How can urea-N one-time management achieve high yield and high NUE for rainfed and irrigated maize?
文献类型: 外文期刊
作者: Jiang, Chaoqiang 1 ; Lu, Dianjun 1 ; Chen, Xiaoqin 1 ; Wang, Huoyan 1 ; Zu, Chaolong 2 ; Zhou, Jianmin 1 ;
作者机构: 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
2.Anhui Acad Agr Sci, Tobacco Res Inst, Maize Res Ctr, Hefei 230031, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词: Maize type; Local N supply; Nutrient management; N-15 fate
期刊名称:NUTRIENT CYCLING IN AGROECOSYSTEMS ( 影响因子:3.866; 五年影响因子:4.504 )
ISSN: 1385-1314
年卷期: 2022 年 122 卷 3 期
页码:
收录情况: SCI
摘要: Split nitrogen (N) management is a primary strategy for reducing N loss using the conventional broadcasting method in high-yield maize systems, while increasing labour costs with the progression of labour transfer. This study examined whether localized, one-time urea-N fertilization can achieve high yield for rainfed and irrigated maize in the Huang-Huai-Hai Plain, China. We first identified the critical N placement depth (120 mm) that ensures a high yield and N uptake for the two types of maize in a field experiment. A 2-year field experiment was conducted to validate the root zone one-time N management (RON) strategy based on an optimal placement with seven N levels compared with split N management (SN). With urea point placement, the N movement distance (about 70 mm) was highly limited by the fertilizer placement. The RON consistently maintained a higher soil-available N content than the SN, which stimulated root proliferation and enlarged root surface area, especially for rainfed maize. Hence, the RON, based on placement regulation, increased the yield plateau by 8% while reducing the optimal N rate by 22% for rainfed maize compared with the SN and archived a similar yield plateau while decreasing the optimal N rate by 25% for irrigated maize. Compared with SN, the apparent recovery efficiency of N under the RON treatment increased from 41 to 48%, and from 43 to 54% for irrigated and rainfed maize, respectively. In conclusion, one-time urea-N fertilization based on placement regulation could be an efficient nutrient management strategy for intensive maize systems.
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