Fate of labeled urea-N-15 as basal and topdressing applications in an irrigated wheat-maize rotation system in North China plain: II summer maize
文献类型: 外文期刊
第一作者: Yang, Yunma
作者: Yang, Yunma;Wang, Xiaobin;Dai, Kuai;Zhao, Quansheng;Zhang, Xiaoming;Zhang, Dingchen;Feng, Zonghui;Wu, Xueping;Cai, Dianxiong;Yang, Yunma;Wang, Xiaobin;Dai, Kuai;Zhao, Quansheng;Zhang, Xiaoming;Zhang, Dingchen;Feng, Zonghui;Wu, Xueping;Cai, Dianxiong;Yang, Yunma;Jia, Shulong;Meng, Chunxiang;Sun, Yanming;Grant, Cynthia
作者机构:
关键词: Maize;15N recovery;Urea;Nitrogen recovery efficiency;North China Plain
期刊名称:NUTRIENT CYCLING IN AGROECOSYSTEMS ( 影响因子:3.27; 五年影响因子:3.767 )
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年卷期:
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收录情况: SCI
摘要: A field micro-plot experiment for summer maize was conducted in an irrigated winter wheat (Triticum aestivum)-summer maize (Zea mays L.) rotation system in Mazhuang, Xinji of Hebei province in the North China Plain, using the N-15 isotope method to determine the effects of N application (rates and timing) on urea-N-15 fate, residual N effects and N recovery efficiency (NRE) by maize. The experiment included three N rates (90, 180, and 270 kg ha(-1)), divided by two N-15-labeled groups of basal-N-15 (30, 60, and 90 kg ha(-1), respectively) and topdress-N-15 (60, 120, and 180 kg N ha(-1), respectively). All of the treatments were irrigated two times, once at seeding time and once at topdressing time. The absorbed N in the maize plant derived from basal-N (6.8-13%) and topdress-N (17-30%) was identified. The residual N in the 0-150-cm soil depth ranged from 45 to 60% at the first maize harvest, mainly retained in the top 20-cm layers. Both NRE in grain and total N recovery in plant in the first maize crop were higher from topdress-N-15 (26-31 or 41-51%, respectively) than from basal-N-15 (18-23 or 34-43%, respectively). The residual N in the 0-150-cm soil layer was lower from topdress-N-15 (45-47%) than from basal-N-15 (55-60%) after the first maize harvest. Residual N recovery was 6-11% in the second and 1.5-3.5% in the third crop. Cumulative N recovery in the maize-wheat-maize rotations was higher from the topdress-N-15 (49-59%) than from basal-N-15 and (45-55%). The unaccounted N loss was 14-24% from the basal-N-15 and 20-33% from the topdress-N-15, with a double dose of basal-N-15 application. An N rate of approximately 180 kg ha(-1) appears to be an effective application rate to optimum maize yield and NRE on North China Plain, depending on the residual N and the crop yield potential.
分类号: TQ44
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