Inhibitor-containing water-soluble fertilizer and preparation method thereof

Abstract

The invention discloses an inhibitor-containing water-soluble fertilizer and a preparation method thereof, and belongs to the technical field of fertilizer preparation, the fertilizer is composed of a water-soluble fertilizer and a nitrification inhibitor, the nitrification inhibitor is composed of an inhibitor and a stable synergist, the stable synergist is prepared from astaxanthin, sodium alginate, polyene phosphorylcholine, carboxymethyl chitosan and xylitol; the stable synergist is added on the basis of the existing pyrazole phosphate addition product, so that the stability of the pyrazole phosphate addition product in a fertilizer environment is improved, the nitrification inhibition efficiency of the pyrazole phosphate addition product is promoted, and a synergistic effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizer preparation, and in particular to a water-soluble fertilizer containing an inhibitor and a preparation method thereof. Background Art

[0002] Ammonium nitrogen can be absorbed by soil colloids and is not easily lost. However, under soil permeability conditions, ammonium nitrogen can be converted into nitrate nitrogen under the action of microorganisms. This process is called nitrification. However, nitrate nitrogen is easily lost in the soil. Reasonable use of nitrification inhibitors to control the rate of nitrification reaction can reduce nitrogen losses and improve the utilization rate of nitrogen fertilizers.

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

[0004] There are three main types of nitrification inhibitors currently in the mainstream industry: CP, DCD, and DMPP. The first is 2-chloro-6-(trichloromethyl)pyridine (also known as nitrogen pyridine), code-named CP, the second is dicyandiamide, code-named DCD, and the third is 3,4-dimethylpyrazole phosphate, code-named DMPP. In addition to these three mainstream nitrification inhibitors, there are also guanylthiourea (ASU), 2-methyl-4,6-bis(trichlorotoluene)-triazine (MDCT), 2-sulfathiazole (ST), etc. Among them, 3,4-dimethylpyrazole phosphate has the characteristics of high efficiency, non-toxicity, and stability, and has a high nitrification inhibition efficiency. A small amount can achieve a significant inhibition effect. It is called the most promising new generation of nitrogen fertilizer synergist in the 21st century and has broad application prospects.

[0005] Although the volatility of pyridine and pyrazole compounds can be significantly reduced by adding phosphates, after combining them with fertilizers, the phosphate addition products are easily decomposed due to the influence of anions and cations in the fertilizers. They have low storage stability and are difficult to effectively inhibit nitrification. Summary of the invention

[0006] In view of the above problems, the present invention provides a water-soluble fertilizer containing an inhibitor and a preparation method thereof.

[0007] The purpose of the present invention is achieved by the following technical solutions:

[0008] An inhibitor-containing water-soluble fertilizer consists of a water-soluble fertilizer and a nitrification inhibitor. The nitrification inhibitor consists of an inhibitor and a stabilizing synergist. The stabilizing synergist comprises 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 nitrification inhibitor is 100:(7-20).

[0012] In some preferred embodiments, the stabilizing enhancer includes, by weight, 2-5 parts of astaxanthin, 10-32 parts of sodium alginate, 12-33 parts of polyenylphosphocholine, 8-24 parts of carboxymethyl chitosan and 5-15 parts of xylitol.

[0013] In some preferred embodiments, the stabilizing enhancer includes, by weight, 2.5-3 parts of astaxanthin, 19-24 parts of sodium alginate, 20-25 parts of polyenylphosphocholine, 14-16 parts of carboxymethyl chitosan and 7-10 parts of 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; the potassium fertilizer is one or more of potassium nitrate, potassium sulfate, potassium chloride, potassium dihydrogen phosphate, and potassium-magnesium salts.

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

[0017] (1) weighing the astaxanthin, the sodium alginate, the polyenylphosphocholine, the carboxymethyl chitosan and the xylitol according to a ratio and setting aside;

[0018] (2) mixing the astaxanthin, the sodium alginate, the polyenylphosphocholine, the carboxymethyl chitosan and the xylitol, adding the inhibitor according to a certain ratio, and stirring and mixing to obtain the nitrification inhibitor;

[0019] (3) The nitrification inhibitor and the water-soluble fertilizer are stirred and mixed according to a certain ratio to obtain the water-soluble fertilizer containing the inhibitor.

[0020] The beneficial effects of the present invention are:

[0021] Aiming at the problem that the phosphate addition product of pyrazole compound in the prior art is easily decomposed under the influence of anions and cations in fertilizers, the present invention provides a water-soluble fertilizer containing an inhibitor, wherein a stabilizing synergist is added 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; specifically, astaxanthin has excellent antioxidant effect, can play a synergistic role for nitrification inhibition, but has poor hydrophilicity; sodium alginate contains free carboxyl and hydroxyl groups with D-mannuronic acid and L-cucurbituronic acid as monomers, which are easy to form a relatively stable complex with cations in the fertilizer, reducing the effect of fertilizer ions on nitrification inhibitors; polyenylphosphocholine has hydrophilicity. Phosphate anions, choline cations and hydrophobic fatty acid chains are a class of natural zwitterionic surfactants, which together with carboxymethyl chitosan form a composite protective layer between the fertilizer and the inhibitor to improve stability, but due to its low water solubility, its addition amount is not large; xylitol is a polyhydroxy molecule with a strong surface charge density, and can act as a hydrogen bond donor and acceptor at the same time, with good hydrophilicity, and its strong surface charge density is used to form a non-ionized, hydrogen-bonded stable protective layer between the fertilizer or the inhibitor to reduce the ionic environment of the fertilizer; the present invention obtains a component with stable synergistic effect on the phosphate addition product of the pyrazole compound through compounding, and can prepare a stable powdered water-soluble fertilizer product that meets the needs of different growth periods of crops. DETAILED DESCRIPTION

[0022] The present invention is further described in conjunction with the following examples.

[0023] Example 1

[0024] An inhibitor-containing water-soluble fertilizer, comprising a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor comprises an inhibitor and a stabilizing synergist, and the stabilizing synergist comprises 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 lecithin;

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

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

[0031] The method for preparing the water-soluble fertilizer containing the inhibitor comprises the following steps:

[0032] (1) weighing the astaxanthin, the sodium alginate, the soybean lecithin, the carboxymethyl chitosan and the xylitol according to a ratio and setting aside;

[0033] (2) mixing the astaxanthin, the sodium alginate, the soybean lecithin, the carboxymethyl chitosan and the xylitol, adding the inhibitor according to a certain ratio, and stirring and mixing to obtain the nitrification inhibitor;

[0034] (3) The nitrification inhibitor and the water-soluble fertilizer are stirred and mixed according to a certain ratio to obtain the water-soluble fertilizer containing the inhibitor.

[0035] Example 2

[0036] An inhibitor-containing water-soluble fertilizer, comprising a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor comprises an inhibitor and a stabilizing synergist, and the stabilizing synergist comprises 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 lecithin;

[0041] In terms of weight, the stabilizing synergist comprises 4 parts of astaxanthin, 30 parts of sodium alginate, 16.3 parts of soybean lecithin, 10 parts of carboxymethyl chitosan and 11 parts of xylitol;

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

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

[0044] Example 3

[0045] An inhibitor-containing water-soluble fertilizer, comprising a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor comprises an inhibitor and a protective agent, and the protective agent comprises 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 lecithin;

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

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

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

[0053] Example 4

[0054] An inhibitor-containing water-soluble fertilizer, which is composed of a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor is composed of an inhibitor and a protective agent, and the protective agent 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 that in Example 1;

[0058] The method for preparing the water-soluble fertilizer containing the inhibitor comprises the following steps:

[0059] (1) weighing the astaxanthin and the sodium alginate according to a ratio and setting aside;

[0060] (2) mixing the astaxanthin and the sodium alginate, adding the inhibitor according to a ratio, and stirring and mixing to obtain the nitrification inhibitor;

[0061] (3) The nitrification inhibitor and the water-soluble fertilizer are stirred and mixed according to a certain ratio to obtain the water-soluble fertilizer containing the inhibitor.

[0062] Example 5

[0063] An inhibitor-containing water-soluble fertilizer, which is composed of a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor is composed of an inhibitor and a protective agent, and the protective agent 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 that in Example 1;

[0067] The method for preparing the water-soluble fertilizer containing the inhibitor comprises the following steps:

[0068] (1) weighing the soybean lecithin and the carboxymethyl chitosan according to a ratio and setting aside;

[0069] (2) mixing the soybean lecithin and the carboxymethyl chitosan, adding the inhibitor according to a certain ratio, and stirring and mixing to obtain the nitrification inhibitor;

[0070] (3) The nitrification inhibitor and the water-soluble fertilizer are stirred and mixed according to a certain ratio to obtain the water-soluble fertilizer containing the inhibitor.

[0071] Example 6

[0072] An inhibitor-containing water-soluble fertilizer, which is composed of a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor is composed of an inhibitor and a protective agent, and the protective agent 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 that in Example 1;

[0076] The method for preparing the water-soluble fertilizer containing the inhibitor comprises the following steps:

[0077] (1) weighing the xylitol according to the ratio for later use;

[0078] (2) adding the xylitol to the inhibitor according to a ratio, stirring and mixing to obtain the nitrification inhibitor;

[0079] (3) The nitrification inhibitor and the water-soluble fertilizer are stirred and mixed according to a certain ratio to obtain the water-soluble fertilizer containing the inhibitor.

[0080] Example 7

[0081] An inhibitor-containing water-soluble fertilizer, comprising a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor comprises an inhibitor and a stabilizing synergist, and the stabilizing synergist comprises 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 lecithin;

[0086] In terms of weight, the stabilizing synergist comprises 2 parts of astaxanthin, 32 parts of sodium alginate, 12 parts of soybean lecithin, 8 parts of carboxymethyl chitosan and 5 parts of xylitol;

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

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

[0089] Example 8

[0090] An inhibitor-containing water-soluble fertilizer, comprising a water-soluble fertilizer and a nitrification inhibitor, wherein the nitrification inhibitor comprises an inhibitor and a stabilizing synergist, and the stabilizing synergist comprises 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 lecithin;

[0095] In terms of weight, the stabilizing synergist comprises 5 parts of astaxanthin, 10 parts of sodium alginate, 33 parts of soybean lecithin, 24 parts of carboxymethyl chitosan and 15 parts of xylitol;

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

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

[0098] Comparison Example

[0099] A water-soluble fertilizer containing an inhibitor, comprising 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 to the inhibitor is the same as that in Example 1.

[0100] Experimental example

[0101] Under indoor simulated fertilization culture conditions (constant temperature 25°C, constant humidity 60%), the water-soluble fertilizer containing inhibitors described in Examples 1-6 and the control example was tested in the soil to determine its nitrification inhibition effect. Ammonium sulfate was added at 0.5 g nitrogen / kg dry soil, and the soil ammonium nitrogen and nitrate nitrogen contents were measured on the 7th, 28th and 91st days, respectively. The test results are as follows:

[0102]

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution 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 nitrification inhibitor consists of an inhibitor and a stabilizing synergist, and the stabilizing synergist comprises astaxanthin, sodium alginate, polyene phosphocholine, carboxymethyl chitosan and xylitol.

2. The water-soluble fertilizer containing an inhibitor according to claim 1, characterized in that: The mass mixing ratio of the water-soluble fertilizer and the nitrification inhibitor is 100:(0.1-1).

3. The water-soluble fertilizer containing an inhibitor according to claim 1, characterized in that: The inhibitor is one or more of 2-chloro-6-trichloromethylpyridine phosphate, 4-chloro-3-methylpyrazole phosphate, and 3,4-dimethylpyrazole phosphate.

4. The water-soluble fertilizer containing an inhibitor according to claim 1, characterized in that: The mass ratio of the inhibitor to the stabilizing synergist in the nitrification inhibitor is 100:(7-20).

5. The water-soluble fertilizer containing an inhibitor according to claim 1, characterized in that: Calculated by weight, the stabilizing enhancer includes 2-5 parts of astaxanthin, 10-32 parts of sodium alginate, 12-33 parts of polyene phosphocholine, 8-24 parts of carboxymethyl chitosan and 5-15 parts of xylitol.

6. The water-soluble fertilizer containing an inhibitor according to claim 5, characterized in that: Calculated by weight, the stabilizing enhancer includes 2.5-3 parts of astaxanthin, 19-24 parts of sodium alginate, 20-25 parts of polyenylphosphocholine, 14-16 parts of carboxymethyl chitosan and 7-10 parts of xylitol.

7. The water-soluble fertilizer containing an inhibitor according to claim 1, characterized in that: The water-soluble fertilizer includes nitrogen fertilizer, and / or phosphorus fertilizer, and / or potassium fertilizer.

8. The water-soluble fertilizer containing an inhibitor according to claim 7, 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; the potassium fertilizer is one or more of potassium nitrate, potassium sulfate, potassium chloride, potassium dihydrogen phosphate, and potassium-magnesium salt.

9. A method for preparing a water-soluble fertilizer containing an inhibitor according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) weighing the astaxanthin, the sodium alginate, the polyenylphosphocholine, the carboxymethyl chitosan and the xylitol according to a ratio and setting aside; (2) mixing the astaxanthin, the sodium alginate, the polyenylphosphocholine, the carboxymethyl chitosan and the xylitol, adding the inhibitor according to a certain ratio, and stirring and mixing to obtain the nitrification inhibitor; (3) The nitrification inhibitor and the water-soluble fertilizer are stirred and mixed according to a certain ratio to obtain the water-soluble fertilizer containing the inhibitor.

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