植物营养与肥料学报2024，Vol.30Issue(6)：1092-1102,11.DOI:10.11674/zwyf.2024048
添加脲酶/硝化抑制剂条件下基于15N示踪的夏玉米当季肥料氮去向研究
Study on the fate of fertilizer nitrogen during summer maize season based on high abundance of 15N under application of urease/nitrification inhibitors
摘要
Abstract
[Objectives]The purpose of this paper was to investigate the fate of fertilizer nitrogen under the application of urease/nitrification inhibitors in summer maize in North China Plain by using high abundance 15 N isotope tracer method.[Methods]The summer maize field experiment was conducted from June 25 to October 9 of 2022 in Langfang,Hebei Province.The experiment contained five treatments:no nitrogen fertilizer control(CK),merely urea application(U),combined application of urea with urease inhibitor(UI),nitrification inhibitor(NI),and both of urease and nitrification inhibitor(UI+NI).The cumulative NH3 volatilization and N2O emission were monitored to calculate the gaseous loss of fertilizer nitrogen.The N uptake by plant,soil fertilizer N residues were investigated at harvest.[Results]Compared with merely urea treatment,UI,NI and UI+NI treatment increased the N absorption in the above ground of maize by 39.7%,33.1%and 41.8%,thus significantly increased the N recovery rate by 12.5,6.8 and 12.3 percentage points,respectively,and the enhancement effect of UI and UI+NI were higher than that of NI.Compared with U,UI and UI+NI increased soil N residue by 35.6%and 45.7%.NI did not reduce the NH3 volatilization obviously,while UI and UI+NI significantly decreased that by 14.3%and 11.6%,respectively.All the UI,NI and UI+NI treatments reduced cumulative N2O emission significantly,with the reduction rate of 17.2%,19.9%,and 34.5%,respectively,and UI+NI treatment was recorded significantly higher reduction rate than UI and NI by 20.9%and 18.2%,respectively.[Conclusions]In the typical fluvo-aquic soil of North China Plain,combining application of urea with urease/nitrification inhibitors on summer maize could significantly increase the nitrogen absorption of summer maize.Urease inhibitor significantly increases fertilizer nitrogen residues in soil,reduces NH3 volatilization and cumulative N2O emission,while nitrification inhibitor mainly reduces the cumulative N2O emission.The combined application of urease and nitrification inhibitors shows significantly better effect than the respective application in increasing N uptake,reducing gaseous loss of nitrogen fertilizer and improving the nitrogen fertilizer utilization rate,so is recommended for the maize fertilization in the test area.关键词
夏玉米/高丰度15N尿素/脲酶抑制剂/硝化抑制剂/氮肥当季吸收量/土壤残留率/气态损失/肥料氮当季损失率Key words
summer maize/high abundance of 15N/urease inhibitor/nitrification inhibitor/fertilizer nitrogen uptake in season/soil residue rate/gaseous loss/fertilizer nitrogen loss rate in season引用本文复制引用
辛苏宁,王磊,卢艳丽,白由路,王玉红,江晗,王洛斌..添加脲酶/硝化抑制剂条件下基于15N示踪的夏玉米当季肥料氮去向研究[J].植物营养与肥料学报,2024,30(6):1092-1102,11.基金项目
国家重点研发项目(2021YFD1700900). （2021YFD1700900）
