Effects Of Nitrification Inhibitor2,5-DCNB On Soil Nitrogen Transformation And Leaching Loss

Loss of farmland nitrogen caused water pollution of the environment, is currently one ofthe important ecological environment problems needed to resolve. Soil microorganisms havea considerable impact on soil nitrogen transformation, Use of nitrifieation inhibitor controlsoil nitrogen transformation, thus reduce soil nitrogen loss, to reduce water pollution of theenvironment has very important significance. As a extracted from solid waste benzenechloride tar chemical by products of2,5-dichloro nitrobenzene （2,5-DCNB）, its productionhas quite high, and to explore new reasonable use way.2,5-DCNB as nitrifieation inhibitor,in domestic has in the field of agronomy verified its nitrogen-fixing fattening effect, but littlerelated research in the field of the environment.At home and abroad, this study was to summarize the governance of water pollution ofnon-point source nitrogen application, based on the screening of nitrifieation inhibitor2,5-DCNB have nitrogen fixation of protecting fertilizer effect, inhibition of nitrifying bacteriaand denitrifying bacteria in the soil, and the urease inhibitory effect to a certain extent,improve the utilization rate of nitrogen fertilize. Therefore this study used nitrifieationinhibitor2,5-DCNB, carry out its influence on soil nitrogen loss and the water environmentof ecology, in order to control water environment pollution and provides the theory basis forthe development and application of2,5-DCNB.This test takes a greater difference between two kinds of physical and chemicalproperties of soil in our country, the research of urea under the condition of adding differentconcentration of2,5-DCNB in30days incubation period characteristics of the dynamicchange of nitrogen in the soil, in order to determine the nitrification inhibition performance of2,5-DCNB and optimum concentration of additives. Experimental results show that wushansoil and chao soil add2,5-DCNB has a significant inhibitory effec to release of NH₄⁺-N andnitration process. Different concentrations of2,5-DCNB significant difference betweentreatment, In aerobic condition, each processing, the best inhibition effect in6²1days. Theregular urea added with8%of2,5-DCNB still has good inhibition in21days, wushan soiland FengQiu soil NO3--N concentration in the soil was reduced by20%and16%respectively.The regular urea added with8%of2,5-DCNB is better also. Adding different concentrationof2,5–DCNB; In anaerobic condition, the NH₄⁺-N concentration higher than in aerobiccondition, and for a long time at high concentration; Different concentrations of2,5-DCNBprocessing of nitrification inhibition rate increased with the increase of adding amount, theinhibition effect increases. In considering the price, in practice, The regular urea added with5%of2,5-DCNB can be used as the best dosage. The test using9kinds of different physical and chemical properties of soil samplesnationwide,respectively with aerobic and anaerobic condition, studiesthe the dynamic changeof nitrogen in the soil within21days of experimen, To verify nitrifieation inhibitor2,5-DCNB in different regions under different conditions of soil physical and chemical properties,whether nitrification inhibition performance is good.The test results show that2,5-DCNBnitrification inhibition performance has selectivity to the soil type, because of the differentsoil conditions, moisture condition is different, Across the country in different parts, the2,5-DCNB under different soil types, the degree of inhibition of soil ammonium nitrate also isdifferent; within21days of experimen QiChun soil and wangcheng red yellow soil sampleunder the effect of2,5–DCNB,the inhibition of ammonium nitrate is not good; In aerobiccondition,added2,5-DCNB to laiyang soil and wuhu soil,the nitrification inhibition ratearebest, can amount to50.37%and43.49%respectively, can effectively reduce the concentrationof the nitrate nitrogen in the soil, so as to reduce nitrate by surface runoff and leaching lossesand pollution of surface water and groundwater, to reduce the water pollution of theenvironment. provides the basis for popularization and application in different parts of thefield test.Farmland nitrogen phosphorus migration to the water body is one of the main causes ofgroundwater pollution,and leaching is one of the basic approach of soil nitrogen loss, andNitrate nitrogen is the main form of into the groundwater.Therefore, to control or delay theconversion of nitrogen to ammonium nitrate,will to help reduce soil nitrogen migration to thewater body. With chao soil and wushan soil as material planting pakchoi, Soil nitrogenleaching experiment was carried out under Urea and2,5-DCNB into the soil, to observe thedynamic change of nitrogen leaching. Results show that within40days for four artificialsimulated rainfall eluviation, compared with the regular urea,use2,5-DCNB, significantlyreduce the soil nitrogen leaching, groundwater nitrate concentrations close to no fertilizertreatment.;Ammonium leaching of nitrogen in the soil increased in early, but because of thestrong adsorption characteristics of ammonium nitrogen, soil total migration is very low,won’t cause pollution to groundwater; Can reduce about60%of the inorganic nitrogen intothe underground water, at the same time significantly slow the rate of soil acidification,effectively reduce nitrogen leaching in vegetable soils and reduce water pollution of theenvironment.