Nitrogen use efficiency in a wheat-corn cropping system from 15 years of manure and fertilizer applications
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- 作者：Yinghua Duan ; Minggang Xu ; Suduan Gao ; Xueyun Yang ; Shaomin Huang ; Hongbin Liu ; Bairen Wang
- 关键词：NUE ; nitrogen use efficiency ; NUE ; nitrogen agronomic efficiency ; CK ; control ; NPKm ; chemical nitrogen ; phosphorus ; and potassium fertilizer plus manure ; 1.5NPKm ; 1.5 rate of NPKm ; NPKs ; chemical NPK with corn stover returned ; PC ; P fertilizer contribution ; KC ; K fertilizer contribution ; MC ; manure contribution
- 刊名：Field Crops Research
- 出版年：15 February, 2014
- 年：2014
- 卷：157
- 期：Complete
- 页码：47-56
- 全文大小：617 K
文摘
Low nitrogen use efficiency (NUE) and adverse environmental impacts caused by N fertilization increasingly threaten the sustainability of agriculture. To develop strategies for efficient nutrient management, we investigated the effects of long-term (1991-2005) various fertilization regimes on yield, NUE and N agronomic efficiency (NAE) in a wheat-corn cropping system at four sites (Changping, Zhengzhou, Yangling, and Qiyang) in China. Treatments included unfertilized control (CK), chemical fertilization only (N, NP, NK, and NPK), manure application (supplying 70% N) with NPK (NPKm) and at 1.5脳 rate (1.5NPKm), and NPK with corn stover returned (NPKs). The NP and NPK treatments resulted in generally higher yield, NUE and NAE than the N and NK for both wheat and corn demonstrating the importance of P in NUE improvement. The manure treatments resulted in significant increase or no decrease in the overall system NUE in all four sites with the highest mean NUE (49%) from NPKm treatment. In acid soil at Qiyang, only manure treatments resulted in significant increases of NUE and NAE indicating the importance of organic amendment. Wheat was more responsive to P fertilizer and corn was more responsive to manure in NUE improvement. Thus an effective nutrient management strategy is to ensure adequate P supply for the wheat crop and manure application for the corn crop to improve overall NUE for the wheat-corn production system.