid water-soluble fertilizer obtained after compounding UAN and ammonium phosphite in the environment and / or enhance the fertilizer efficiency of the water-soluble fertilizer, and increase crop yield, the present invention is achieved by introducing a stabilizing agent and / or a synergistic agent, wherein the stabilizing agent includes a water reducer and / or an antifreeze agent. A water reducer is a concrete admixture that reduces the amount of mixing water while maintaining the slump of the concrete substantially unchanged. After being added to the concrete mixture, it has a dispersing effect on the cement particles, can improve its workability, reduce the unit water consumption, and improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement. Antifreeze is an admixture that can harden concrete at negative temperatures and achieve the expected performance and sufficient antifreeze strength under specified curing conditions. It is a substance that can prevent the water in the material from freezing at low temperatures. However, currently water reducers and antifreeze agents are rarely used in agricultural fertilizers. In this regard, the present invention aims at the advantages of water reducers and / or antifreeze agents, introduces them into water-soluble fertilizers of a large number of elements, and utilizes water reducers and / or antifreeze agents to increase the solubility and uniformity of liquid water-soluble fertilizers of a large number of elements, reduce the unit amount of water, and greatly reduce crystallization, so that the high-nitrogen liquid water-soluble fertilizers of a large number of elements after mixing with stabilizing agents are stably present in an ambient temperature above -20°C (-20°C to 54°C) without crystallization. Synergists refer to a class of active substances for the purpose of increasing nutrient effectiveness, which are commonly used in plant cultivation in this field, and have a fertilizer synergistic effect on promoting indicators such as plant height, stem thickness, above-ground fresh weight, and underground fresh weight. By introducing synergists, the absorption of nitrogen, phosphorus, and potassium by crops is improved, and the nitrogen, phosphorus, potassium and other elements that are difficult to use in the soil are activated to increase the nutrient supply to crops, improve the utilization rate of fertilizers, reduce the amount of fertilizer applied, and play a certain role in regulating plant physiological functions. There are many types of fertilizer synergists, which can be divided into nitrification inhibitors, urease inhibitors, nutrient activators, water retaining agents, etc. In this regard, the present invention can significantly improve fertilizer efficiency and promote crop yield by adding synergists on the basis of introducing water reducers and / or antifreeze agents.

[0037] Specifically, the macronutrient water-soluble fertilizer of the present invention further comprises 1 to 20 parts of stabilizing aids and / or 1 to 10 parts of synergistic aids by weight, and the stabilizing aids are water reducing agents and / or antifreeze agents.

[0038] In other words, the high nitrogen stable liquid macronutrient water-soluble fertilizer includes 600-900 parts of urea ammonium nitrate solution with a nitrogen content of 420g / L, and 100-400 parts of ammonium phosphite with a nitrogen content of 150g / L and a phosphorus content of 400g / L, totaling 1000 parts; and 1-20 parts of stabilizing aids, and the total nitrogen content of the obtained liquid water-soluble fertilizer is 300g / L-400g / L. By compounding UAN, ammonium phosphite, and stabilizing aids under these components, the obtained water-soluble fertilizer is stable at ambient temperatures of -10°C and above (such as -10°C-0°C and 0°C-54°C) without crystallization. Or: In terms of mass fractions, the high nitrogen stable liquid macronutrient water-soluble fertilizer includes 600-900 parts of urea ammonium nitrate solution with a nitrogen content of 420g / L, and 100-400 parts of ammonium phosphite with a nitrogen content of 150g / L and a phosphorus content of 400g / L, totaling 1000 parts; and 1-10 parts of synergist, and the total nitrogen content in the obtained liquid water-soluble fertilizer is 300g / L-400g / L. By compounding UAN, ammonium phosphite, and synergist under these components, the obtained water-soluble fertilizer can also be stably present in an ambient temperature of -10°C and above (such as -10°C-0°C and 0°C-54°C), without crystallization, and applied to crops, it can significantly promote crop growth and increase crop yield. Alternatively, the high nitrogen stable liquid macronutrient water-soluble fertilizer includes 600-900 parts of urea ammonium nitrate solution with a nitrogen content of 420g / L, and 100-400 parts of ammonium phosphite with a nitrogen content of 150g / L and a phosphorus content of 400g / L, totaling 1000 parts; and 1-20 parts of stabilizing aids and 1-10 parts of synergistic aids, and the total nitrogen content in the obtained liquid water-soluble fertilizer is 300g / L-400g / L. By compounding UAN, ammonium phosphite, stabilizing aids, and synergistic aids under these components, the obtained water-soluble fertilizer is stable in an ambient temperature of -10°C and above (such as -10°C to 0°C and 0°C to 54°C), without crystal precipitation, and applied to crops, it can significantly promote crop growth and increase crop yield.

[0039] Furthermore, the macro-element water-soluble fertilizer includes, by weight: 8 to 12 parts of stabilizing aids and / or 4 to 8 parts of synergistic aids.

[0040] According to an embodiment of the present invention, the water reducer includes at least one of sodium lignin sulfonate, polypropyl cellulose, and polycarboxylic acid monomers, and the antifreeze agent includes at least one of ethylene glycol and ammonium carboxylate. In the case where the stabilizer is a water reducer and an antifreeze agent, the mass ratio of the water reducer to the antifreeze agent is 4-6:6-4. For example: in terms of mass fractions, the stabilizing aid includes 1-10 parts of polycarboxylic acid monomers (water reducers) and 1-10 parts of ammonium carboxylates (antifreeze agents). Preferably, the stabilizing aid includes 4-6 parts of polycarboxylic acid monomers and 4-6 parts of ammonium carboxylates, and the mass ratio of polycarboxylic acid monomers to ammonium carboxylates is 4-6:6-4. In an embodiment of the present invention, the stabilizing aid obtained by compounding the water reducer and the antifreeze agent has a significant effect on improving the nitrogen content and low-temperature stability of the liquid macronutrient water-soluble fertilizer by utilizing the mutual coordination of each component, especially in a low temperature environment temperature above -20°C (such as -20°C to 54°C) without crystallization; and when each component is compounded in the preferred dosage, the obtained formula effect is the best. The present invention does not particularly limit the specific sources of the above components, and any conventional commercial sources in the art can be used.

[0041] According to an embodiment of the present invention, the synergistic aid includes at least one of chitosan, polyglutamic acid, seaweed vitality, composite amino acids, fish protein peptides, aminobutyric acid, brown algae oligosaccharides, mineral humic acid, spring essence, yellow peptide, seaweed polysaccharides, plant elements, and Yishibang. Furthermore, the synergistic aid is preferably seaweed polysaccharide and fish protein peptide. In the case of two synergistic aids, the mass ratio of any two synergistic aids is 2-4: 4-2. For example: seaweed polysaccharides and fish protein peptides are compounded to obtain a synergistic aid. By utilizing the mutual coordination of each component, it has a significant effect on improving the fertilizer efficiency of liquid macro-element water-soluble fertilizers, and when each component is compounded in a preferred dosage, the obtained formula effect is the best. The present invention does not particularly limit the specific sources of the above-mentioned components, and conventional commercial sources in this field are all acceptable. It should be noted that Chunzhisu fertilizer enhancer was purchased from Henan Zhongwei Chunyu Plant Nutrition Co., Ltd.; Huangpeptideamine and phytochemical fertilizer enhancers were purchased from Henan Ennuo Agricultural Technology Co., Ltd.; Yishibang amino acid water-soluble fertilizer was purchased from Syngenta Group.

[0042] According to an embodiment of the present invention, there is also provided an application of a large amount of water-soluble fertilizer of elements as in the above embodiment in crop planting.

[0043] In the embodiments of the present invention, the use of the macro-element water-soluble fertilizer of the present invention can significantly improve the stability of the liquid water-soluble fertilizer and promote crop growth and increase yield, which has great application significance in increasing crop yield.

[0044] According to an embodiment of the present invention, the crops include any one of food crops and cash crops.

[0045] The technical solutions provided by the present invention are described in detail below in conjunction with the examples, but they should not be understood as limiting the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the examples are conventional methods; the materials and reagents used can be obtained from commercial sources.

[0046] Formula Screening Example

[0047] First, UAN, ammonium phosphite, UAN and ammonium phosphite, and UAN with other phosphorus-containing compounds (such as ammonium polyphosphate, copper phosphite, and ammonium phosphate) were compounded, and the nitrogen content, the content of various forms of phosphorus (such as P2O5, PO3, polyphosphoric acid, etc.) in the obtained liquid water-soluble fertilizer, and the stability of whether the water-soluble fertilizer crystallizes under different temperature conditions were tested. The specific test results are shown in Table 2.

[0048] Table 2

[0049]

[0050] It can be seen from Examples A1-A8 that UAN is unstable at ambient temperatures of 0°C, -10°C, and -20°C; ammonium phosphite can exist stably at ambient temperatures of 0°C and -10°C, but cannot exist stably at -20°C. Furthermore, after UAN and phosphorous acid are mixed and compounded in the mass ratios of 9:1, 8:2, 7:3, 6:4, 5:5, and 4:6, the total nitrogen content in the obtained macro-element water-soluble fertilizer is >250 g / L, among which, when UAN and phosphorous acid are compounded in the mass ratios of 9:1, 8:2, 7:3, and 6:4, the total nitrogen content in the obtained liquid macro-element water-soluble fertilizer is >300 g / L, among which, when UAN and phosphorous acid are compounded in the mass ratios of 9:1 and 8:2, the total nitrogen content in the obtained liquid water-soluble fertilizer is >350 g / L, and when UAN and phosphorous acid are mixed and compounded in the mass ratios of 5:5 and 4:6, the total nitrogen content in the obtained liquid macro-element water-soluble fertilizer is <300 g / L. In addition, after UAN and ammonium phosphite are mixed in any proportion, the obtained liquid macronutrient water-soluble fertilizer is stable at 0°C and -10°C, that is, no crystallization is precipitated, indicating that the addition of ammonium phosphite can improve the stability of UAN under conditions above -10°C (such as -10°C to 54°C). Furthermore, the present invention also uses different phosphorus-containing compounds for comparison, such as ammonium polyphosphate, copper phosphite, ammonium phosphate, etc. After UAN is mixed and compounded with ammonium polyphosphate, copper phosphite, and ammonium phosphate in a mass fraction ratio of 8:2, the nitrogen content in the obtained liquid macronutrient water-soluble fertilizer exceeds 300g / L, but the obtained liquid macronutrient water-soluble fertilizer cannot be stably present at 0°C, -10°C, and -20°C ambient temperatures. Thus, through the above-mentioned Examples A1-A11, the formulas of four high-nitrogen liquid macronutrient water-soluble fertilizers in Examples A3-A6 are preferably obtained. In addition, by compounding UAN and ammonium phosphite, the use cost of the obtained liquid macronutrient water-soluble fertilizer is significantly reduced.

[0051] Furthermore, the liquid water-soluble fertilizer obtained by mixing UAN with different stabilizing agents was tested to determine the stability of different liquid water-soluble fertilizers under low temperature conditions. The specific test results are shown in Table 3.

[0052] Table 3

[0053]

[0054] Note: The stabilizing aid in Examples B2-B5 is a water reducer, and the stabilizing aid in Examples B6-B7 is an antifreeze agent.

[0055] As shown in Example B1 in Table 3, adding 4-10 parts of deionized water to UAN cannot improve the low temperature performance of the liquid macronutrient water-soluble fertilizer. As shown in Example B2, adding 4 parts of water reducer (sodium lignin sulfonate) to UAN cannot improve the stability of UAN at 0°C; while for the stabilizing aids in Examples B3-B7, adding 4 parts of the stabilizing aids in Examples B3-B7 to 1000 parts of UAN can improve the stability of UAN at 0°C. Further, as shown in Examples B2-B7, when the water reducer in Example B5 or the antifreeze in Example B7 is 6-10 parts, the stability of the liquid macronutrient water-soluble fertilizer at -10°C is significantly improved, while for other Examples B2-B4 and Example B6, the stability of the liquid macronutrient water-soluble fertilizer at 0°C can be improved, thus through the above Example B, the stabilizing aids in Examples B5 and B7 are determined. In addition, based on the formula in Table 1, a water reducing agent and / or a water reducing agent is introduced for compounding, and the obtained high-nitrogen liquid macro-element water-soluble fertilizer can exist stably at an ambient temperature of -10°C and above without crystallization.

[0056] Example

[0057] Furthermore, it can be seen from the above Examples A and B that UAN has poor stability under low temperature conditions, and the stabilizing agent can effectively improve the low temperature stability of UAN. Therefore, whether the two stabilizing agents in Examples B5 and B7 are compounded with UAN has a synergistic and complementary effect, the specific test results are shown in Table 4.

[0058] Table 4

[0059]

[0060] Note: B5 represents the stabilizing auxiliary polycarboxylic acid monomer in Example B5, and B7 represents the stabilizing auxiliary ammonium carboxylate in Example B7.

[0061] Through the above Examples 1-7, different proportions of stabilizing aids were compounded and mixed with 1000 parts of UAN. It was found that after B5 and B7 were compounded with UAN in any ratio of 0:10, 2:8, 4:6, 5:5, 6:4, 8:2, and 10:0, the stability of UAN at -10°C was improved without crystallization; and only after B5 and B7 were mixed in a mass ratio of 4:6, 5:5, and 6:4 (Examples 3-5), the stability of UAN at -20°C was improved without crystallization; and when B5 and B7 were mixed in a ratio of 0:10, 2:8, 8:2, and 10:0, the obtained water-soluble fertilizer could not stably exist at -20°C, and crystallization was precipitated, as shown in the following example. Figure 1 shown.

[0062] Figure 1 This is a graph showing the stability comparison results of different stabilizing agents in Examples 1-7 of the present invention mixed with 1000 parts of UAN at -20°C. Figure 1 The formulas in Examples 1-7 correspond from left to right.

[0063] Therefore, by comparing the embodiments in Table 4, the preferred embodiment 3-5, that is, B5 and B7 are mixed in a mass ratio of 4-6:6-4.

[0064] Furthermore, Examples 3-5 preferred from Examples 1-7 in Table 4 are compounded with Examples A3-A6 preferred from Example A to determine whether the obtained high-nitrogen liquid water-soluble fertilizer can complement and improve the stability of the compounded water-soluble fertilizer at low temperatures. The specific test results are shown in Table 5.

[0065] Table 5

[0066]

[0067] Note: High nitrogen liquid water-soluble fertilizer A is a water-soluble fertilizer obtained by compounding UAN and ammonium phosphite according to the mass parts in Table 2. A3 represents Example A3 in Table 2, i.e., 900 parts of UAN and 100 parts of ammonium phosphite, a total of 1000 parts, for compounding; similarly, A4 represents Example A4 in Table 2; A5 represents Example A5 in Table 2; A6 represents Example A6 in Table 2.

[0068] As shown in Table 5, B5 and B7 were mixed with 1000 parts of A3-A6 (UAN, ammonium phosphite) in different proportions and the stability was compared at -20°C. After testing, it was found that A3 and B5 and / or B7 were mixed with any proportion of stabilizers, which could not improve the stability of the compounded macronutrient water-soluble fertilizer at -20°C, and crystals were precipitated. Figure 2 shown.

[0069] Figure 2 The stability comparison result of different stabilizing aids in Example 8 of the present invention and the water-soluble fertilizer in Example A3 at -20°C is shown in FIG. Figure 2 From left to right in the table, B5∶B7=0∶10~10∶0.

[0070] like Figure 2 As shown, after the stabilizing aid formed by mixing B5 and B7 in Example 8 according to different ratios was mixed with the water-soluble fertilizer in Example A3, the obtained aqueous solution of the macro-element water-soluble fertilizer all had crystallization precipitation under -20°C and could not exist stably.

[0071] Figure 3This is a graph showing the stability comparison results of different stabilizing aids in Example 9 of the present invention after compounding with the water-soluble fertilizer in Example A4 at -20°C. Figure 4 The stability comparison result of different stabilizing aids in Example 10 of the present invention and the water-soluble fertilizer in Example A5 at -20°C is shown in FIG. Figure 5 This is a graph showing the stability comparison results of different stabilizing aids in Example 11 of the present invention after compounding with the water-soluble fertilizer in Example A6 at -20°C, wherein: Figure 3-Figure 5 From left to right in the table, B5∶B7=0∶10~10∶0.

[0072] like Figure 3-5 As shown, when the mixing ratio of B5 and B7 is 0:10 and 10:0, the water-soluble fertilizer of a large number of elements in Examples 8-11 cannot be stably present at -20°C, that is, crystallization occurs. However, when B5 and B7 are mixed and compounded with 1000 parts of UAN and ammonium phosphite in A4-A6 in a ratio of 2:8, 4:6, 5:5, 6:4, and 8:2, the stability of the water-soluble fertilizer of a large number of elements obtained at -20°C can be improved. By comparison with the above-mentioned Examples 3-5, Examples 9-11 can improve the stability of the water-soluble fertilizer of a large number of elements obtained after compounding at -20°C after B5 and B7 are mixed and compounded in a ratio of 2:8 and 8:2. It can be seen that the low-temperature stability of B5 and B7 after being mixed and compounded with high-nitrogen liquid water-soluble fertilizer A4-A6 at a ratio of 2:8-8:2 is greatly improved, but considering that the stability of UAN with B5 and B7 when mixed at a ratio of 2:8 to 8:2 is poor, it is shown that UAN can improve the stability of large-element water-soluble fertilizer at -10°C to 0°C after compounding with ammonium phosphite. On this basis, the stabilizing agents B5 and B7 are introduced into UAN and ammonium phosphite and mixed in a certain proportion, and the obtained large-element water-soluble fertilizer can be stably present at -20°C. Therefore, taking into account comprehensively, through the above-mentioned Examples 1-11, the formula of the large-element water-soluble fertilizer in Examples 9-11 is preferably selected, that is, the stabilizing agents B5 and B7 are mixed and compounded with the high-nitrogen liquid water-soluble fertilizer in Examples A4-A6 at a ratio of 4-6:6-4.

[0073] The effects of different synergistic adjuvants on the growth of cereal crops (corn variety: Xinda 203) were investigated as follows:

[0074] Test crops: corn potted plants (artificial climate greenhouse, day: night = 12:12);

[0075] Treatment method: Under the same base fertilizer dosage (N-P2O5-K2O is 15-15-15); weigh the synergist and dilute it to prepare the synergist solution in equal volume, add quantitatively to each treatment by pipette, and repeat 5 pots for each treatment. Sow 6 seeds in each pot, and after germination, select 3 seedlings with consistent growth in each pot and keep them in an artificial greenhouse. The growth-promoting effects of different treatments on corn seedling height, stem thickness, and fresh weight were measured 25 days after treatment. The growth-promoting effects of different synergists on corn are shown in Table 6.

[0076] Table 6

[0077] deal with Synergist Dosage g / mu Plant heightcm Stem diameter mm Above ground fresh weight g Underground fresh weight g T1 Shimizu 80 14.78 2.54 1.15 1.86 T2 Chitosan Oligosaccharide 20 16.70 2.96 1.30 1.58 T3 Polyglutamic acid 40 17.60 2.87 1.23 1.51 T4 Seaweed Vitality 80 17.74 3.25 1.36 1.93 T5 Amino Acid Complex 400 16.34 3.00 1.33 1.99 T6 Fish protein peptide 60 18.23 3.31 1.48 2.78 T7 Brown algae oligosaccharide 12 16.70 2.88 1.10 2.22 T8 Mineral source fulvic acid 240 17.31 2.98 1.40 2.10 T9 GABA 40 16.20 3.14 1.32 2.13 T10 Spring Element 20 16.97 3.16 1.32 2.02 T11 Xanthopeptide 20 16.82 3.15 1.41 2.10 T12 Seaweed polysaccharide 60 18.86 3.40 1.61 2.26 T13 Phytochemicals 40 17.37 3.10 1.40 2.28 T14 Yishibang 100 17.09 2.97 1.39 1.99

[0078] As shown in Table 6, seaweed polysaccharides and fish protein peptides have a significant effect on promoting the plant height, stem thickness, aboveground fresh weight and underground fresh weight of cereal crops, and have obvious advantages over other types of synergistic adjuvants. Seaweed polysaccharides can improve plant cell activity, enhance resistance to adversities such as frost damage, drought and flooding, and reduce the occurrence of diseases. The dosage of seaweed polysaccharides is generally 50-100g / mu, preferably 60g / mu. The effect of seaweed polysaccharides on the aboveground fresh weight of cereal crops is more obvious (in the potted experiment of corn seed seedlings, with clear water as the control, 60g / mu of seaweed polysaccharides were added, and the aboveground fresh weight after 25 days of treatment was increased to 1.61g compared with 1.15g of the control group). The dosage of fish protein peptide is generally 50-100g / mu, preferably 60g / mu. Fish protein peptide has a better effect on increasing the underground fresh weight of cereal crops (in a potted experiment of corn seed seedlings, with clear water as the control, 60g / mu of fish protein peptide was added, and the underground fresh weight after 25 days of treatment was increased from 1.86g in the control group to 2.78g). Other synergistic adjuvants, such as: chitosan oligosaccharides, seaweed vitality, spring element, etc., also have obvious synergistic effects on the plant height, stem thickness, aboveground fresh weight and underground fresh weight of cereal crops (better than other conventional synergistic adjuvants), but in further studies on increasing the yield of cereal crops, chitosan oligosaccharides, seaweed vitality, spring element and other synergistic adjuvants performed significantly weaker than seaweed polysaccharides and fish protein peptides. Therefore, seaweed polysaccharides and fish protein peptides are preferred as synergistic adjuvants.

[0079] Furthermore, the high-nitrogen liquid macro-element water-soluble fertilizer with higher combination stability in the above embodiment is combined with a preferred synergistic adjuvant, that is, 800 parts of UAN, 200 parts of ammonium phosphite, 5 parts of polycarboxylic acid monomer, 5 parts of ammonium carboxylate and different proportions of fish protein peptides and seaweed polysaccharides are compounded and the stability of the compounded water-soluble fertilizer is measured. The specific test results are shown in Table 7.

[0080] Table 7

[0081]

[0082] As shown in Example 12 in Table 7, the synergistic aids fish protein peptide and seaweed polysaccharide are mixed in any proportion with UAN and ammonium phosphite in Example A4, and the stabilizing aids in Examples B5 and B7, and the obtained water-soluble fertilizers are stable at -20°C. Figure 6 shown.

[0083] Application Examples

[0084] TCK and T1-T5 in Example 12 were applied as topdressing at the corn tassel stage to verify their growth-promoting and yield-increasing effects.

[0085] Test crops: corn, variety: YF3240. Base fertilizer 40kg / mu, effective nutrient content of base fertilizer is N-P2O5-K2O (15-15-15).

[0086] Test method: In each treatment, 10 kg / mu of topdressing fertilizer was diluted 100 times with water during the corn tassel stage.

[0087] CK treatment group: no topdressing.

[0088] TCK treatment group: 10 kg of high nitrogen stable liquid fertilizer.

[0089] T1 treatment group: 10kg / mu of high-nitrogen stable liquid fertilizer, and 20g / mu of fish protein peptide and 100g / mu of seaweed polysaccharide in the T1 formula.

[0090] T2 treatment group: 10kg / mu of high-nitrogen stable liquid fertilizer, and 40g / mu of fish protein peptides and 80g / mu of seaweed polysaccharides in the T2 formula.

[0091] T3 treatment group: 10kg / mu of high-nitrogen stable liquid fertilizer, and 60g / mu of fish protein peptides and 60g / mu of seaweed polysaccharides in the T3 formula.

[0092] T4 treatment group: 10kg / mu of high-nitrogen stable liquid fertilizer, and 80g / mu of fish protein peptides and 40g / mu of seaweed polysaccharides in the T4 formula.

[0093] T5 treatment group: 10kg / mu of high-nitrogen stable liquid fertilizer, and 100g / mu of fish protein peptide and 20g / mu of seaweed polysaccharide in the T5 formula.

[0094] The growth-promoting effects of different treatments on plant height and stem diameter were measured at the booting stage, and the yield-increasing effects were measured at maturity. The specific test results are shown in Table 8.

[0095] Table 8

[0096]

[0097] It can be seen from the test results in Table 8 that the plant height, stem fresh weight, and yield of corn treated with TCK, T1-T5 liquid water-soluble fertilizers are significantly improved compared with those treated with CK (no topdressing) in the early, middle, and late stages. The plant height, stem fresh weight, and yield of corn treated with TCK liquid fertilizer are significantly improved compared with those treated with CK in the early, middle, and late stages, indicating that the high nitrogen liquid fertilizer (UAN, ammonium phosphite, and stabilizing agent) of the present invention has a significant effect of promoting crop growth and increasing yield, and the water-soluble fertilizer formed by the synergistic aids fish protein peptide and seaweed polysaccharide will further increase the effect of promoting growth and increasing yield, such as the T1-T5 treatment group; and when the fish protein peptide and seaweed polysaccharide are 40g-80g / mu: 80-40g / mu (i.e., 2-4 parts: 4-2 parts), the effect of promoting growth and increasing yield is better, with better economic benefits, among which T3 has the best effect of promoting growth and increasing yield. Figure 7 This is a comparison chart of some water-soluble fertilizers in the application examples of the present invention used in the early stage of corn topdressing. Figure 8 This is a comparison chart of topdressing of some water-soluble fertilizers in the application examples of the present invention at the corn heading stage, wherein: Figure 7 and Figure 8 From left to right are the CK, TCK, T2, T3, and T4 treatment groups.

[0098] like Figure 7 As shown in the figure, the effect of applying synergistic adjuvant (T2-T4 treatment group) on improving crop plant height and stem diameter was significantly higher than that of CK and TCK treatment groups. Figure 8 As shown, compared with CK and TCK, the corn ears in the T2-T4 treatment groups were significantly larger than the former, and the final yield was increased.

[0099] In summary, the present invention mixes UAN and ammonium phosphite in proportion, and the total nitrogen content in the obtained high-nitrogen synergistic liquid macronutrient water-soluble fertilizer is 300g / L-400g / L, and can stably exist in a low temperature environment above -10°C (such as -10°C-54°C) without crystallization. Further, the total nitrogen content of the water-soluble fertilizer is greater than 350g / L and can stably exist at a certain ratio. The liquid macronutrient water-soluble fertilizer of the present invention solves the problem of low nitrogen content and poor low-temperature stability of water-soluble fertilizer. On this basis, a stabilizing agent is introduced into the water-soluble fertilizer and the dosage ratio in the stabilizing agent is controlled, and the obtained macronutrient water-soluble fertilizer can stably exist in an ambient temperature above -20°C-54°C. Furthermore, the high-nitrogen synergistic stable liquid macronutrient water-soluble fertilizer formed by the compounding of UAN, ammonium phosphite, stabilizing agent, and synergistic agent can significantly improve the stability of the liquid fertilizer through the synergistic effect between the various components, and can significantly promote the growth of crops and increase yields, and has great application significance in promoting crop yield increase.

[0100] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-nitrogen stable liquid macronutrient water-soluble fertilizer, which comprises, by weight: 600-800 parts of urea ammonium nitrate solution, and 200-400 parts of ammonium phosphite, a total of 1000 parts; as well as The macronutrient water-soluble fertilizer further includes a stabilizing agent, wherein the stabilizing agent is a water reducer and an antifreeze agent, and the weight ratio of the water reducer to the antifreeze agent is 4-6:6-4; the water reducer is a polycarboxylic acid monomer, and the antifreeze agent is ammonium carboxylate; The nitrogen content of the urea ammonium nitrate solution is 420 g / L, the nitrogen content of the ammonium phosphite is 150 g / L, and the phosphorus content is 400 g / L. The total nitrogen content of the macronutrient water-soluble fertilizer is 300 g / L to 400 g / L, and the total phosphorus content is 40 g / L to 160 g / L. The macro-element water-soluble fertilizer has no crystal precipitation in an ambient temperature of -20°C to 54°C.

2. The macronutrient water-soluble fertilizer according to claim 1, wherein the macronutrient water-soluble fertilizer further comprises 1 to 10 parts of a synergist, by weight; The synergistic auxiliary agent includes at least one of chitosan, polyglutamic acid, seaweed vitality factor, complex amino acids, fish protein peptides, aminobutyric acid, brown algae oligosaccharides, mineral humic acid, spring element, yellow peptide amine, seaweed polysaccharides, plant element, and Yishibang.

3. The macronutrient water-soluble fertilizer according to claim 2, wherein: Calculated by weight, the macro-element water-soluble fertilizer also includes: 4 to 8 parts of synergistic aids.

4. The macronutrient water-soluble fertilizer according to claim 3, wherein: When there are two synergists, the weight ratio of any two synergists is 2-4:4-2.

5. Use of the macro-element water-soluble fertilizer according to any one of claims 1 to 4 in crop planting.

6. The use according to claim 5, wherein: The crops include any one of food crops and cash crops.

7. The use according to claim 5, wherein: The macronutrient water-soluble fertilizer is used to promote the growth of the crops and increase the yield of the crops.

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