首页|Optimization of inter-seasonal nitrogen allocation increases yield and resource-use efficiency in a water-limited wheat-maize cropping system in the North China Plain
Optimization of inter-seasonal nitrogen allocation increases yield and resource-use efficiency in a water-limited wheat-maize cropping system in the North China Plain
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Winter wheat-summer maize cropping system in the North China Plain often experiences drought-induced yield reduction in the wheat season and rainwater and nitrogen(N)fertilizer losses in the maize season.This study aimed to identify an optimal interseasonal water-and N-management strategy to alle-viate these losses.Four ratios of allocation of 360 kg N ha-1 between the wheat and maize seasons under one-time presowing root-zone irrigation(W0)and additional jointing and anthesis irrigation(W2)in wheat and one irrigation after maize sowing were set as follows:N1(120∶240),N2(180∶180),N3(240∶120)and N4(300∶60).The results showed that under W0,the N3 treatment produced the highest annual yield,crop water productivity(WPC),and nitrogen partial factor productivity(PFPN).Increased N allocation in wheat under W0 improved wheat yield without affecting maize yield,as surplus nitrate after wheat harvest was retained in the topsoil layers and available for the subsequent maize.Under W2,annual yield was largest in the N2 treatment.The risk of nitrate leaching increased in W2 when N appli-cation rate in wheat exceeded that of the N2 treatment,especially in the wet year.Compared to W2N2,the W0N3 maintained 95.2％grain yield over two years.The WPC was higher in the W0 treatment than in the W2 treatment.Therefore,following limited total N rate,an appropriate fertilizer N transfer from maize to wheat season had the potential of a"triple win"for high annual yield,WPC and PFPN in a water-limited wheat-maize cropping system.
Cropping systemWater-saving irrigationNorth China PlainNitrogen optimizationSustainable intensification
College of Agronomy and Biotechnology,China Agricultural University,Beijing 100193,China
College of Information and Electrical Engineering,China Agricultural University,Beijing 100193,China
Ministerial and Provincial Co-Innovation Centre for Endemic Crops Production with High-Quality and Efficiency in Loess Plateau,Taigu 030801,Shanxi,China
Hebei Province Key Research ProjectBeijing Science and Technology Planning ProjectChina Postdoctoral Science FoundationChina Agriculture Research System
NETL
NSTL
万方数据
