CN116621658A - Nitrogen-phosphorus synergistic agent composition and application thereof - Google Patents

Nitrogen-phosphorus synergistic agent composition and application thereof Download PDF

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CN116621658A
CN116621658A CN202310885311.XA CN202310885311A CN116621658A CN 116621658 A CN116621658 A CN 116621658A CN 202310885311 A CN202310885311 A CN 202310885311A CN 116621658 A CN116621658 A CN 116621658A
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dmpp
nitrogen
phosphorus
fertilizer
acid
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CN116621658B (en
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尤龙
常冬
王敏欣
冀定磊
曹晓艳
董肖杰
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Sinochem Agriculture Holdings
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Sinochem Agriculture Holdings
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01CPLANTING; SOWING; FERTILISING
    • A01C21/00Methods of fertilising, sowing or planting
    • CCHEMISTRY; METALLURGY
    • C05FERTILISERS; MANUFACTURE THEREOF
    • C05GMIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G3/00Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • CCHEMISTRY; METALLURGY
    • C05FERTILISERS; MANUFACTURE THEREOF
    • C05GMIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G3/00Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C05G3/90Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/20Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
    • Y02P60/21Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures

Abstract

The invention relates to the technical field of agricultural preparations, in particular to a nitrogen-phosphorus synergistic agent composition and application thereof. The invention discovers that polymaleic acid, maleic acid-acrylic acid copolymer or the mixture thereof can obviously improve the stability of DMPP in the fertilizer, effectively reduce the content loss of DMPP in the storage process of the fertilizer and improve the effectiveness of the DMPP in the fertilizer. According to the nitrogen-phosphorus synergistic agent composition, polymaleic acid, maleic acid-acrylic acid copolymer or a mixture thereof is matched with DMPP, so that the stability of the DMPP in a fertilizer is obviously improved, the content stability and the effectiveness can be kept in a long-time storage process, the nitrogen fertilizer utilization rate can be effectively improved, the possibility that phosphorus is fixed by soil is reduced, the phosphorus fertilizer utilization rate is improved, and the nitrogen-phosphorus synergistic agent composition has a good application prospect in the fertilizer field.

Description

Nitrogen-phosphorus synergistic agent composition and application thereof
Technical Field
The invention relates to the technical field of agricultural preparations, in particular to a nitrogen-phosphorus synergistic agent composition and application thereof.
Background
Nitrogenous fertilizer and phosphate fertilizer are one of the most important fertilizers in the agricultural field. Nitrogen and phosphorus are one of the essential nutrient elements for crop growth, and many important organic compounds in plants contain nitrogen and phosphorus. Nitrogen and phosphorus are involved in photosynthesis, respiration, energy storage and transfer, cell division, cell enlargement, and other physiological processes in plants. When nitrogen is sufficient, the plant can synthesize more protein to promote cell division and growth, so that the plant leaf area is fast to grow, and more leaf area can be used for photosynthesis. The phosphorus can promote the formation and growth of early root systems, improve the capability of plants to adapt to external environment conditions, and help the plants to endure severe cold in winter. Nitrogen and phosphorus play a vital role in the growth, development and yield of crops. The nitrogen fertilizer utilization rate is usually 25-40% under different crops, different growth stages and different soil conditions, and the phosphate fertilizer utilization rate is usually 10-25%.
Nitrification inhibitors are chemical substances that are capable of inhibiting the bioconversion process of ammonium nitrogen to nitrate nitrogen. The nitrification inhibitor reduces the loss of nitrogen fertilizer in the form of nitrate nitrogen and the influence on the ecological environment by reducing the generation and accumulation of the nitrate nitrogen in soil. DMPP (3, 4-dimethylpyrazole phosphate) is one of the most commonly used nitrification inhibitors in the market, and has been tested on a variety of crops, including wheat, corn, rice, peanut, soybean, etc., and the results indicate that it has a remarkable effect in promoting crop growth and improving nitrogen fertilizer utilization. However, DMPP has a reduced content after long-term storage in fertilizers due to its molecular structure and chemical properties, and thus has a reduced effect of inhibiting the formation of nitrate nitrogen.
In the use process of the phosphate fertilizer, due to the complex environment condition of the soil, the phenomena of chemical precipitation, soil adsorption, closing and storage, biological fixation and the like of phosphorus in the soil can occur, the phosphate fertilizer is quickly fixed by the soil, 30% of phosphorus applied to the soil can be quickly fixed, more than 60% of phosphorus is fixed after 24 hours, so that the plant cannot effectively absorb phosphorus elements, and the utilization rate of the phosphate fertilizer is extremely low.
Disclosure of Invention
The invention provides a nitrogen-phosphorus synergistic agent composition and application thereof.
In the research and development process, the invention discovers that the polymaleic acid, the maleic acid-acrylic acid copolymer or the mixture thereof can obviously improve the stability of the DMPP in the fertilizer, effectively reduce the content reduction of the DMPP in the storage process of the fertilizer and improve the effectiveness of the DMPP in the fertilizer.
Based on the findings, the invention provides the following technical scheme:
in a first aspect, the present invention provides the use of polymaleic acid and/or maleic acid-acrylic acid copolymers to improve the stability of DMPP in fertilisers.
In a second aspect, the present invention provides the use of polymaleic acid and/or maleic acid-acrylic acid copolymers to reduce the loss of DMPP content during storage of fertilizers.
In a third aspect, the present invention provides the use of polymaleic acid and/or maleic acid-acrylic acid copolymers to enhance the effectiveness of DMPP in a DMPP-containing fertiliser.
In the present invention, polymaleic acid is also called hydrolyzed polymaleic anhydride, polymaleic acid and maleic acid-acrylic acid copolymer are all low molecular weight polyelectrolytes, and the molecular weight of polymaleic acid, polymaleic acid and maleic acid-acrylic acid copolymer is not particularly limited, and any commercially available polymaleic acid, polymaleic acid and maleic acid-acrylic acid copolymer meeting general quality requirements can be adopted.
In the above applications, DMPP is mixed with polymaleic acid and/or maleic acid-acrylic acid copolymers.
Preferably, DMPP and polymaleic acid and/or maleic acid-acrylic acid copolymer are mixed according to a mass ratio of 1: (4-25) mixing.
Further preferably, the DMPP is mixed with polymaleic acid and/or maleic acid-acrylic acid copolymer according to a mass ratio of 1: (5-20) mixing.
In the application of the first aspect, the stability refers to the property that the DMPP exists stably during the storage of the fertilizer, and can be specifically expressed as the content retention rate of the DMPP during the storage of the fertilizer, etc.
Instability of DMPP in fertilizers is a common problem for various types of fertilizers containing DMPP, of various compositions. In the above applications, the fertilizer may be any form of fertilizer, including solid and liquid fertilizers, such as compound fertilizers, solid water-soluble fertilizers, liquid fertilizers, and the like. The composition of the fertilizer is not particularly limited, and may include any one or more selected from nitrogen raw materials, phosphorus raw materials, potassium raw materials, macroelements, secondary elements and microelements. Experiments prove that the stabilizing effect of polymaleic acid and/or maleic acid-acrylic acid copolymer on DMPP can be exerted in solid or liquid fertilizer, and the polymaleic acid and/or maleic acid-acrylic acid copolymer has better effect.
In some embodiments of the invention, the fertilizer is a solid fertilizer, preferably a compound fertilizer or a solid water-soluble fertilizer, comprising one or more selected from the group consisting of nitrogen feedstock, phosphorus feedstock, and potassium feedstock.
In some embodiments of the invention, the fertilizer is a liquid fertilizer comprising one or more selected from the group consisting of a nitrogen feedstock, a phosphorus feedstock, and a potassium feedstock.
In the present invention, the storage is a conventional storage condition of fertilizer, such as normal temperature storage.
In a fourth aspect, the present invention provides a nitrogen phosphorus synergist composition comprising DMPP and one or two selected from the group consisting of polymaleic acid, maleic acid-acrylic acid copolymers.
In the nitrogen-phosphorus synergistic agent composition, polymaleic acid, maleic acid-acrylic acid copolymer or a mixture thereof and DMPP are matched to react, so that the stability of the DMPP is obviously improved, the content stability and the effectiveness can be kept in a long-time storage process, and the effect of improving the nitrogen fertilizer utilization rate is exerted; in addition, the polymaleic acid, the maleic acid-acrylic acid copolymer or the mixture thereof can also reduce the possibility of phosphorus fixation by soil and improve the utilization rate of the phosphate fertilizer.
Preferably, in the above-mentioned nitrogen-phosphorus synergist composition, the mass ratio of DMPP to polymaleic acid and/or maleic acid-acrylic acid copolymer is 1: (4-25). Within the above mass ratio range, polymaleic acid, maleic acid-acrylic acid copolymer or a mixture thereof can exert a better function of stabilizing DMPP.
Further preferably, the composition has a mass ratio of DMPP to polymaleic acid and/or maleic acid-acrylic acid copolymer of 1: (5-20).
The nitrogen-phosphorus synergistic agent composition can contain other synergistic agent components capable of improving the utilization rate of nitrogen and phosphorus besides DMPP and one or two selected from polymaleic acid and maleic acid-acrylic acid copolymers, or can be prepared into various agricultural preparation formulations by adding auxiliary materials allowed in the fertilizer field.
In a fifth aspect, the present invention provides the use of a nitrogen-phosphorus booster composition as described above in the preparation of a fertilizer.
In the above applications, the fertilizer may be a solid fertilizer or a liquid fertilizer, including but not limited to compound fertilizers, solid water-soluble fertilizers, liquid fertilizers, and the like. The nitrogen-phosphorus synergistic agent composition disclosed by the invention can be suitable for various different fertilizers, and is wide in applicability.
In a sixth aspect, the present invention provides the use of a nitrogen and phosphorus booster composition as described above to increase the nitrogen and/or phosphorus availability in soil or fertiliser.
In such applications, increasing nitrogen utilization may be manifested as inhibiting the conversion of ammonium nitrogen to nitrate nitrogen, reducing the loss of nitrogen fertilizer in the form of nitrate nitrogen. Increasing phosphorus utilization may be manifested as a reduction in phosphorus fixation and an increase in available phosphorus content.
In a seventh aspect, the present invention provides the use of a nitrogen-phosphorus booster composition as described above in plant cultivation.
DMPP has been shown to be useful in plants such as wheat, corn, rice, peanut, soybean, etc., improving nitrogen fertilizer utilization and promoting plant growth. Because the growth and development of different plants all need nitrogen nutrition, the DMPP has the function of improving the utilization rate of nitrogen fertilizer, and the nitrogen-phosphorus synergistic agent composition is also suitable for planting various plants.
In an eighth aspect, the present invention provides a fertiliser comprising a nitrogen phosphorus synergistic agent composition as described above.
The fertilizer can be a solid fertilizer or a liquid fertilizer, including but not limited to compound fertilizers, solid water-soluble fertilizers, liquid fertilizers, and the like.
The composition of the fertilizer is not particularly limited, and may include any one or more selected from nitrogen raw materials, phosphorus raw materials, potassium raw materials, macroelements, secondary elements and microelements.
In some embodiments of the invention, the fertilizer described above further comprises one or more selected from the group consisting of nitrogen feedstock, phosphorus feedstock, potassium feedstock.
Wherein, the nitrogen raw material can be one or more selected from urea, ammonium sulfate and ammonium chloride; the phosphorus raw material can be one or more selected from monoammonium phosphate (monoammonium phosphate), diammonium phosphate (diammonium phosphate), ammonium polyphosphate, potassium polyphosphate, monopotassium phosphate and dipotassium phosphate; the potassium material may be one or more selected from potassium nitrate, potassium sulfate, potassium chloride, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium polyphosphate, plant ash, potassium salt, potassium magnesium salt, and carnallite.
The fertilizer can also be added with auxiliary materials allowed in the fertilizer field, including but not limited to carriers and the like.
The beneficial effects of the invention at least comprise: the invention discovers the new application of polymaleic acid, maleic acid-acrylic acid copolymer or the mixture thereof in improving the stability of DMPP in the fertilizer, the polymaleic acid, maleic acid-acrylic acid copolymer or the mixture thereof can obviously improve the stability of DMPP in the fertilizer, effectively reduce the content loss of DMPP in the storage process of the fertilizer, improve the effectiveness of DMPP in the fertilizer, enable the DMPP to be more stable and more effectively play the role of inhibiting the conversion of ammonium nitrogen into nitrate nitrogen, enable the nitrogen fertilizer to be longer-acting in soil and improve the utilization rate of the nitrogen fertilizer.
According to the nitrogen-phosphorus synergistic agent composition, polymaleic acid, maleic acid-acrylic acid copolymer or a mixture thereof is matched with DMPP, so that the stability of the DMPP in a fertilizer is obviously improved, the content stability and the effectiveness can be kept in a long-time storage process, the nitrogen fertilizer utilization rate can be effectively improved, the possibility that phosphorus is fixed by soil is reduced, the phosphorus fertilizer utilization rate is improved, and the nitrogen-phosphorus synergistic agent composition has a good application prospect in the fertilizer field.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The various chemicals used in the examples below are commercially available conventional chemicals. Wherein the purity of the DMPP is more than or equal to 98%, the solid content of the polymaleic acid is 50%, and the solid content of the maleic acid-acrylic acid copolymer is 48%.
In the following examples, the compound fertilizers (17-17-17), solid water-soluble fertilizers (20-20-20) and liquid fertilizers (170-110-120) used in the examples are all the same standard unless specified otherwise; wherein, the composition of the compound fertilizer 17-17-17 is as follows: urea (46-0-0) 2.97kg, monoammonium phosphate (12-61-0) 2.79kg, potassium chloride (0-0-62) 2.75kg, bentonite 1.49kg; the solid water-soluble fertilizer comprises the following components in parts by weight: 3.49kg of urea (46-0-0), 3.28kg of monoammonium phosphate (12-61-0), and 3.23kg of potassium chloride (0-0-62); the liquid fertilizer 170-110-120 comprises the following components: 6.36kg of water, 2.40kg of potassium polyphosphate (0-46-50) and 3.70kg of urea (46-0-0). The soil used was from the field test area (pH 6.67, alkaline hydrolysis nitrogen 81.6mg/kg, available phosphorus 38.1mg/kg, quick-acting potassium 107.5 mg/kg) of the developing center of the industrialized agriculture (Linyi) in Linyi city of Shandong province. The method for measuring DMPP in the fertilizer is carried out according to the NY/T3423-2019 standard, and the method for measuring available phosphorus in soil is carried out according to the NY/T1121.7-2014 standard.
Example 1
The embodiment provides a nitrogen-phosphorus synergistic agent composition, which comprises the following components in percentage by mass: DMPP and polymaleic acid of 10.
The effect of polymaleic acid in the nitrogen-phosphorus synergistic agent composition on the stability of DMPP is detected, and the improvement effect of the composition on the phosphorus utilization rate is detected, wherein the method comprises the following steps:
formula 1: uniformly mixing 3g of DMPP with 30g of water, and uniformly blending into 10kg of compound fertilizer (17-17-17);
formula 2: 3g of DMPP and 30g of polymaleic acid are evenly mixed and evenly mixed into 10kg of compound fertilizer (17-17-17).
The DMPP content was measured every 30 days by storing the formulations 1 and 2 at normal temperature, and the measurement results are shown in Table 1.
Table 1 DMPP content (%) and DMPP retention at the end of the experiment (%)
The above formulations 1 and 2 weighed 0.5g, diluted to 500mL with water, poured into 1.5kg of soil uniformly, and stood for 72 hours, and the content of available phosphorus in the soil was measured, and the measurement results are shown in Table 2.
TABLE 2 effective phosphorus content in soil after 72h of different treatments
Example 2
The embodiment provides a nitrogen-phosphorus synergistic agent composition, which comprises the following components in percentage by mass: 20 DMPP and polymaleic acid.
The effect of polymaleic acid in the nitrogen-phosphorus synergistic agent composition on the stability of DMPP is detected, and the improvement effect of the composition on the phosphorus utilization rate is detected, wherein the method comprises the following steps:
formula 1: uniformly mixing 3g of DMPP with 60g of water, and uniformly blending into 10kg of compound fertilizer (17-17-17);
formula 2: 3g of DMPP and 60g of polymaleic acid are evenly mixed and evenly mixed into 10kg of compound fertilizer (17-17-17).
The DMPP content was measured every 30 days by storing the formulations 1 and 2 at normal temperature, and the measurement results are shown in Table 3.
TABLE 3 DMPP content (%) and DMPP retention at the end of the experiment for different treatment periods (%)
The above formulations 1 and 2 weighed 0.5g, diluted to 500mL with water, poured into 1.5kg of soil uniformly, and stood for 72 hours, and the content of available phosphorus in the soil was measured, and the measurement results are shown in Table 4.
TABLE 4 effective phosphorus content in soil after 72h of different treatments
Example 3
The embodiment provides a nitrogen-phosphorus synergistic agent composition, which comprises the following components in percentage by mass: 5 DMPP and polymaleic acid.
The effect of polymaleic acid in the nitrogen-phosphorus synergistic agent composition on the stability of DMPP is detected, and the improvement effect of the composition on the phosphorus utilization rate is detected, wherein the method comprises the following steps:
formula 1: uniformly mixing 3g of DMPP with 15g of water, and uniformly blending into 10kg of compound fertilizer (17-17-17);
formula 2: 3g of DMPP and 15g of polymaleic acid are evenly mixed and evenly mixed into 10kg of compound fertilizer (17-17-17).
The DMPP content was measured every 30 days by storing the formulations 1 and 2 at normal temperature, and the measurement results are shown in Table 5.
TABLE 5 DMPP content (%) and DMPP retention at the end of the experiment for different treatment periods (%)
The above formulations 1 and 2 weighed 0.5g, diluted to 500mL with water, poured into 1.5kg of soil uniformly, and stood for 72 hours, and the content of available phosphorus in the soil was measured, and the measurement results are shown in Table 6.
TABLE 6 effective phosphorus content in soil after 72h of different treatments
Example 4
The embodiment provides a nitrogen-phosphorus synergistic agent composition, which comprises the following components in percentage by mass: 15 DMPP and polymaleic acid.
The effect of polymaleic acid in the nitrogen-phosphorus synergistic agent composition on the stability of DMPP is detected, and the improvement effect of the composition on the phosphorus utilization rate is detected, wherein the method comprises the following steps:
formula 1: uniformly mixing 3g of DMPP with 45g of water, and uniformly blending into 10kg of solid water-soluble fertilizer (20-20-20);
formula 2: 3g of DMPP and 45g of polymaleic acid are evenly mixed and evenly mixed into 10kg of solid water-soluble fertilizer (20-20-20).
The DMPP content was measured every 30 days by storing the formulations 1 and 2 at normal temperature, and the measurement results are shown in Table 7.
TABLE 7 DMPP content (%) and DMPP retention at the end of the experiment for different treatment periods (%)
The above formulations 1 and 2 weighed 0.5g, diluted with water to 500mL, poured into 1.5kg of soil uniformly, and stood for 72 hours, and the content of available phosphorus in the soil was measured, and the measurement results are shown in Table 8.
TABLE 8 effective phosphorus content in soil after 72h of different treatments
Example 5
The effect of polymaleic acid on DMPP stability in the nitrogen-phosphorus synergist composition of example 1 was tested and the improvement effect of the composition on phosphorus utilization was specifically as follows:
formula 1: uniformly mixing 3g of DMPP with 30g of water, and uniformly blending into 10kg of liquid fertilizer (170-110-120);
formula 2: 3g of DMPP and 30g of polymaleic acid are evenly mixed and evenly mixed into 10kg of liquid fertilizer (170-110-120).
The DMPP content was measured every 30 days by storing the formulations 1 and 2 at normal temperature, and the measurement results are shown in Table 9.
TABLE 9 DMPP content (%) and DMPP retention at the end of the experiment for different treatment periods (%)
The above formulations 1 and 2 weighed 0.5g, diluted to 500mL with water, poured into 1.5kg of soil uniformly, and stood for 72 hours, and the content of available phosphorus in the soil was measured, and the measurement results are shown in Table 10.
TABLE 10 effective phosphorus content in soil after 72h of different treatments
Example 6
The embodiment provides a nitrogen-phosphorus synergistic agent composition, which comprises the following components in percentage by mass: 10 and maleic acid-acrylic acid copolymer.
The effect of the maleic acid-acrylic acid copolymer in the nitrogen-phosphorus synergistic agent composition on the stability of DMPP is detected, and the effect of the composition on improving the utilization rate of phosphorus is detected as follows:
formula 1: uniformly mixing 3g of DMPP with 30g of water, and uniformly blending into 10kg of compound fertilizer (17-17-17);
formula 2: DMPP 3g was uniformly mixed with 30g of a maleic acid-acrylic acid copolymer, and uniformly mixed into 10kg of a compound fertilizer (17-17-17).
The DMPP content was measured every 30 days by storing the formulations 1 and 2 at normal temperature, and the measurement results are shown in Table 11.
Table 11 DMPP content (%) and DMPP retention at the end of the experiment (%)
The above formulations 1 and 2 weighed 0.5g, diluted with water to 500mL, poured into 1.5kg of soil uniformly, and stood for 72 hours, and the content of available phosphorus in the soil was measured, and the measurement results are shown in Table 12.
TABLE 12 effective phosphorus content in soil after 72h of different treatments
Example 7
The embodiment provides a nitrogen-phosphorus synergistic agent composition, which comprises the following components in percentage by mass: 10 with polymaleic acid and maleic acid-acrylic acid copolymer.
The effect of polymaleic acid and maleic acid-acrylic acid copolymer in the nitrogen-phosphorus synergistic agent composition on DMPP stability is detected, and the improvement effect of the composition on the phosphorus utilization rate is specifically as follows:
formula 1: uniformly mixing 3g of DMPP with 30g of water, and uniformly blending into 10kg of compound fertilizer (17-17-17);
formula 2: 3g of DMPP, 20g of polymaleic acid and 10g of maleic acid-acrylic acid copolymer are uniformly mixed and uniformly mixed into 10kg of compound fertilizer (17-17-17).
The DMPP content was measured every 30 days by storing the formulations 1 and 2 at normal temperature, and the measurement results are shown in Table 13.
TABLE 13 DMPP content (%) and DMPP retention at the end of the experiment for different treatment periods (%)
The above formulations 1 and 2 weighed 0.5g, diluted with water to 500mL, poured into 1.5kg of soil uniformly, and stood for 72 hours, and the content of available phosphorus in the soil was measured, and the measurement results are shown in Table 14.
TABLE 14 effective phosphorus content in soil after 72h of different treatments
Example 8
The embodiment provides a nitrogen-phosphorus synergistic agent composition, which comprises the following components in percentage by mass: 20 and maleic-acrylic acid copolymer.
The effect of the maleic acid-acrylic acid copolymer in the nitrogen-phosphorus synergistic agent composition on the stability of DMPP is detected, and the effect of the composition on improving the utilization rate of phosphorus is detected as follows:
formula 1: uniformly mixing 3g of DMPP with 60g of water, and uniformly blending into 10kg of compound fertilizer (17-17-17);
formula 2: DMPP 3g was uniformly mixed with 60g of a maleic acid-acrylic acid copolymer, and uniformly mixed into 10kg of a compound fertilizer (17-17-17).
The DMPP content was measured every 30 days by storing the formulations 1 and 2 at normal temperature, and the measurement results are shown in Table 15.
TABLE 15 DMPP content (%) and DMPP retention at the end of the experiment for different treatment periods (%)
The above formulations 1 and 2 weighed 0.5g, diluted with water to 500mL, poured into 1.5kg of soil uniformly, and stood for 72 hours, and the content of available phosphorus in the soil was measured, and the measurement results are shown in Table 16.
TABLE 16 effective phosphorus content in soil after 72h of different treatments
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. Use of polymaleic acid and/or maleic acid-acrylic acid copolymers to improve the stability of DMPP in fertilizers.
2. Use of polymaleic acid and/or maleic acid-acrylic acid copolymers for reducing the loss of DMPP content during storage of fertilizers.
3. Use of polymaleic acid and/or maleic acid-acrylic acid copolymers for increasing the effectiveness of DMPP in a DMPP-containing fertilizer.
4. The use according to any one of claims 1 to 3, wherein in the use, DMPP and polymaleic acid and/or maleic acid-acrylic acid copolymer are mixed according to a mass ratio of 1: (4-25) mixing.
5. A nitrogen-phosphorus synergist composition, characterized in that the composition comprises DMPP and one or two selected from polymaleic acid, maleic acid-acrylic acid copolymer.
6. The nitrogen-phosphorous synergist composition according to claim 5, wherein the mass ratio of DMPP to polymaleic acid and/or maleic-acrylic acid copolymer in the composition is 1: (4-25).
7. The nitrogen-phosphorus booster composition of claim 6 wherein the mass ratio of DMPP to polymaleic acid and/or maleic-acrylic acid copolymer in the composition is 1: (5-20).
8. Use of the nitrogen-phosphorus synergistic agent composition as claimed in any one of claims 5 to 7 in the preparation of fertilizers.
9. The use of the nitrogen-phosphorus synergistic agent composition as claimed in any one of claims 5 to 7 in improving the nitrogen and/or phosphorus utilization rate in soil or fertilizer.
10. Use of the nitrogen-phosphorus synergistic agent composition as claimed in any one of claims 5 to 7 in plant cultivation.
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CN115490565A (en) * 2022-06-30 2022-12-20 金正大生态工程集团股份有限公司 Slow fertilizer and preparation method thereof
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