A water-soluble fertilizer containing inhibitors and its preparation method

Abstract

This invention discloses a water-soluble fertilizer containing an inhibitor and its preparation method, belonging to the field of fertilizer preparation technology. The fertilizer is composed of a water-soluble fertilizer and a nitrification inhibitor. The nitrification inhibitor is composed of an inhibitor and a stabilizing synergist. The stabilizing synergist includes astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan, and xylitol. This invention adds a stabilizing synergist to the existing pyrazole phosphate addition product to improve its stability in the fertilizer environment, promote its nitrification inhibition efficiency, and thus play a synergistic role.

Description

Technical Field

[0001] This invention relates to the field of fertilizer preparation technology, specifically to a water-soluble fertilizer containing inhibitors and its preparation method. Background Technology

[0002] Ammonium nitrogen can be adsorbed by soil colloids and is not easily lost. However, under soil aeration conditions, ammonium nitrogen can be converted into nitrate nitrogen by microorganisms. This process is called nitrification. However, nitrate nitrogen is easily lost in the soil. The rational use of nitrification inhibitors to control the rate of nitrification reaction can reduce nitrogen loss and improve the utilization rate of nitrogen fertilizer.

[0003] Nitrification inhibitors are chemical substances that inhibit the biotransformation process of ammonium nitrogen into nitrate nitrogen (NCT). They selectively inhibit the activity of nitrifying bacteria in the soil, thereby slowing down the reaction rate of ammonium nitrogen to nitrate nitrogen in the soil. Nitrification inhibitors can reduce the loss of nitrogen fertilizer in the form of nitrate nitrogen and its impact on the ecological environment by reducing the generation and accumulation of nitrate nitrogen in the soil.

[0004] Currently, there are three main industrially available nitrification inhibitors: CP, DCD, and DMPP. The first is 2-chloro-6-(trichloromethyl)pyridine (also known as nitridine), code-named CP; the second is dicyandiamide, code-named DCD; and the third is 3,4-dimethylpyrazole phosphate, code-named DMPP. Besides these three main nitrification inhibitors, there are also amidinothiourea (ASU), 2-methyl-4,6-bis(trichlorotoluene)triazine (MDCT), and 2-sulfathiazole (ST), etc. Among them, 3,4-dimethylpyrazole phosphate, due to its high efficiency, non-toxicity, and stability, exhibits high nitrification inhibition efficiency; even a small amount can achieve a significant inhibitory effect. It is considered the most promising new generation of nitrogen fertilizer synergist of the 21st century and has broad application prospects.

[0005] Although the volatility of pyridine and pyrazole compounds can be significantly reduced by phosphate addition, the phosphate addition products are easily decomposed due to the influence of anions and cations in the fertilizer after being combined with them. Their storage stability is not high, and they are difficult to play an efficient role in inhibiting nitrification. Summary of the Invention

[0006] To address the above problems, this invention provides a water-soluble fertilizer containing inhibitors and a method for preparing the same.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A water-soluble fertilizer containing an inhibitor is composed of a water-soluble fertilizer and a nitrification inhibitor. The nitrification inhibitor is composed of an inhibitor and a stabilizing synergist, wherein the stabilizing synergist includes astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan, and xylitol.

[0009] In some preferred embodiments, the mass mixing ratio of the water-soluble fertilizer and the nitrification inhibitor is 100:(0.1-1).

[0010] In some preferred embodiments, the inhibitor is one or more of 2-chloro-6-trichloromethylpyridine phosphate, 4-chloro-3-methylpyrazole phosphate, and 3,4-dimethylpyrazole phosphate.

[0011] In some preferred embodiments, the mass ratio of the inhibitor to the stabilizing synergist in the nitration inhibitor is 100:(7-20).

[0012] In some preferred embodiments, the stabilizing synergist comprises, by weight, 2-5 parts astaxanthin, 10-32 parts sodium alginate, 12-33 parts polyene phosphocholine, 8-24 parts carboxymethyl chitosan, and 5-15 parts xylitol.

[0013] In some preferred embodiments, the stabilizing synergist comprises, by weight, 2.5-3 parts astaxanthin, 19-24 parts sodium alginate, 20-25 parts polyene phosphocholine, 14-16 parts carboxymethyl chitosan, and 7-10 parts xylitol.

[0014] In some preferred embodiments, the water-soluble fertilizer includes nitrogen fertilizer, and / or phosphorus fertilizer, and / or potassium fertilizer.

[0015] In some preferred embodiments, the nitrogen fertilizer is one or more of urea, ammonium chloride, and ammonium sulfate; the phosphate fertilizer is one or more of monoammonium phosphate, diammonium phosphate, potassium dihydrogen phosphate, ammonium polyphosphate, and potassium polyphosphate; and the potassium fertilizer is one or more of potassium nitrate, potassium sulfate, potassium chloride, potassium dihydrogen phosphate, and potassium magnesium salt.

[0016] Another aspect of the present invention is to provide a method for preparing the aforementioned inhibitor-containing water-soluble fertilizer, comprising the following steps:

[0017] (1) Weigh the astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan and xylitol according to the ratio, and set aside for later use;

[0018] (2) Mix the astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan and xylitol, add the inhibitor in proportion, and stir to obtain the nitration inhibitor;

[0019] (3) The nitrification inhibitor and the water-soluble fertilizer are mixed in proportion to obtain the water-soluble fertilizer containing the inhibitor.

[0020] The beneficial effects of this invention are as follows:

[0021] To address the problem that phosphate addition products of pyrazole compounds in existing technologies are easily decomposed by anions and cations in fertilizers, this invention provides a water-soluble fertilizer containing an inhibitor. This fertilizer adds a stabilizing synergist to the existing pyrazole phosphate addition products to improve their stability in the fertilizer environment, promote nitrification inhibition efficiency, and thus achieve a synergistic effect. Specifically, astaxanthin has excellent antioxidant properties and can enhance nitrification inhibition, but its hydrophilicity is poor. Sodium alginate contains free carboxyl and hydroxyl groups with D-mannuronic acid and L-cucurbituronic acid as monomers, which readily form relatively stable complexes with cations in fertilizers, reducing the effect of fertilizer ions on nitrification inhibitors. Polyene phosphate acylcholine has hydrophilic properties. Phosphate anions, choline cations, and hydrophobic fatty acid chains constitute a class of natural zwitterionic surfactants. Together with carboxymethyl chitosan, they form a composite protective layer between fertilizers and inhibitors, improving stability. However, due to their low water solubility, their addition amount is limited. Xylitol is a polyhydroxy molecule with a high surface charge density, capable of acting as both a hydrogen bond donor and acceptor. It exhibits good hydrophilicity and utilizes its high surface charge density to form a non-ionic, hydrogen-bonded stable protective layer with fertilizers or inhibitors, reducing the ionic environment of the fertilizer. This invention, through compounding, yields a component with stable synergistic effects on the phosphate addition product of pyrazole compounds, enabling the preparation of stable powdered water-soluble fertilizer products that meet the needs of crops at different growth stages. Detailed Implementation

[0022] The present invention will be further described in conjunction with the following embodiments.

[0023] Example 1

[0024] A water-soluble fertilizer containing an inhibitor is composed of a water-soluble fertilizer and a nitrification inhibitor. The nitrification inhibitor is composed of an inhibitor and a stabilizing synergist. The stabilizing synergist is composed of astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan, and xylitol.

[0025] The water-soluble fertilizer is ammonium sulfate;

[0026] The mass mixing ratio of the water-soluble fertilizer and the nitrification inhibitor is 100:0.35;

[0027] The inhibitor is 3,4-dimethylpyrazole phosphate;

[0028] The polyene phosphocholine is soybean phospholipid;

[0029] The stabilizing synergist, by weight, comprises 2.8 parts astaxanthin, 22 parts sodium alginate, 23 parts soybean lecithin, 15 parts carboxymethyl chitosan, and 8.5 parts xylitol.

[0030] The mass ratio of the inhibitor to the stabilizing synergist in the nitration inhibitor is 100:14;

[0031] The preparation method of the water-soluble fertilizer containing inhibitors includes the following steps:

[0032] (1) Weigh out the astaxanthin, sodium alginate, soybean lecithin, carboxymethyl chitosan and xylitol according to the ratio, and set aside;

[0033] (2) Mix the astaxanthin, sodium alginate, soybean lecithin, carboxymethyl chitosan and xylitol, add the inhibitor in proportion, and stir to obtain the nitration inhibitor;

[0034] (3) The nitrification inhibitor and the water-soluble fertilizer are mixed in proportion to obtain the water-soluble fertilizer containing the inhibitor.

[0035] Example 2

[0036] A water-soluble fertilizer containing an inhibitor is composed of a water-soluble fertilizer and a nitrification inhibitor. The nitrification inhibitor is composed of an inhibitor and a stabilizing synergist. The stabilizing synergist is composed of astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan, and xylitol.

[0037] The water-soluble fertilizer is ammonium sulfate;

[0038] The mass mixing ratio of the water-soluble fertilizer and the nitrification inhibitor is 100:0.35;

[0039] The inhibitor is 3,4-dimethylpyrazole phosphate;

[0040] The polyene phosphocholine is soybean phospholipid;

[0041] The stabilizing synergist, by weight, comprises 4 parts astaxanthin, 30 parts sodium alginate, 16.3 parts soybean lecithin, 10 parts carboxymethyl chitosan, and 11 parts xylitol.

[0042] The mass ratio of the inhibitor to the stabilizing synergist in the nitration inhibitor is 100:14;

[0043] The preparation method of the water-soluble fertilizer containing the inhibitor is the same as in Example 1.

[0044] Example 3

[0045] A water-soluble fertilizer containing an inhibitor is composed of a water-soluble fertilizer and a nitrification inhibitor. The nitrification inhibitor is composed of an inhibitor and a protectant. The protectant is composed of astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan, and xylitol.

[0046] The water-soluble fertilizer is ammonium sulfate;

[0047] The mass mixing ratio of the water-soluble fertilizer and the nitrification inhibitor is 100:0.35;

[0048] The inhibitor is 3,4-dimethylpyrazole phosphate;

[0049] The polyene phosphocholine is soybean phospholipid;

[0050] The protective agent comprises, by weight, 1 part astaxanthin, 35 parts sodium alginate, 12.3 parts soybean lecithin, 6 parts carboxymethyl chitosan, and 17 parts xylitol;

[0051] The mass ratio of the inhibitor to the protective agent in the nitration inhibitor is 100:14;

[0052] The preparation method of the water-soluble fertilizer containing the inhibitor is the same as in Example 1.

[0053] Example 4

[0054] A water-soluble fertilizer containing an inhibitor is composed of a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor is composed of an inhibitor and a protectant, and the protectant is astaxanthin and sodium alginate;

[0055] The water-soluble fertilizer is ammonium sulfate;

[0056] The inhibitor is 3,4-dimethylpyrazole phosphate;

[0057] The mass mixing ratio of the water-soluble fertilizer, the inhibitor, the astaxanthin, and the sodium alginate is the same as in Example 1;

[0058] The preparation method of the water-soluble fertilizer containing inhibitors includes the following steps:

[0059] (1) Weigh out the astaxanthin and sodium alginate according to the ratio and set aside;

[0060] (2) Mix the astaxanthin and the sodium alginate, add the inhibitor in proportion, and stir to obtain the nitration inhibitor;

[0061] (3) The nitrification inhibitor and the water-soluble fertilizer are mixed in proportion to obtain the water-soluble fertilizer containing the inhibitor.

[0062] Example 5

[0063] A water-soluble fertilizer containing an inhibitor is composed of a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor is composed of an inhibitor and a protectant, and the protectant is soybean lecithin and carboxymethyl chitosan;

[0064] The water-soluble fertilizer is ammonium sulfate;

[0065] The inhibitor is 3,4-dimethylpyrazole phosphate;

[0066] The mass mixing ratio of the water-soluble fertilizer, the inhibitor, the soybean lecithin, and the carboxymethyl chitosan is the same as in Example 1;

[0067] The preparation method of the water-soluble fertilizer containing inhibitors includes the following steps:

[0068] (1) Weigh the soybean lecithin and the carboxymethyl chitosan according to the ratio, and set aside;

[0069] (2) Mix the soybean lecithin and the carboxymethyl chitosan, add the inhibitor in proportion, and stir to obtain the nitration inhibitor;

[0070] (3) The nitrification inhibitor and the water-soluble fertilizer are mixed in proportion to obtain the water-soluble fertilizer containing the inhibitor.

[0071] Example 6

[0072] A water-soluble fertilizer containing an inhibitor is composed of a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor is composed of an inhibitor and a protectant, and the protectant is xylitol;

[0073] The water-soluble fertilizer is ammonium sulfate;

[0074] The inhibitor is 3,4-dimethylpyrazole phosphate;

[0075] The mass mixing ratio of the water-soluble fertilizer, the inhibitor, and the xylitol is the same as in Example 1;

[0076] The preparation method of the water-soluble fertilizer containing inhibitors includes the following steps:

[0077] (1) Weigh out the xylitol according to the specified ratio and set aside;

[0078] (2) The xylitol is added to the inhibitor in a certain proportion and stirred to obtain the nitration inhibitor;

[0079] (3) The nitrification inhibitor and the water-soluble fertilizer are mixed in proportion to obtain the water-soluble fertilizer containing the inhibitor.

[0080] Example 7

[0081] A water-soluble fertilizer containing an inhibitor is composed of a water-soluble fertilizer and a nitrification inhibitor. The nitrification inhibitor is composed of an inhibitor and a stabilizing synergist. The stabilizing synergist is composed of astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan, and xylitol.

[0082] The water-soluble fertilizer is ammonium sulfate;

[0083] The mass mixing ratio of the water-soluble fertilizer and the nitrification inhibitor is 100:0.35;

[0084] The inhibitor is 3,4-dimethylpyrazole phosphate;

[0085] The polyene phosphocholine is soybean phospholipid;

[0086] By weight, the stabilizing synergist includes 2 parts astaxanthin, 32 parts sodium alginate, 12 parts soybean lecithin, 8 parts carboxymethyl chitosan, and 5 parts xylitol.

[0087] The mass ratio of the inhibitor to the stabilizing synergist in the nitration inhibitor is 100:14;

[0088] The preparation method of the water-soluble fertilizer containing the inhibitor is the same as in Example 1.

[0089] Example 8

[0090] A water-soluble fertilizer containing an inhibitor is composed of a water-soluble fertilizer and a nitrification inhibitor. The nitrification inhibitor is composed of an inhibitor and a stabilizing synergist. The stabilizing synergist is composed of astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan, and xylitol.

[0091] The water-soluble fertilizer is ammonium sulfate;

[0092] The mass mixing ratio of the water-soluble fertilizer and the nitrification inhibitor is 100:0.35;

[0093] The inhibitor is 3,4-dimethylpyrazole phosphate;

[0094] The polyene phosphocholine is soybean phospholipid;

[0095] The stabilizing synergist, by weight, comprises 5 parts astaxanthin, 10 parts sodium alginate, 33 parts soybean lecithin, 24 parts carboxymethyl chitosan, and 15 parts xylitol.

[0096] The mass ratio of the inhibitor to the stabilizing synergist in the nitration inhibitor is 100:14;

[0097] The preparation method of the water-soluble fertilizer containing the inhibitor is the same as in Example 1.

[0098] Comparison Example

[0099] A water-soluble fertilizer containing an inhibitor is composed of a water-soluble fertilizer and an inhibitor, wherein the water-soluble fertilizer is ammonium sulfate and the inhibitor is 3,4-dimethylpyrazole phosphate; the mass ratio of the water-soluble fertilizer and the inhibitor is the same as in Example 1.

[0100] Experimental Example

[0101] Under simulated indoor cultivation conditions (constant temperature 25℃, constant humidity 60%), the water-soluble fertilizers containing inhibitors described in Examples 1-6 and the control example were tested in soil to determine their nitrification inhibition effect. Ammonium sulfate was added at a rate of 0.5 g nitrogen / kg dry soil, and the soil ammonium nitrogen and nitrate nitrogen contents were measured on days 7, 28, and 91. The results are as follows:

[0102]

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A water-soluble fertilizer containing an inhibitor, comprising a water-soluble fertilizer and a nitrification inhibitor, characterized in that, The nitration inhibitor consists of an inhibitor and a stabilizing synergist, wherein the stabilizing synergist includes astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan, and xylitol. The mass mixing ratio of the water-soluble fertilizer and the nitrification inhibitor is 100:(0.1-1). The inhibitor is one or more of 2-chloro-6-trichloromethylpyridine phosphate, 4-chloro-3-methylpyrazole phosphate, and 3,4-dimethylpyrazole phosphate; The mass ratio of the inhibitor to the stabilizing synergist in the nitration inhibitor is 100:(7-20). The stabilizing synergist, by weight, comprises 2-5 parts astaxanthin, 10-32 parts sodium alginate, 12-33 parts polyene phosphocholine, 8-24 parts carboxymethyl chitosan, and 5-15 parts xylitol.

2. The water-soluble fertilizer containing inhibitor according to claim 1, characterized in that, The stabilizing synergist, by weight, comprises 2.5-3 parts astaxanthin, 19-24 parts sodium alginate, 20-25 parts polyene phosphocholine, 14-16 parts carboxymethyl chitosan, and 7-10 parts xylitol.

3. The water-soluble fertilizer containing inhibitor according to claim 1, characterized in that, The water-soluble fertilizers include nitrogen fertilizer, phosphorus fertilizer, and potassium fertilizer.

4. A water-soluble fertilizer containing an inhibitor according to claim 3, characterized in that, The nitrogen fertilizer is one or more of urea, ammonium chloride, and ammonium sulfate; the phosphate fertilizer is one or more of monoammonium phosphate, diammonium phosphate, potassium dihydrogen phosphate, ammonium polyphosphate, and potassium polyphosphate; and the potassium fertilizer is one or more of potassium nitrate, potassium sulfate, potassium chloride, potassium dihydrogen phosphate, and potassium magnesium salt.

5. A method for preparing a water-soluble fertilizer containing an inhibitor according to any one of claims 1-4, characterized in that, Includes the following steps: (1) Weigh out the astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan and xylitol according to the ratio, and set aside; (2) Mix the astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan and xylitol, add the inhibitor in proportion, and stir to obtain the nitration inhibitor; (3) The nitrification inhibitor and the water-soluble fertilizer are mixed in proportion to obtain the water-soluble fertilizer containing the inhibitor.

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