Fate of fertilizer nitrogen and residual nitrogen in paddy soil in Northeast China  

作　　者：BI Shi-ting LUO Xiang-yu ZHANG Chen LI Peng-fei YU Cai-lian LIU Zhi-lei PENG Xian-long 

机构地区：[1]College of Agricultural Resources and Environmental Sciences,Northeast Agricultural University,Harbin 150030,P.R.China [2]Key Laboratory of Germplasm Enhancement,Physiology and Ecology of Food Crops in Cold Region of Ministry of Education,Northeast Agricultural University,Harbin 150030,P.R.China [3]The School of Material Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150080,P.R.China

出　　处：《Journal of Integrative Agriculture》2023年第11期3535-3548,共14页农业科学学报（英文版）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA28100302);the earmarked fund for China Agriculture Research System (CARS-01-29);the National Key Research and Development Program of China(2017YFD0200104);the Fifth (2019) of ‘Young Talents’ Project of Northeast Agricultural University,China;the Open Program of Key Laboratory of Germplasm Enhancement,Physiology and Ecology of Food Crops in Cold Region,Ministry of Education,Northeast Agricultural University (CXSTOP2021009)。

摘　　要：The relationship between the fate of nitrogen (N) fertilizer and the N application rate in paddy fields in Northeast China is unclear,as is the fate of residual N.To clarify these issues,paddy field and15N microplot experiments were carried out in 2017 and 2018,with N applications at five levels:0,75,105,135 and 165 kg N ha–1(N0,N75,N105,N135 and N165,respectively).15N-labeled urea was applied to the microplots in 2017,and the same amount of unlabeled urea was applied in 2018.Ammonia (NH3) volatilization,leaching,surface runoff,rice yield,the N contents and15N abundances of both plants and soil were analyzed.The results indicated a linear platform model for rice yield and the application rate of N fertilizer,and the optimal rate was 135 kg N ha–1.N uptake increased with an increasing N rate,and the recovery efficiency of applied N (REN) values of the difference subtraction method were 45.23 and 56.98%on average in 2017and 2018,respectively.The RENwas the highest at the N rate of 135 kg ha–1in 2017 and it was insignificantly affected by the N application rate in 2018,while the agronomic efficiency of applied N (AEN) and physiological efficiency of applied N (PEN) decreased significantly when excessive N was applied.N loss through NH3volatilization,leaching and surface runoff was low in the paddy fields in Northeast China.NH3volatilization accounted for 0.81 and 2.99%of the total N application in 2017 and 2018,respectively.On average,the leaching and surface runoff rates were 4.45% and less than 1.05%,respectively,but the apparent denitrification loss was approximately 42.63%.The residual N fertilizer in the soil layer (0–40 cm) was 18.37–31.81 kg N ha–1in 2017,and the residual rate was 19.28–24.50%.Residual15N from fertilizer in the soil increased significantly with increasing N fertilizer,which was mainly concentrated in the 0–10 cm soil layer,accounting for 58.45–83.54% of the total residual N,and decreased with increasing depth.While the ratio of residual N in the 0–10 cm soil layer to that

关 键 词：fate of N fertilizer NH_(3) volatilization leaching surface runoff residual nitrogen yield 

分 类 号：S511[农业科学—作物学] S158