CN102140051A - Application of 3, 4-dimethyl pyrazole phosphate urea and usage method thereof - Google Patents
Application of 3, 4-dimethyl pyrazole phosphate urea and usage method thereof Download PDFInfo
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- CN102140051A CN102140051A CN2010105691489A CN201010569148A CN102140051A CN 102140051 A CN102140051 A CN 102140051A CN 2010105691489 A CN2010105691489 A CN 2010105691489A CN 201010569148 A CN201010569148 A CN 201010569148A CN 102140051 A CN102140051 A CN 102140051A
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- dimethyl pyrazole
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- Y—GENERAL 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
Abstract
The invention discloses an application of 3, 4-dimethyl pyrazole phosphate urea and a usage method thereof. The 3, 4-dimethyl pyrazole phosphate urea can be simultaneously used for controlling loss of nitrogen in the form of the urea through runoff, side seepage and gas state; the usage method comprises the following steps: the 3, 4-dimethyl pyrazole phosphate urea is applied so as to inhibit the transformation of nitrogen in the urea from NH4<+> to NO2<-> and NO3<-> at the level layer of agricultural non-point source pollution source control, increases the content of easy absorbing state NH4<+> of plants in soil, reduces the contents of easy loss state NO2<-> and NO3<->, inhibits denitrification and ammonia gas volatilization, improves fertility of soil, reduces nitrogen loss, lowers water body eutrophication and risks of underground water nitrate pollution.
Description
Technical field
The present invention relates to pollution of area source control environmental protection field, relate in particular to a kind of 3, the purposes and the using method thereof of 4-dimethyl pyrazole phosphoric acid salt (DMPP) urea.
Background technology
A large amount of losses of agricultural land soil nitrogen cause surface water and phreatic pollution serious day by day.
Current, cause the body eutrophication aggravation, the agricultural area source environmental pollution of alga eruption has become a serious global problem.In various agriculture production activities, people use chemical fertilizer unreasonably in a large number for the output of pursuing crop, and according to investigations, it is 200kg/ha that pure nitrogen level is executed in China's annual at present.In the developed area such as execute pure nitrogen level Taihu Lake basin year and reach more than the 600kg/ha, in many regional purity nitrogen usage quantitys even up to 500-1300kg/ha, very easily run off behind the nitrogen application, rural activity scope in addition is huge, and the pollution of area source of generation is much bigger more than industrial point-source pollution influence.Have investigation to show that the total nitrogen turnover rate in farmland, basin accounts for 20% of whole nitrogenous fertilizer usage quantitys, wherein, the restricted factor phosphorus of body eutrophication 87%, nitrogen 70% all derive from widespread pollution from the overuse of fertilizers and pesticides in rural area.
Simultaneously, the seepage of nitrate can cause groundwater pollution in the widespread pollution from the overuse of fertilizers and pesticides in rural area, and tap water and Nitrate Content in Food content roll up, thereby causes the infant to suffer from V in methemoglobinemia, respiratory system disease, the liver
aContent decline disease or the like.According to the underground water sample survey result demonstration of the Chinese Academy of Agricultural Sciences to provinces and cities such as Beijing, Tianjin, Shandong, 45% water sample has surpassed WHO standard (11.3mg/L-N).The exceeding standard rate of nitric nitrogen also reaches 38% in China's TAI HU AREA tap water.The Groundwater Nitrate-nitrogen content in suburb of Beijing district is more up to 61.6-120.4mg L
-1
How to reduce the migration of nitrogen in water body and become one of focus of water environment protection field people concern.The critical impact factor that microorganism transforms as soil nitrogen migration relies on effects such as microorganism ammonia oxidation, and ammonium nitrogen is converted into the nitric nitrogen that very easily runs off, with face of land runoff and leaching and polluted-water.By utilizing new nitrification DMPP to suppress the nitrification function microbic activity; can control or delay the conversion of ammonia nitrogen to nitric nitrogen; help to reduce the migration of soil nitrogen, run off, effective way of the protection water surrounding of can yet be regarded as and method thereby reduce soil nitrogen to water body.And the present stage scholar is very few to the research of nitrification inhibitor DMPP in water body environment protection field.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of 3, the purposes and the using method thereof of 4-dimethyl pyrazole phosphoric acid salt urea.
The objective of the invention is to be achieved through the following technical solutions:
A kind of 3, the purposes of 4-dimethyl pyrazole phosphoric acid salt urea is used for suppressing simultaneously nitrogen and transforms by rainwash, seepage, gaseous state and run off.
A kind of 3, the using method of 4-dimethyl pyrazole phosphoric acid salt urea is characterized in that: add 3 during nitrogen fertilizer application in urea, 4-dimethyl pyrazole phosphoric acid salt gets 3,4-dimethyl pyrazole phosphoric acid salt urea, 3, the mass ratio of 4-dimethyl pyrazole phosphoric acid salt and urea is 1～2: 98～99.3,4-dimethyl pyrazole phosphoric acid salt urea amount of application is for amounting to 3,4-dimethyl pyrazole phosphoric acid salt 0.5～1.5kg/hm
2, divide and use for 2-3 time, can be used as base manure or topdress and use
Further, using 3, during 4-dimethyl pyrazole phosphoric acid salt urea, can mix high C/N and join after than organism such as stalk and execute, stalk is long to 1～2cm with the machinery chopping, and the quality of stalk is 3,5～10% of 4-dimethyl pyrazole phosphoric acid salt urea quality,
Further, the disappearance of rice terrace face water need be poured water after 2-5 days, specifically regarded thing classification and crop growth period as and decided, and executing farmland, the back subsoil drain depth of burying is 20～30cm, fertilising suitable＞40-50 days at interval.
The invention has the beneficial effects as follows, on source control aspect, suppress the microorganism nitrification activity, suppress or slow down and use in the chemical fertilizer nitrogen by NH
4 +To NO
2 -And NO
3 -Conversion process, increase NH in the soil
4 +Content (plant absorbing principal mode) reduces NO
2 -, NO
3 -(easily running off) content and reduction NO
2 -, NO
3 -With N
2O and N
2Form (denitrification) loss amount, reduce nitrogen in the loss aspect oozing of runoff and side, promote soil fertility, improve grain yield, reduce nitrogen loss, thereby reduce the risk of rivers and lakes body eutrophication and groundwater azotate pollution, for the widespread pollution from the overuse of fertilizers and pesticides in rural area comprehensive improvement provides the technological method support.In addition, the present invention also have novel, efficient, consumption is little, transport property is little, be difficult for leaching loss, restraining effect longer duration, the minimum advantage of residual quantity.
Description of drawings
Fig. 1 adds the dynamic effects figure of the urea of DMPP in soil ammonium-state;
Fig. 2 is the dynamic effects figure that adds urea nitric nitrogen in soil of DMPP;
Fig. 3 is the dynamic effects figure that adds urea nitrite nitrogen in soil of DMPP;
Among Fig. 4, when (a) executing DMPP urea for the first time, ammonium nitrogen content Dynamic Variation Analysis figure in the table water of field, when (b) executing DMPP urea for the second time, ammonium nitrogen content Dynamic Variation Analysis figure in the table water of field;
Among Fig. 5, when (a) executing DMPP urea for the first time, nitrate nitrogen content Dynamic Variation Analysis figure in the table water of field, when (b) executing DMPP urea for the second time, nitrate nitrogen content Dynamic Variation Analysis figure in the table water of field;
Among Fig. 6, when (a) executing DMPP urea for the first time, field table water Central Asia nitrate nitrogen content Dynamic Variation Analysis figure, when (b) executing DMPP urea for the second time, field table water Central Asia nitrate nitrogen content Dynamic Variation Analysis figure;
Fig. 7 be add DMPP urea under the different soils moisture content to the figure that influences of ammonia volatilization;
Fig. 8 is that the urea that adds DMPP influences figure to ammonia volatilization when adding different C/N than the organism condition.
Embodiment
The present invention adopts 3, and (3,4-dimethyl pyrazole phosphate DMPP), promptly utilizes biochemical amendment DMPP to suppress microbic activity to 4-dimethyl pyrazole phosphoric acid salt, stops or alleviate the NH of difficult loss
4 +Be oxidized to the NO of easy loss
2 -And NO
3 -, reduce the risk of nitrogen to the water body migration.
Nitrogenous fertilizer (ammonia or the ammonium salt) back that is manured into soil exists in control environment condition and microorganism and issues caliche and turn usefulness into, and this process is made up of two steps: the first step is NH
4 +Be oxidized to NO
2 -, NH
2OH is an intermediate product, N
2O can be by generation.The bacterium that participates in this step is called the ammonium oxidizing bacteria, and second step was NO
2 -Be oxidized to NO
3 -The first step is a rate-limiting reaction, and DMPP can produce toxic action to the ammonium oxidizing bacteria, thereby suppresses whole nitration reaction process.
Plant is mainly with NH
4 +Form absorb nitrogen, the DMPP adding technique is applied to nitrogen loss source measure of control, join the form of executing with nitrification inhibitor and chemical fertilizer and use, the nitrogen in the soil can be for a long time with NH
4 +Form remain in the soil, Another reason is exactly that soil is to NH
4 +Adsorption strength be better than NO
3 -, NH
4 +To NO
3 -Inversion quantity decrease, this not only helps to promote the soil fertilizer efficiency, increases the absorbed dose of plant to nitrogen, simplifies measures of fertilizer, reduces fertilizer application frequency, promotes grain-production, also reduces the NO in the soil simultaneously
3 -Content reduces NO
3 -Number of dropouts, thereby reduce nitrogen load in the receiving water body, reduce the risk that rivers and lakes body eutrophication and groundwater pollution phenomenon take place.
NO
3 -And NO
2 -Electronegative, NH
4 +Positively charged, so the soil belt negative charge is NO
2 -And NO
3 -Easier loss, DMPP and chemical fertilizer join execute after, can avoid higher concentration NO
2 -And NO
3 -Occur, thereby nitrogen is with NO in the reduction soil
2 -And NO
3 -Form run off through leaching.Simultaneously, NO
2 -And NO
3 -The reduction of total amount also greatly reduces the generation (NO of nitrogen denitrification
3 -→ NO
2 -→ NO → N
2O → N
2), reduce nitrogenous fertilizer with N
2O and N
2Form loss, reach and reduce NO
2 -And NO
3 -Leaching loss and reduce N
2The purpose that O discharges.
This product by the test of comprehensive toxicology and ecotoxicology, is proved to be nontoxic to soil and crop in Germany, can not produce the hormone effect of harm plant, the correlation parameter of nitrification inhibitor DMPP as follows:
The physicochemical property of table 1-2DMPP
Embodiment 1: adding DMPP influences the urea nitrogen transformation
Adopt little silt, under the environment of soil moisture content 25%, carried out air culture and supported test, design following processing, be respectively: the urea (CK) of (1) soil+0mg N/kg; (2) urea (UREA) of soil+150mg N/kg; (3) the DMPP urea (DMPP) of soil+150mg N/kg is respectively established 3 repetitions.
Select the beaker of 250ml for use, take by weighing soil 200g, add required DMPP urea by Fertilization Level, thorough mixing is even, adds water and regulates soil moisture content, and the top covers the Parafilm film and seals, and pricks several apertures simultaneously, puts into 25 ℃ constant incubator and cultivates.Add evaporable moisture with weighting method in the culturing process.Cultivate the back 2,4,7,14,21,28,35,42,56,70,84 and 98 days, and gathered soil 12g, add the CaCl of 50ml 0.01mol/L
2Solution vibrated 1 hour, filtered and extracted, and measured ammonium nitrogen, nitric nitrogen and nitrite nitrogen in the filtrate with the flux analysis instrument.
Fig. 1 shows that common urea was at 0～7 day, and the content of ammonium nitrogen sharply is reduced to the close level of not applying fertilizer, and illustrates that hydrolysis comparatively fast takes place urea, and has finished the Biochemical processes of nitration reaction.After adding DMPP, the content of soil ammonium has obtained significant raising, in 70 days, the concentration of its ammonium nitrogen is higher than urea and non-fertilizer treatment, show that the DMPP inhibitor can effectively hinder the microbial transformation process of ammonia, thereby soil ammonium content is kept for a long time, reduced the risk that runs off.
Fig. 2 shows that the most of soils colloid is electronegative, can not adsorb nitric nitrogen, and nitric nitrogen is the main form of farmland nitrogen leaching loss and loss.Common urea peaks at 7 days left and right sides nitrate nitrogen contents, shows to finish the ammonium oxidation reaction process substantially, and adds DMPP urea, and in the time of 0～56 day, the content of its nitric nitrogen is lower than the control treatment of not applying fertilizer, and handles no significant difference with common urea subsequently.The result shows, adds the content that DMPP can effectively reduce the nitric nitrogen same period, postpones the appearance on nitric nitrogen peak, runs off and denitrification loss because of nitric nitrogen accumulates the leaching loss, the runoff that produce after fertilizer nitrogen enters soil thereby reduce.
Fig. 3 shows, use urea after, just can be observed the release peak of nitrite nitrogen at the 4th day, be reduced to and contrasted by the 14th day do not apply fertilizer close.After adding inhibitor DMPP, the content of its nitrite nitrogen is lower than and contrasts not fertilizer treatment, and the content in soil keeps extremely low trend.Experimental result shows that nitrite nitrogen content in soil is extremely low, is not the main form that soil nitrogen exists, and uses the content that DMPP can significantly reduce nitrite nitrogen.Simultaneously show that also DMPP is that first step is suppressed to the mechanism of action of nitration reaction.
Embodiment 2:DMPP is to the influence of waterflooding paddy soils water termination nitrogen form migration
For the livid purple mud (sampling depth is 30cm) in examination soil selection Jiaxing, rice varieties is early rice (transplants mid-April, the early July harvesting).
With soil sample natural air drying, crushing, reject root system, sieve with scalping, mix.Quantitatively take by weighing 7.5kg soil then at every turn and move in the pottery pot, add the 5L deionized water more respectively, make a kind of state of Soil conservation in the waterflooding soaked field.After one week, topsoil water is discharged, the form of fertilizer with base manure evenly is manured into soil, the transplanting rice seedling is 10 then.After 5 weeks, carry out secondary topdressing at rice transplanting.The fertilization of rice of two kinds of soil adopts following processing: (1) contrast (CK), not nitrogen fertilizer application; (2) Urea (base topdresses half and half); (3) Urea+DMPP (base topdresses half and half), each is handled and repeats 3 times, and nitrogen fertilizer amount is pure nitrogen 180kgha
-1Test keeps paddy rice waterflooding 3cm, no longer adds water after 10 weeks, and it is dried to allow it fall naturally, up to the paddy rice fully matured.In growth process of riceplant, gather field table water, native water termination zone of oxidation soil at set intervals.After water sample filters, measure ammonium nitrogen, nitric nitrogen and nitrite nitrogen, measure water sample pH, specific conductivity simultaneously with the flux analysis instrument.After soil natural is air-dry, use 2molL
-1Repone K extract, the flux analysis instrument is measured ammonium nitrogen, nitric nitrogen and nitrite nitrogen.
Fig. 4 shows: the content of fertilizer treatment water ammonium nitrogen is extremely not low, maintains 1mgL
-1About level, the content of fertilizer treatment ammonium nitrogen has remarkable increase.In livid purple earth earth, the content of ammonium nitrogen shows as after fertilising and improves rapidly in the water, reaches highest level to the 7th day, and mild downtrending takes place afterwards.The concentration of conventional urea processing field table water ammonium nitrogen is 16.59mgL at the 7th day peak value
-1, after 35 days, drop to 2.54mgL
-1, the variation that DMPP handles ammonium nitrogen concentration then is from 19.44mgL
-1Reduce to 3.69mgL
-1, show the form transformation of using nitrification inhibitor can suppress the water ammonium nitrogen, along with the prolongation of time, the intensifying trend that ammonium nitrogen transforms.After topdressing, in the field table water content of ammonium nitrogen with apply fertilizer for the first time similarly, reached maximum, sharply decline afterwards on the 7th day.After 21 days, conventional urea is close with the content of the processing field table water ammonium nitrogen that adds DMPP, remains on less than 4mgL to 35 days afterwards
-1Level.Compare with fertilising for the first time, the content of ammonium nitrogen is lower in the field table water that topdresses, and downward trend is also very fast.
Fig. 5 shows: the concentration that conventional urea is handled field table water nitric nitrogen sharply increased in the early stage, from the 3rd day 2.73mgL
-1Increase to the 14th day 8.45mgL
-1, the concentration of nitric nitrogen reduces gradually afterwards, drops to 3.82mgL after 35 days
-1And the concentration of DMPP processing nitric nitrogen maintained 1.36mgL all the time in 35 days
-1-2.09mgL
-1The lower concentration level, the concentration that DMPP handles nitric nitrogen significantly is lower than conventional urea to be handled, and shows the formation of using nitrification inhibitor can suppress the water nitric nitrogen.After topdressing, in the table water of two kinds of soil fields the content of nitric nitrogen with apply fertilizer the first time similarly, reached maximum, and descended afterwards in the 14th day.As time goes on, nitrification becomes strongly, is far longer than denitrification, causes the content of nitric nitrogen constantly to increase; Subsequently, though nitrification is still taking place,, cause the required substrate ammonium nitrogen consumption of nitration reaction, so the content of nitric nitrogen descends thereupon because paddy rice constantly descends its content to the absorption of ammonium nitrogen.
Fig. 6 shows: for the first time after the fertilising, along with the carrying out of nitrification, the content of intermediate product nitrite nitrogen increases sharply, and reaches maximum to 14 days its concentration, is respectively 2.70mgL
-1With 2.53mgL
-1, reduce to 0.36mgL after 35 days
-1With 0.09mgL
-1, approaching with contrast.And DMPP handles the urea group, and the content of its nitrite nitrogen is respectively at 0.02-0.28mgL in 35 days
-1With 0.01-0.23mgL
-1Scope, show that DMPP significantly reduces the content of nitrite nitrogen, and show that also DMPP mainly suppresses first step of nitration reaction as nitrification inhibitor.After topdressing, in the field table water content of nitrite nitrogen with apply fertilizer the first time similarly, conventional urea is handled and was reached maximum 2.55mgL on the 7th day respectively
-1With 2.44mgL
-1, 0.07mgL takes place comparatively fast to drop to afterwards
-1With 0.04mgL
-1, and the urea that DMPP handles, the content of its nitrite nitrogen is respectively at 0.01-0.28mgL in 35 days
-1With 0.02-0.34mgL
-1Scope.After topdressing, nitrite nitrogen content descends very fast, and this may be because the late growth stage of rice well developed root system, and the physiology of rice root secretes that the oxygen function is stronger, and oxygen in water content increases, and has accelerated the process of nitration reaction; Paddy growth has consumed the required substrate ammonium nitrogen of nitration reaction to a large amount of absorptions of nitrogen in addition, makes the form of nitrite nitrogen in the table water of field finish conversion process.
Embodiment 3:DMPP urea is used the influence of back to three kinds of form nitrogens vertical distribution in soil
Test is arranged in greenhouse, this school, and temperature is at 25～30 ℃.Gather 0～20cm, 20～40cm, the section soil of 40～60cm, after the air-dry 2mm of mistake sieves, simulation original-state soil layering dress post.5 processing are established in test, and each is handled and repeats specific design: do not apply fertilizer conventional urea (400kg/hm 3 times
2), DMPP urea (200kg/hm
2), DMPP urea (400kg/hm
2), DMPP urea (600kg/hm
2).Get the table soil about 5cm, will return in the earth pillar behind fertilizer and the soil uniform mixing.Drip distilled water every day by steam output and rainfall amount later on.At the 10th, 60 day, the water sample with in the negative pressure of vacuum absorption different depths teflon plastics tubing filtered the back and measures ammonium nitrogen, nitric nitrogen and nitrite nitrogen with the flux analysis instrument.As can be seen from Figure 6, can significantly improve the above topsoil gong water of 20cm NH after DMPP uses
4 +Concentration, reduce NO
2 -And NO
3 -Concentration, the following deep subsoil water NH of 20cm simultaneously
4 +Change in concentration not obvious, NO
3 -Concentration significantly reduce, the farmland subsoil drain depth of burying suggestion of using this material is lower than 20cm, its effective inhibition time to the oxidation of soil ammonium is 60 days.
The influence that embodiment 4:DMPP urea runs off to the ammonia attitude under different water cut rate condition
Test design is provided with 4 moisture levels, be respectively 30% (W1), 67% (W2), 83% (W3) and 100% (W4) of field capacity, as shown in Figure 7, ammonia attitude loss size is: W4＞W2＞W3＞W1, when soil moisture content is field saturation moisture capacity (30%), the trend that the ammonia attitude runs off increased very fast, and its climax reached 1.79mg at the 14th day, and ammonia attitude loss total amount is 8.57mg in 10 weeks.Its reason may be when the saturation moisture capacity of field, hydrolysis of urea is fast, urease activity is strong, the activity of nitrification inhibitor is also high simultaneously, inhibition ability to ammonia nitrogen is stronger, effectively stops the ammonia oxidation process to take place, and ammonia-state nitrogen shared ratio in ammonia-state nitrogen and ammonium nitrogen total amount is higher in the liquid phase with this understanding, the pH in the little territory of soil raises, and the ammonia attitude runs off and strengthens.Three processing of W3, W2 and W1, trend basically identical, especially W3 and two processing of W1 that its ammonia attitude runs off do not have marked difference especially.So therefrom can learn when soil moisture content be the field saturation moisture capacity 30% and 80% the time, the loss of running off of ammonia attitude is lower, and the loss of ammonia attitude is the most serious when saturation moisture capacity.
Embodiment 5:DMPP urea and C/N use ammonia attitude loss influence than the organism mixing
Test and Selection is that 400kg/ha and moisture content are under 80% the condition of field capacity in rate of fertilizer application, add different C/N than organism: the chicken manure organic fertilizer (mature of fermentative processing, nitrogen content 2.58%, C/N=4.3), rice straw (stem, nitrogen content 0.59%, C/N=78.7) and glucose (sugar), respectively establish 3 repetitions.These materials are crossed 2mm sieve back and are manured into soil with fertilizer.Loss has remarkable influence to the ammonia attitude than organism to add different C/N, as can be seen from Figure 8, add low C/N than organism chicken manure fertilizer, the total amount that the ammonia attitude runs off in 70 days is 3.00mg, organic contrast urea is close with not adding, but the ammonia burst size of test chicken manure organic fertilizer in early stage processing is stronger.And add high C/N than organism rice straw, supply with the required carbon source of microorganism, make microorganism show as clean fixing to the nitrogen of soil, reduced ammonia nitrogen concentration in the soil, the ammonia attitude runs off and shows as reduction trend, the total amount that the ammonia attitude runs off in 70 days is 0.58mg, and does not add organic contrast urea and compares and can reduce the ammonia attitude and run off 78.2%.
Claims (4)
1. one kind 3, the purposes of 4-dimethyl pyrazole phosphoric acid salt urea is characterized in that: described 3,4-dimethyl pyrazole phosphoric acid salt urea is used for suppressing simultaneously nitrogen and transforms by rainwash, seepage and gaseous state and run off.
2. one kind 3, the using method of 4-dimethyl pyrazole phosphoric acid salt urea is characterized in that: add 3 during nitrogen fertilizer application in urea, 4-dimethyl pyrazole phosphoric acid salt gets 3,4-dimethyl pyrazole phosphoric acid salt urea, 3, the mass ratio of 4-dimethyl pyrazole phosphoric acid salt and urea is 1～2: 98～99.3,4-dimethyl pyrazole phosphoric acid salt urea amount of application is for amounting to 3,4-dimethyl pyrazole phosphoric acid salt 0.5～1.5kg/hm
2, divide and use for 2-3 time, can be used as base manure or topdress and use.
3. according to claim 2 described 3, the using method of 4-dimethyl pyrazole phosphoric acid salt urea, it is characterized in that: using 3, during 4-dimethyl pyrazole phosphoric acid salt urea, can mix high C/N joins after than organism such as stalk and executes, stalk is long to 1～2cm with the machinery chopping, and the quality of stalk is 3,5～10% of 4-dimethyl pyrazole phosphoric acid salt urea quality.
4. according to claim 2 described 3, the using method of 4-dimethyl pyrazole phosphoric acid salt urea, it is characterized in that: the disappearance of rice terrace face water need be poured water after 2-5 days, specifically regard thing classification and crop growth period as and decide, executing farmland, the back subsoil drain depth of burying is 20～30cm, fertilising suitable＞40-50 days at interval.
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| CN107805124A (en) * | 2017-11-21 | 2018-03-16 | 华中农业大学 | A kind of fertilizer additive for reducing outdoor vegetable nitrate and dynamics of soil nitrate |
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