Effects Of Nitrification Inhibitor 3,4-Dimethylpyrazole Phosphate (DMPP) On Nitrate Nitrogen Contents And N Utilization And Absorption In Peach Orchards

Nitrogen fertilizer plays a very important role in increasing crop yield and improving crop quality.Urea is widely used in agricultural production as a convenient source of nitrogen in recent years,it has no enough time for plants to take absorption of the excessive amount of nitrogen because more and more nitrogen fertilizer has been put into the soil.Under the effect of soil urease hydrolysis into ammonia,ammonia can be oxidized into ammonium nitrogen,ammonium nitrogen is converted to nitrate under the action of nitrification.Because of nitrate nitrogen is not easy to be adsorption in soil,the excessive amount of residual nitrate in soil,and then will access to the air and water during the process of leaching,run off and denitrification,which results in severe pollution of the soil,air and water.Therefore,controlling the process of transformation from ammonium to nitrate and reducing the residual nitrate in soil is the key step to improve the utilization rate of nitrogen.The purpose of this experiment as the main starting point,with annual ‘xiacui/peach' as the experimental material,through pot experiment,15 N tracer elements technology were used to study the influence of adding different amounts of DMPP and biochemical fulvic acid potassium to chemical fertilizeron mode on nitrogen utilization rate,and soil characteristic was studied.And provide theoretical support for effective fertilization of peach trees.The results showed that:1.In the experiment of potted seedlings,compound fertilizer with different amounts of DMPP and biochemical sulfuric acid potassium,the results show that the concentration of NH4+-N in DMPP and sulfuric acid treatments was higher than CK.The 75 day after treatment was compared with the 15 day after treatment.The single(CK)treatment,the concentration of NH4+-N in soil reduced 93.06%,0.5% DMPP(T1)treatment,reduced 84.65%,1% DMPP(T2)treatment,reduced 83.38% and 2% DMPP(T3)treatment,reduced 85.99%,biochemical sulfuric acid potassium fertilizer(T4)treatment,reduced 81.47%.The content change trend of nitrate nitrogen in soil had a negative correlation with the harmonium nitrogen.Compare the contention of NO3--N under different treatment.CK > DMPP treatment > T4 performance for each period,under DMPP processing,T1>T3>T2.The 75 day after treatment was compared with the 15 day after treatment.The content of NO3--N in soil was increased by 3.32 times(CK),2.65 times(T1),2.74 times(T2),2.74 times(T3),2.53(T4),and 2.46(T5)respectively under different treatment.2.The Naff values of each organ of the young trees of different fertilization treatments showed as follows: leaf > stem > root;compared with CK,the Naff values of DMPP and biochemical sulfuric acid treatment was high significantly.Young peach trees in various organs of nitrogen absorption capacity and absorption and utilization of Richie was increased under DMPP treatment;compared with the CK,the 15 N utilization rate increased by 14.79%(T1),34.15%(T2),30.57%(T3),17.43%(T4).The activity of cattail,phosphorescent,inverse and urey in soil was obvious under DMPP and biochemical sulfuric acid treatment.3.In the field,in the distance from the trunk of 50 cm uniform fertilization treatment,in the near fertilization point(away from the trunk of 50 cm)and far fertilization point(away from the trunk 100 cm)sampling analysis,the results show that: compared with single compound fertilizer(I),DMPP(II)and sulfuric acid potassium(III)treatment,the concentration of NH4+-N in DMPP and sulfuric acid treatments was higher than CK at the same time.The 75 day after treatment was compared with the 15 day after treatment,the single chemical fertilizer(I)treatment,the concentration of NH4+-N reduced 84.15%,DMPP treatment,reduced 79.78%,sulfuric acid potassium treatment,reduced 80.24% and the change of the far point was not significant.The results showed that soil nitrate nitrogen,near the point of upward trend,there is no significant difference between distant points.The results showed that DMPP and sulfuric acid could delay the transformation of harmonium to nitrate nitrogen in the soil.