Stable DMPP as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of fertilizers, and particularly discloses stable DMPP as well as a preparation method and application thereof. The stable DMPP comprises the following raw material components: DMPP and a stabilizer, the mass ratio of the DMPP to the stabilizer is 1: (6-8), and the stabilizer comprises urea phosphate, rosin and polyvinyl alcohol. The stable DMPP has good stability, can effectively inhibit nitration of nitrogen fertilizer, reduce loss of the nitrogen fertilizer and improve the utilization rate of the nitrogen fertilizer when being used together with the fertilizer, and alleviates environmental problems caused by use of the nitrogen fertilizer while improving the economic benefits of agricultural production.

Description

Technical Field

[0001] The present invention relates to the technical field of fertilizers, and in particular to a stable DMPP and a preparation method and application thereof. Background Art

[0002] The nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) inactivates the enzyme by chelating the copper ions of ammonia monooxygenase on the cell membranes of ammonia-oxidizing microorganisms in the soil, inhibiting the conversion of ammonium nitrogen to nitrate nitrogen. This results in the majority of nitrogen fertilizer in the soil being present as ammonium nitrogen, reducing nitrate leaching from the soil. In agricultural production, nitrification inhibitors can inhibit soil nitrification, reduce nitrous oxide emissions, minimize nitrogen losses, and improve nitrogen fertilizer utilization. They also effectively control the absorption of excess nitrate nitrogen by crops and prevent the accumulation of excessive nitrates.

[0003] However, there are two problems with the currently used DMPP nitrification inhibitor: First, DMPP is formed by the reaction of 3,4-dimethylpyrazole and phosphoric acid, and 3,4-dimethylpyrazole is extremely volatile, so DMPP is also relatively easy to volatilize, especially when applied to alkaline soil. The neutralization of phosphate and alkali makes it more volatile, which greatly limits the application scope and application effect of DMPP; second, due to the volatility of DMPP, it cannot be added internally during the fertilizer production process. Therefore, DMPP is mainly applied to the fertilizer surface through external spraying technology. However, the external spraying method requires solvents, which can easily cause the fertilizer surface to be wet, reduce the fertilizer strength, and the recovery of the solvent will also increase the difficulty of the process.

[0004] Therefore, solving the volatility of DMPP and preparing it into a stable DMPP will greatly expand the application scope and application effect of DMPP. Summary of the Invention

[0005] In view of the above, it is necessary to provide a stabilized DMPP, its preparation method, and its application. The stabilized DMPP of the present invention has good stability and, when used in combination with fertilizers, can effectively inhibit the nitrification of nitrogen fertilizers, reduce nitrogen fertilizer losses, and increase nitrogen fertilizer utilization. This improves the economic benefits of agricultural production while alleviating environmental issues caused by the use of nitrogen fertilizers.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A stable DMPP comprises the following raw material components: DMPP and a stabilizer, wherein the mass ratio of the DMPP to the stabilizer is 1:6-8, and the stabilizer comprises urea phosphate, rosin and polyvinyl alcohol.

[0008] Furthermore, the mass ratio of the urea phosphate, the rosin and the polyvinyl alcohol is 10:1-2:0.5-1.

[0009] Furthermore, the mass ratio of the urea phosphate, the rosin and the polyvinyl alcohol is 10:1.6:0.7.

[0010] The present invention also provides a method for preparing the stable DMPP, comprising the following steps:

[0011] (1) melting the urea phosphate, the rosin, and the polyvinyl alcohol to obtain a melt;

[0012] (2) Adding the DMPP to the melt and mixing uniformly, spraying and granulating, cooling and solidifying, thereby obtaining the stable DMPP.

[0013] The present invention also provides an application of the stable DMPP in fertilizers.

[0014] The present invention also provides a fertilizer, which comprises a nitrogen fertilizer and the stable DMPP, and the amount of the DMPP used is 0.5-1% of the pure N amount of the nitrogen fertilizer.

[0015] Furthermore, the nitrogen fertilizer is urea.

[0016] The present invention has the following beneficial effects:

[0017] 1. The present invention uses urea phosphate, rosin and polyvinyl alcohol as a stabilizer for DMPP, which can form a dense protective layer on the surface of DMPP, effectively slow down the volatilization loss of DMPP, greatly improve the application effect of DMPP, and effectively inhibit the conversion of ammonium nitrogen in nitrogen fertilizer to nitrate nitrogen.

[0018] 2. The preparation method of the stabilized DMPP of the present invention is simple and is conducive to industrial production.

[0019] 3. The DMPP of the present invention is combined with nitrogen fertilizer to promote the absorption and utilization of nutrients by eggplant, thereby improving the quality of eggplant. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to specific embodiments.

[0021] Example 1

[0022] A stable DMPP is prepared by the following method:

[0023] (1) Raw material preparation: urea phosphate, rosin and polyvinyl alcohol are mixed uniformly in a mass ratio of 10:1:0.5 to obtain the stabilizer; 1 part of DMPP and 6 parts of the stabilizer are weighed by mass and set aside;

[0024] (2) Melting: Melt the weighed stabilizer and maintain the temperature at 95°C to obtain a molten stabilizer;

[0025] (3) Mixing: The weighed DMPP is added to the melt stabilizer and mixed evenly, sprayed into granules, and cooled and solidified to obtain the stable DMPP.

[0026] Example 2

[0027] A stable DMPP is prepared by the following method:

[0028] (1) Raw material preparation: urea phosphate, rosin and polyvinyl alcohol are mixed uniformly in a mass ratio of 10:1.6:0.7 to obtain the stabilizer; 1 part of DMPP and 7 parts of the stabilizer are weighed by mass and set aside;

[0029] (2) Melting: Melt the weighed stabilizer and maintain the temperature at 95°C to obtain a molten stabilizer;

[0030] (3) Mixing: The weighed DMPP is added to the melt stabilizer and mixed evenly, sprayed into granules, and cooled and solidified to obtain the stable DMPP.

[0031] Example 3

[0032] A stable DMPP is prepared by the following method:

[0033] (1) Raw material preparation: urea phosphate, rosin and polyvinyl alcohol are mixed uniformly in a mass ratio of 10:2:1 to obtain the stabilizer; 1 part of DMPP and 8 parts of the stabilizer are weighed by mass and set aside;

[0034] (2) Melting: Melt the weighed stabilizer and maintain the temperature at 95°C to obtain a molten stabilizer;

[0035] (3) Mixing: The weighed DMPP is added to the melt stabilizer and mixed evenly, sprayed into granules, and cooled and solidified to obtain the stable DMPP.

[0036] Example 4

[0037] A fertilizer comprises urea (N content 46%) and the stable DMPP of Example 1, wherein the amount of the DMPP is 0.5% of the pure N content of the urea.

[0038] Example 5

[0039] A fertilizer comprises urea (N content 46%) and the stable DMPP of Example 2, wherein the amount of the DMPP is 0.8% of the pure N content of the urea.

[0040] Example 6

[0041] A fertilizer comprises urea (N content 46%) and the stable DMPP of Example 3, wherein the amount of the DMPP is 1.0% of the pure N content of the urea.

[0042] Comparative Example 1

[0043] A stable DMPP is prepared by the following method:

[0044] (1) Raw material preparation: urea phosphate, rosin and polyvinyl alcohol are mixed uniformly in a mass ratio of 10:1:0.5 to obtain the stabilizer; 1 part of DMPP and 5 parts of the stabilizer are weighed by mass and set aside;

[0045] (2) Melting: Melt the weighed stabilizer and maintain the temperature at 95°C to obtain a molten stabilizer;

[0046] (3) Mixing: The weighed DMPP is added to the melt stabilizer and mixed evenly, sprayed into granules, and cooled and solidified to obtain the stable DMPP.

[0047] Comparative Example 2

[0048] A stable DMPP is prepared by the following method:

[0049] (1) Raw material preparation: urea phosphate, rosin and polyvinyl alcohol are mixed uniformly in a mass ratio of 10:1:0.5 to obtain the stabilizer; 1 part of DMPP and 9 parts of the stabilizer are weighed by mass and set aside;

[0050] (2) Melting: Melt the weighed stabilizer and maintain the temperature at 95°C to obtain a molten stabilizer;

[0051] (3) Mixing: The weighed DMPP is added to the melt stabilizer and mixed evenly, sprayed into granules, and cooled and solidified to obtain the stable DMPP.

[0052] Comparative Example 3

[0053] A stable DMPP is prepared by the following method:

[0054] (1) Raw material preparation: urea phosphate and rosin are mixed uniformly in a mass ratio of 10:1.6 to obtain the stabilizer; 1 part of DMPP and 7 parts of the stabilizer are weighed by mass and set aside;

[0055] (2) Melting: Melt the weighed stabilizer and maintain the temperature at 95°C to obtain a molten stabilizer;

[0056] (3) Mixing: The weighed DMPP is added to the melt stabilizer and mixed evenly, sprayed into granules, and cooled and solidified to obtain the stable DMPP.

[0057] Comparative Example 4

[0058] A stable DMPP is prepared by the following method:

[0059] (1) Raw material preparation: urea phosphate, paraffin and polyethylene glycol were mixed uniformly in a mass ratio of 10:1.6:0.7 to obtain the stabilizer; 1 part of DMPP and 7 parts of the stabilizer were weighed by mass and set aside;

[0060] (2) Melting: Melt the weighed stabilizer and maintain the temperature at 95°C to obtain a molten stabilizer;

[0061] (3) Mixing: The weighed DMPP is added to the melt stabilizer and mixed evenly, sprayed into granules, and cooled and solidified to obtain the stable DMPP.

[0062] Comparative Example 5

[0063] A fertilizer comprises urea (N content 46%) and the stable DMPP of Comparative Example 3, wherein the amount of the DMPP is 0.5% of the pure N content of the urea.

[0064] Comparative Example 6

[0065] A fertilizer comprises urea (N content 46%) and the stable DMPP of Comparative Example 4, wherein the amount of the DMPP is 0.8% of the pure N content of the urea.

[0066] Effect verification

[0067] 1. DMPP retention rate determination

[0068] The fertilizers of Examples 1-3 and Comparative Examples 1-4 were stored at room temperature for 180 days. The amount of DMPP in the fertilizers was measured before and after storage, and the DMPP retention rate over 180 days was calculated. The measurement results are shown in Table 1.

[0069] Table 1 DMPP 180-day retention rate in each group (%)

[0070] Group 180d retention rate (%) Example 1 78.35 Example 2 79.21 Example 3 78.66 Comparative Example 1 70.54 Comparative Example 2 71.33 Comparative Example 3 65.31 Comparative Example 4 64.28

[0071] As shown in Table 1, the DMPP retention rate in the fertilizers of Examples 1-3 after 180 days of storage is significantly higher than that of Comparative Examples 1-4.

[0072] The ratios of stabilizer to DMPP differed between Comparative Examples 1 and 2, while no polyvinyl alcohol was added to the stabilizer in Comparative Example 3. Paraffin wax was used instead of rosin in Comparative Example 4. As shown above, the modified diatomaceous earth produced using the stabilizer of the present invention within a specific range can increase the retention rate of DMPP in fertilizers. In other words, the modified diatomaceous earth of the present invention can enhance the storage stability of DMPP.

[0073] 2. Effect of DMPP-containing fertilizers on eggplant

[0074] 1) Test method

[0075] Eggplant seedlings were purchased from the market and selected for their five-leaf saplings. Each eggplant seedling was planted in a white pot containing 1 kg of brown soil, with one plant per pot. The experiment was divided into seven treatments, with six pots per treatment. The six treatments were as follows:

[0076] CK: no fertilizer;

[0077] C1: urea alone (N content 46%);

[0078] C2: application of the fertilizer of Example 4;

[0079] C3: application of the fertilizer of Example 5;

[0080] C4: application of the fertilizer of Example 6;

[0081] C5: application of the fertilizer of Comparative Example 5;

[0082] C6: The fertilizer of Comparative Example 6 was applied.

[0083] The experiment was managed according to routine procedures. The first topdressing was done one and a half months after planting, and the second topdressing was done two weeks later at a rate of 150 mg per application.

[0084] 2) Survey indicators

[0085] One month after the second topdressing, eggplants were harvested and the following indicators were measured:

[0086] (1) Soluble sugar concentration (mg / g): determined by the anthrone method;

[0087] (2) Eggplant yield per plant (kg): After harvesting the eggplants, calculate the average yield per plant.

[0088] The measurement results are shown in Table 2 below.

[0089] Table 2 Effects of different fertilizers on eggplant yield and soluble sugar concentration

[0090] Group Yield per plant (kg) Soluble sugar concentration (mg / g) CK 1.41 4.06 C1 1.84 4.18 C2 3.18 4.31 C3 3.32 4.38 C4 3.09 4.33 C5 2.23 4.21 C6 2.51 4.16

[0091] As shown in Table 2, the eggplant yield and soluble sugar concentration of C2-C4 were higher than those of CK, C1 and C5-C6 groups, indicating that the fertilizer containing the stabilized DMPP of the present invention can improve the yield and quality of eggplant.

Claims

1. A stable DMPP, characterized in that The invention comprises the following raw material components: DMPP and a stabilizer, wherein the mass ratio of the DMPP to the stabilizer is 1:6-8, and the stabilizer comprises urea phosphate, rosin and polyvinyl alcohol.

2. A stable DMPP according to claim 1, characterized in that: The mass ratio of the urea phosphate, the rosin and the polyvinyl alcohol is 10:1-2:0.5-1.

3. A stable DMPP according to claim 2, characterized in that: The mass ratio of the urea phosphate, the rosin and the polyvinyl alcohol is 10:1.6:0.

7.

4. The method for preparing a stable DMPP according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) melting the urea phosphate, the rosin, and the polyvinyl alcohol to obtain a melt; (2) Adding the DMPP to the melt and mixing uniformly, spraying and granulating, cooling and solidifying, thereby obtaining the stable DMPP.

5. Use of the stabilized DMPP according to any one of claims 1 to 3 in fertilizers.

6. A fertilizer, characterized in that The fertilizer includes nitrogen fertilizer and the stabilized DMPP, and the amount of the DMPP is 0.5-1% of the pure N amount of the nitrogen fertilizer.

7. A fertilizer according to claim 6, characterized in that: The nitrogen fertilizer is urea.