Emission reduction and yield increase double-inhibitor nitrogen fertilizer for rice field and preparation method and application thereof

Abstract

The invention belongs to the technical field of agriculture, and particularly relates to a rice field emission reduction and yield increase double-inhibitor nitrogen fertilizer and a preparation method and application thereof. According to the invention, low-dose double inhibitors NBPT and DMPP are uniformly wrapped in large-granule urea by adopting a biological agent, large-scale production is easy to realize, and a yield-increasing and emission-reducing application technology is provided, so that nitrogen loss in various ways in a rice field is reduced, the nitrogen absorption capability of rice is enhanced, the tillering capability of rice is improved, tillering and panicle formation are ensured, the yield and the nitrogen fertilizer utilization efficiency are improved, and the application prospect is wide. The method is safe, efficient and convenient for large-scale use.

Description

Technical Field

[0001] This invention belongs to the field of agricultural technology, specifically relating to a dual-inhibitor nitrogen fertilizer for reducing emissions and increasing yield in paddy fields, its preparation method, and its application. Background Technology

[0002] Chemical nitrogen fertilizer is a high-consumption agricultural product. Traditional chemical nitrogen fertilizers, due to their chemical properties, have the drawback of rapid release after application to farmland, resulting in a mismatch between nutrient release and crop needs. To achieve high yields, farmers often apply large amounts of nitrogen fertilizer multiple times, leading to a nitrogen fertilizer utilization rate in crops that is generally below 40% for the current season. Rice paddies are a typical example of crop cultivation with high nitrogen application rates, significant nitrogen fertilizer losses, and low nitrogen fertilizer utilization rates. Unabsorbed nitrogen fertilizer leaves the farmland through various pathways, causing enormous resource waste and economic losses. Furthermore, large amounts of nitrogen fertilizer leave as reactive nitrogen pollutants (ammonia / ammonia NH3 / NH4). + nitrate NO3 - Nitrogen fertilizers, in the form of nitrous oxide (N2O), enter the atmosphere and water bodies, damaging ecological functions and causing problems such as human health. Therefore, under the premise of ensuring food security, reducing nitrogen fertilizer use while increasing efficiency and reducing pollutant emissions are directly related to the realization of green and high-quality agricultural development. Developing cost-effective, efficiency-enhancing, and emission-reducing nitrogen fertilizers suitable for widespread application is an important way to solve the problem of sustainable development in the planting industry.

[0003] Urea is the most abundant nitrogen fertilizer due to its high nitrogen content, low cost, and ease of storage and application. However, after being applied to paddy fields, urea is completely hydrolyzed into NH4 by urease within 1-2 days. + NH3 is easily lost through volatilization, while NH4... + It is then converted into NO3 through nitration. - NO3 - Urea is easily leached into groundwater or lost through denitrification, and it readily produces the greenhouse gas N2O during the nitrification-denitrification process. Urease inhibitors have been widely proven to slow down the hydrolysis process of urea after application to farmland, thereby reducing the loss of NH3 through volatilization. Butylthiophosphoric triamine (NBPT) slows down urea hydrolysis by competitively binding to the active site of urease. Due to its high efficiency, non-toxicity, and lack of residue, it is currently the most widely used and commercially available urease inhibitor. However, NBPT is easily decomposed at temperatures exceeding 50°C and is poorly soluble in water. 3,4-Dimethylpyrazole phosphate (DMPP) inhibits NH4+ by affecting the activity of ammonia monooxygenase. + To NO3 -The conversion process is characterized by low dosage, stable effects, and no residue, making it a promising area for application. Current experimental studies have extensively reported the effects of NBPT and DMPP on urea conversion, reactive nitrogen emissions, crop yield, and nitrogen fertilizer utilization. These studies have found that using a single inhibitor only suppresses a specific nitrogen emission process while exacerbating nitrogen losses in other processes. For example, nitrification inhibitors generally increase NH3 volatilization, and urease inhibitors inhibit the decomposition into NH4. + The subsequent process is unaffected. The combined use of NBPT and DMPP can synergistically enhance their effects, but the proportions of inhibitors added vary in current studies, and the optimal ratio for increasing production and reducing emissions remains unknown. Current research reports indicate that NBPT and DMPP typically account for 0.4% to 1% of the urea weight.

[0004] To date, some technologies have provided a method of using NBPT and DMPP inhibitors separately coated and then simply mixed with ordinary urea. However, the amount of NBPT and DMPP added in this patent is too high, ranging from 0.8% to 1.7% of the urea weight, which is 8% to 17% per ton of urea. The cost of the pure inhibitor (kg) is close to that of urea itself. Secondly, the dual-inhibitor addition method in this technology involves separately coating and granulating the solid inhibitors before mixing them with urea for application. This makes it difficult for the inhibitors to bind evenly with urea. More importantly, the patented method of coating the inhibitors before mixing them with urea before application makes it difficult for the NBPT inhibitor to effectively inhibit urea hydrolysis after being applied to paddy fields. This is because NBPT cannot directly inhibit urea hydrolysis; it needs to be oxidized to NBPTo to have an inhibitory effect. The coating will hinder the release and oxidation of NBPT. The test results of this patent also confirmed that the inhibitory effect on NH3 volatilization is limited. With the reduction of nitrogen application, NH3 volatilization was reduced by only 11.3%, and organic polyolefins were also introduced into the farmland. Therefore, the cost of the inhibitor material in this patent, plus the cost of the coating process, results in an excessively high additional price per ton of urea. Moreover, the application method in this patent has limited effects on the reduction of NH3 and N2O emissions and the increase in rice yield. The benefits generated are far lower than the additional cost of the fertilizer, which has made it difficult for this type of fertilizer to be widely used to date.

[0005] In existing NBPT addition technologies, preparing the powder into a liquid formulation is the main approach, but this method undoubtedly introduces various organic solvents. Moreover, currently available inhibitors on the market are almost all single-inhibitor products, such as Koch's Agrotain and BASF's Limus products containing NBPT, and Compo's Noretac series products containing DMPP. The inhibitor addition process is the biggest challenge in the innovation of inhibitor-based nitrogen fertilizers. Currently, both the dosage and the method of addition present technical difficulties. High dosages and complex processes result in high additional costs per ton of inhibitor-based nitrogen fertilizer. Furthermore, the unstable yield-increasing effect due to the lack of easily applicable methods leads to low cost-effectiveness, making these fertilizers unacceptable to users and hindering their widespread use. Therefore, breakthroughs in low-cost inhibitor addition technologies and their application methods are urgently needed.

[0006] It is also important to clarify that the fundamental purpose of adding inhibitors and other substances to ordinary nitrogen fertilizers is to better supply nitrogen nutrition to crops in order to optimize crop yield and economic and environmental benefits. It is not about the longer the inhibition time, the better, but rather about using safe, efficient, low-cost, and convenient production and application methods to provide crops with the best nitrogen nutrition while simultaneously reducing pollutant emissions. Currently, there are no reports on low-dose NBPT and DMPP dual-inhibitor nitrogen fertilizers with zero organic solvent addition and their applications for emission reduction and yield enhancement. Summary of the Invention

[0007] To address the aforementioned problems, the present invention aims to provide a novel nitrogen fertilizer and its application with dual inhibitors for reducing emissions and increasing yield in paddy fields. This invention is the first to use biological agents to uniformly encapsulate low doses of the dual inhibitors NBPT and DMPP into large-particle urea, facilitating large-scale production. It also provides a yield-increasing and emission-reducing application technology, thereby reducing nitrogen loss through various pathways in paddy fields, enhancing rice's nitrogen absorption capacity, improving rice tillering ability and ensuring tillering into panicles, increasing yield and nitrogen fertilizer utilization efficiency, and enabling safe, efficient, and convenient large-scale application.

[0008] To achieve the above objectives, the present invention provides a dual-inhibitor nitrogen fertilizer for reducing emissions and increasing yield in paddy fields, wherein the nitrogen fertilizer comprises large-particle urea, a bio-encapsulating agent, a urease inhibitor, a nitrification inhibitor, and a uniformity indicator; The components of the bio-encapsulating agent, by weight percentage, are: 80% amylopectin, 6% dextrin, 0.2% potassium sorbate, and 13.8% water; The amount of the bio-encapsulating agent added is 0.625% of the weight of the large-particle urea; The urease inhibitor is n-butylthiophosphoric triamine, and the amount of urease inhibitor added is 0.14% of the weight of the large-particle urea. The nitration inhibitor is 3,4-dimethylpyrazole phosphate, and the amount of the nitration inhibitor added is 0.075% of the weight of the large-particle urea. The uniformity indicator is black potassium humate powder, and the amount of the uniformity indicator added is 0.12% of the weight of the large-particle urea. In the practical application of this invention, the large-particle urea is a conventional commercially available large-particle urea with a particle size of 2~4.8mm and a nitrogen content of ≥46%.

[0009] In this invention, the dosage form of the bio-encapsulating agent is semi-fluid.

[0010] This invention also provides a method for preparing a dual-inhibitor nitrogen fertilizer for reducing emissions and increasing yield in paddy fields, the preparation method comprising the following steps: (1) Mix the bio-encapsulating agent, urease inhibitor, nitrification inhibitor and uniformity indicator to obtain a mixture; In the actual operation of this invention, the above-mentioned raw materials are pre-mixed by a high-speed disperser to form a mixture; (2) Place the large granulated urea in a round pot granulation and coating machine, add the mixture to the large granulated urea seed, and dry to obtain the double inhibitor nitrogen fertilizer for reducing emissions and increasing yield in paddy fields. The weight ratio of the mixture to large-particle urea is 9.6:1000; The rotational speed of the circular pot granulator and coating machine is 16~18 r / min.

[0011] In the actual operation of this invention, the above mixture is slowly added to rotating large granular urea at multiple points (addition speed is 5 kg / min) so that it is evenly coated on the surface of the large granular urea. After the mixture and the large granular urea are evenly mixed and have a uniform color, it is dried at room temperature by forced air drying to obtain nitrogen fertilizer.

[0012] This invention provides the application of the above-mentioned nitrogen fertilizer or the nitrogen fertilizer prepared by the above-mentioned preparation method in paddy field fertilization.

[0013] In this invention, the nitrogen fertilizer is applied 4 to 5 times throughout the entire growth period of rice; The application points include: base fertilizer, tillering fertilizer, heading fertilizer, and fertilizer to prevent floret degeneration. Specifically, it is applied as base fertilizer before transplanting, as tillering fertilizer in the middle of tillering (if the seedlings are small, the tillering fertilizer is applied twice, once in the early stage and once in the middle of tillering), as heading fertilizer in the early stage of panicle development, and as fertilizer to prevent floret degeneration in the middle of panicle development. The weight ratio of the base fertilizer, tillering fertilizer, heading fertilizer, and anti-flower degeneration fertilizer is 3:3:2:2; when the tillering fertilizer is applied twice, once in the early tillering stage and once in the middle tillering stage, the weight ratio is 3:1:2:2:2.

[0014] In this invention, when the fertilization target is single-season rice, the total amount of nitrogen fertilizer applied is 36-43 kg per mu, which is equivalent to 18 kg of pure nitrogen per mu. When the fertilization target is double-cropping rice, the amount of nitrogen fertilizer applied to each season of rice should be 65% to 70% of the amount applied to single-cropping rice.

[0015] In practice, the nitrogen fertilizer provided by this invention can be applied by drone. After the base fertilizer is applied, the soil should be leveled before transplanting. When applying subsequent topdressing (i.e., tillering fertilizer, heading fertilizer, and fertilizer to prevent flower degeneration), it is recommended to apply the fertilizer in a dry or shallow water layer, and then irrigate. Attached Figure Description

[0016] Figure 1 NH4+ in paddy field surface water after applying NBPT at different ratios + Dynamic changes in -N concentration; Figure 2 Dynamic changes in NH3 volatilization after NBPT is applied to paddy fields in different proportions with DMPP; Figure 3 The effects of NBPT combined with different proportions of DMPP on rice yield and nitrogen fertilizer utilization in paddy fields; Figure 4 After application of the novel dual-inhibitor nitrogen fertilizer, NH4 in the field surface water + -N dynamic change characteristic map; Figure 5 A graph showing the dynamic changes in pH value of field surface water after the application of a novel dual-inhibitor nitrogen fertilizer; Figure 6 The study investigated the dynamic changes, total loss, and emission reduction ratio of NH3 volatilization loss after the application of the novel dual-inhibitor nitrogen fertilizer. Figure 7 The study investigated the dynamic changes, cumulative emissions, and emission reduction ratios of N2O after the application of the novel dual-inhibitor nitrogen fertilizer. Figure 8 A comparison of rice growth and tiller number in the late tillering stage between fields using the new dual-inhibitor nitrogen fertilizer and those using ordinary nitrogen fertilizer; Figure 9 This study compares the growth of rice and the number of effective panicles per mu in the early grain-filling stage between fields using a novel dual-inhibitor nitrogen fertilizer and those using ordinary nitrogen fertilizer. Detailed Implementation

[0017] The specific embodiments of the present invention will be described below with reference to the accompanying drawings and examples. However, the following examples are only used to illustrate the present invention in detail and do not limit the scope of the present invention in any way.

[0018] It should be noted that, regarding the numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this application. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0019] Unless otherwise specified, the instruments and equipment involved in the following embodiments are all conventional instruments and equipment; the reagents involved are all commercially available conventional reagents; and the test methods involved are all conventional methods unless otherwise specified.

[0020] Unless otherwise stated, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention is described. While only preferred methods and materials are described herein, any methods and materials similar to or equivalent to those described herein may be used in the implementation or testing of this application. All references to this specification are incorporated by way of citation to disclose and describe the methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0021] Example 1 Effects of different NBPT ratios on the hydrolysis process of urea after fertilization The specific implementation method is as follows: A field micro-plot experiment was conducted, setting up different ratios of NBPT to urea by weight. The specific ratios were 0%, 0.05%, 0.14%, 0.18%, 0.22%, and 1% of the urea by weight. Each treatment was repeated three times. The micro-plot was a 50 cm diameter cylinder, pressed 30 cm into the paddy field soil. Before rice transplanting, urea containing different proportions of NBPT was applied to the micro-plot at a nitrogen application rate (pure nitrogen) of 81 kg / ha, mixed thoroughly with the topsoil, and then transplanted. After fertilization, NH4 levels were measured daily from the surface water. + -N concentration.

[0022] The test results showed that adding different proportions of NBPT could delay the hydrolysis of urea, with the most significant effect observed on the second day after fertilization. Specifically, ordinary urea was rapidly hydrolyzed after application, resulting in a decrease in NH4+ in the field surface water. + -N concentration increased rapidly, while NH4+ concentration increased rapidly in all NBPT-added treatments. + -N concentration increased only slightly, remaining at only 13-20% of that in conventional urea treatment. By day 3, the NH4+ concentration in the NBPT-containing treatment... + -N began to rise significantly, with the slowest increase observed in the treatment containing 0.14% NBPT. Figure 1 This indicates that a 0.14% NBPT content can effectively reduce the urea hydrolysis process and also has an effect on NH4+. + -N concentration has a stable inhibitory effect. Adding too much NBPT not only increases fertilizer production costs, but also has no difference in the inhibitory effect on urea hydrolysis and NH3 volatilization compared to low concentration NBPT.

[0023] Example 2 Effects of NBPT and different proportions of DMPP on NH3 volatilization after fertilization in paddy fields The specific implementation method is as follows: In the field experiment, the effect of combined application of NBPT and different proportions of DMPP on NH3 volatilization during the tillering fertilizer period of paddy fields was set. This period is the fertilization period when NH3 volatilization in paddy fields is the most serious. According to the results of implementation example 1, the proportion of NBPT used was 0.14% of the weight of urea, and two typical proportions of DMPP were selected, namely 0.8% and a low proportion of 0.075% selected in most current experimental studies. Each treatment was repeated three times.

[0024] During the mid-tillering stage of rice, a dual-inhibitor nitrogen fertilizer containing NBPT and two proportions of DMPP was applied to the paddy field at a rate of 81 kg / ha (5.4 kg N per mu). The fertilizer was broadcast onto the surface. After fertilization, the NH3 volatilization flux was measured daily using a closed-chamber extraction method. Measurements were taken daily from 8:30 AM to 9:30 AM, with a sample collection time of 1 hour per day. The volatilization amount collected during this period was used as the daily average flux to calculate the daily volatilization amount. The measurement procedure was as follows: Under the negative pressure of a vacuum pump, external air was introduced into the extraction chamber at an exchange rate of 10 times per minute to balance the air pressure inside and outside the chamber, achieving gas exchange. The extracted NH3-containing gas, carried by the airflow, entered a gas washing bottle and was absorbed by the acidic absorbent liquid inside the bottle, converting gaseous NH3 into NH4. + -N, and then the NH4 in the absorption liquid was measured. + -N, combined with the volume of the absorbent liquid, the NH3 volatilization flux during the sampling period can be calculated using the following formula:

[0025] In the formula: F NH3 c represents the NH3 volatilization flux (kg N / ha / d); c represents the NH4+ in the absorbent. + -N concentration (mg N / L); v is the volume of absorbent liquid (L); 10 -6 Convert mg to kg; t is the daily sampling time (h); r is the radius of the extraction chamber (m); 10 -4 For m 2 Convert to ha; Total NH3 volatilization (kg N / ha) is the cumulative value of daily volatilization during the sampling period.

[0026] The test results showed that when NBPT and DMPP were used in combination, the inhibitory effect of NBPT on NH3 volatilization was weakened with the increase of DMPP addition. Figure 2 The NH3 volatilization loss when the DMPP addition amount is 0.8% is 1.2 times that when the addition amount is 0.075%. Therefore, when NBPT and DMPP are used in combination, the proportion of DMPP used should be reduced.

[0027] Example 3 Effects of urease inhibitor NBPT and different nitrification inhibitor DMPP ratios on rice yield and nitrogen fertilizer use efficiency The specific implementation method is as follows: In the field experiment, NBPT was applied in combination with different proportions of DMPP. According to Implementation Example 1, the proportion of NBPT used was 0.14% of the weight of urea. Three typical proportions of DMPP were selected: no DMPP added, DMPP added at 0.8% of the weight of urea, and DMPP added at 0.075%. Each treatment was repeated three times. The total nitrogen application was 270 kg N / ha (18 kg of pure nitrogen per mu). It was applied in three times. The ratio of base fertilizer, tillering fertilizer, and heading fertilizer was 4:3:3. After the base fertilizer was spread, it was mixed with the topsoil. The topsoil was then spread.

[0028] When rice matures, the above-ground parts are sampled and measured. After air-drying, they are weighed. Representative grain and straw samples are taken from each micro-plot to determine nitrogen content, calculate nitrogen uptake and nitrogen fertilizer utilization rate. The formula for calculating nitrogen fertilizer utilization rate is: NUE = (Nitrogen uptake in nitrogen treatment - Nitrogen uptake in blank area) / Nitrogen uptake * 100.

[0029] The results showed that, compared with ordinary urea treatment, under the same nitrogen application rate and method, NBPT alone did not significantly increase rice yield. However, the combined use of NBPT and DMPP significantly improved rice yield and nitrogen fertilizer utilization, increasing yield by 5% and nitrogen fertilizer utilization by 16.8%. There was no significant difference in rice yield and nitrogen fertilizer utilization between high-proportion DMPP and low-proportion DMPP treatments. Figure 3 This indicates that the combined application of low-ratio DMPP and NBPT can achieve the best yield-increasing effect of dual inhibitors.

[0030] Example 4 Characteristics of nitrogen concentration in paddy field surface water after application of novel dual-inhibitor nitrogen fertilizer The specific implementation method is as follows: Two control treatments were set up in the field plot experiment: a novel dual-inhibitor nitrogen fertilizer and ordinary urea treatment. Each treatment was repeated three times, with a plot area of ​​40 m². 2 Before rice transplanting, the new dual-inhibitor nitrogen fertilizer was applied at a rate of 108 kg / ha (7.2 kg N per mu). After spreading the fertilizer, it was raked evenly into the topsoil. Transplanting was then carried out on the same day. The nitrogen application rate and operation method for the urea treatment were the same as those for the new dual-inhibitor nitrogen fertilizer. After fertilization, NH4 levels were measured daily from the surface water. + -N concentration and pH directly determine the amount of NH3 volatilization loss from nitrogen fertilizer. The results show that the novel dual-inhibitor nitrogen fertilizer can significantly reduce NH4+ in field surface water after fertilization. + -N concentration ( Figure 4 The decrease was 30%, and it also reduced the NH4+ level in the field surface water after fertilization. + pH at different concentration periods Figure 5 Therefore, it can reduce the risk of loss through various pathways after nitrogen fertilizer is applied.

[0031] Example 5 The emission reduction effect of novel dual-inhibitor nitrogen fertilizer on reactive nitrogen emissions from paddy fields In this implementation example, a field plot experiment was conducted, with two treatments: a novel dual-inhibitor nitrogen fertilizer and a conventional urea treatment. Both treatments had the same nitrogen application rate, with a total nitrogen application rate of 270 kg N / ha. The ratio of basal fertilizer, tillering fertilizer, and heading fertilizer was 4:3:3. After the basal fertilizer was applied, it was mixed with the topsoil, and then the topsoil was applied.

[0032] Reactive nitrogen emissions, including NH3 volatilization and nitrous oxide (N2O) emissions, were measured using currently accepted standard methods. N2O emissions were simultaneously sampled and measured using a static chamber method combined with an automated sampling system. N2O concentration was detected using gas chromatography, with the concentration of N2O in the gas measured by a 63Ni electron capture detector (ECD). The carrier gas was argon-methane, the chamber temperature was 40°C, and the detector temperature was measured at 300°C. The N2O flux was calculated using the following formula:

[0033] In the formula: F is the gas flux (µg N / m³) 2 / h); ρ is the gas density under standard atmospheric conditions (1.25 g / L); dc / dt is the rate of change of gas concentration inside the chamber (ppb / min); V is the chamber volume (m³). 3 A is the static bottom area of ​​the box (m²). 2 T is the temperature inside the chamber (°C) at the time of sampling.

[0034] Continuous monitoring results after three fertilizations showed that, Figure 6 As shown, the new dual-inhibitor nitrogen fertilizer reduced the amount of NH3 volatilization loss in paddy fields. For the total loss throughout the entire growth period, under the same nitrogen application rate and fertilization method, the NH3 loss was reduced by 25%.

[0035] The new dual-inhibitor nitrogen fertilizer also reduced N2O emissions generated during nitrification / denitrification in paddy fields, with a reduction rate of 40%. Figure 7 ).

[0036] Example 6 The effect of dual-inhibitor novel nitrogen fertilizer on improving rice growth indicators and yield components To verify the yield-increasing effect of the dual-inhibitor nitrogen fertilizer in this invention on a large-scale paddy field, this example was demonstrated and applied on a large scale in Xinzhuang Town, Changshu City, Jiangsu Province. The entire process was mechanized, and the fertilization method was drone application. The specific experimental scheme was as follows: the dual-inhibitor nitrogen fertilizer was applied to the paddy field in 4 applications, with a total nitrogen application rate of 270 kg N / ha (18 kg of pure nitrogen per mu). The ratio of base fertilizer: tillering fertilizer: booting fertilizer: anti-horn degeneration fertilizer was 3:3:2:2. After the base fertilizer was spread, it was mixed with the surface mud by rotary tillage before transplanting. Tillering fertilizer was applied in the middle of tillering, booting fertilizer was applied in the early stage of panicle development, and anti-horn degeneration fertilizer was applied in the middle of panicle development.

[0037] The total nitrogen application rate for the control plot was 330 kg N / ha (22 kg pure nitrogen per mu), applied in 5 applications, all by drone. The base fertilizer and the heading fertilizer were ordinary compound fertilizers, and the two tillering fertilizers were ordinary urea. The base fertilizer was applied one week before transplanting, the tillering fertilizer was applied in the early and middle-late tillering stages, and the heading fertilizer was applied in the early panicle development stage and before heading. The nitrogen application ratio was 0.28:0.22:0.10:0.23:0.09.

[0038] The two fertilizer treatments used fields with the same cultivation history, fertility level, rice variety, transplanting density, and irrigation, pesticide, and herbicide management methods. The experimental results are as follows: Figure 8 and Figure 9 As shown. Although the nitrogen content was reduced by 18% with dual-inhibitor nitrogen fertilizer, in the example paddy fields, it was found in the late tillering stage that the number of rice tillers in the dual-inhibitor nitrogen fertilizer field was significantly higher than that in the ordinary fertilizer field. Figure 8 The number of rice tillers in fields treated with the new dual-inhibitor nitrogen fertilizer was 22% higher than that treated with ordinary nitrogen fertilizer.

[0039] In the early stage of grain filling, the effective number of panicles in the two types of nitrogen-fertilized fields was measured in the field. The effective number of panicles in the new dual-inhibitor nitrogen fertilizer field was 240,000-260,000 per mu, while the effective number of panicles in the ordinary urea + compound fertilizer field was 210,000-215,000 per mu. Figure 9 The new dual-inhibitor nitrogen fertilizer is 17% higher.

[0040] Regarding rice yield, the yield of the new nitrogen fertilizer with dual inhibitors was 702 kg / mu, which was 10.2% higher than that of the ordinary urea-compound fertilizer field.

[0041] The production costs of the two fertilizer input methods were calculated. Compared with the ordinary urea-compound fertilizer application mode, the nitrogen fertilizer cost of the new dual-inhibitor nitrogen fertilizer application mode can be reduced by 20-30% per mu.

[0042] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A nitrogen fertilizer with dual inhibitors for reducing emissions and increasing yield in paddy fields, characterized in that, The nitrogen fertilizer includes large-particle urea, a bio-encapsulating agent, a urease inhibitor, a nitrification inhibitor, and a uniformity indicator; The components of the bio-encapsulating agent, by weight percentage, are: 80% amylopectin, 6% dextrin, 0.2% potassium sorbate, and 13.8% water; The amount of the bio-encapsulating agent added is 0.625% of the weight of the large-particle urea; The urease inhibitor is n-butylthiophosphoric triamine, and the amount of urease inhibitor added is 0.14% of the weight of the large-particle urea. The nitration inhibitor is 3,4-dimethylpyrazole phosphate, and the amount of the nitration inhibitor added is 0.075% of the weight of the large-particle urea. The uniformity indicator is black potassium humate powder, and the amount of the uniformity indicator added is 0.12% of the weight of the large-particle urea.

2. The nitrogen fertilizer according to claim 1, characterized in that, The biological encapsulation agent is in a semi-fluid form.

3. A method for preparing a nitrogen fertilizer with dual inhibitors for reducing emissions and increasing yield in paddy fields, characterized in that, The preparation method includes the following steps: (1) Mix the bio-encapsulating agent, urease inhibitor, nitrification inhibitor and uniformity indicator to obtain a mixture; (2) Place the large granulated urea in a round pot granulation and coating machine, add the mixture to the large granulated urea seed, and dry to obtain the double inhibitor nitrogen fertilizer for reducing emissions and increasing yield in paddy fields. The weight ratio of the mixture to large-particle urea is 9.6:1000; The rotational speed of the circular pot granulator and coating machine is 16~18 r / min.

4. The application of the nitrogen fertilizer according to claim 1 or 2 or the nitrogen fertilizer prepared by the preparation method according to claim 3 in paddy field fertilization.

5. The application according to claim 4, characterized in that, The nitrogen fertilizer is applied 4 to 5 times throughout the entire growth period of rice; The application points include: base fertilizer, tillering fertilizer, heading fertilizer, and fertilizer to prevent floret degeneration; The weight ratio of the applied base fertilizer, tillering fertilizer, heading fertilizer, and anti-flower degeneration fertilizer is 3:3:2:

2.

6. The application according to claim 4, characterized in that, When the fertilization target is single-season rice, the total amount of nitrogen fertilizer applied is 36-43 kg per mu; When the fertilization target is double-cropping rice, the amount of nitrogen fertilizer applied to each season of rice should be 65% to 70% of the amount applied to single-cropping rice.

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