An optimal regional nitrogen application threshold for wheat in the North China Plain considering yield and environmental effects
文献类型： 外文期刊
作者：
Wang, Hongyuan
1
;
Zhang, Yitao
1
;
Chen, Anqiang
3
;
Liu, Hongbin
1
;
Zhai, Limei
1
;
Lei, Baokun
3
;
Ren, Tianzhi
4
;
作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Minist Agr, Key Lab Nonpoint Source Pollut Control, Beijing 100081, Peoples R China
2.Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA
3.Yunnan Acad Agr Sci, Agr Environm & Resources Inst, Kunming 6502052, Peoples R China
4.Minist Agr, Inst Agroenvironm Protect, Tianjin 300191, Peoples R China
关键词： Wheat yield;Nitrogen application rate;Soil inorganic nitrogen residual;Nitrate nitrogen leaching;Ammonia volatilization;Nitrogen threshold
期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）
ISSN：
年卷期：
页码：
收录情况： SCI
摘要： North China Plain is the bread basket for Chinese. However, the over-use of N fertilizer has resulted serious environmental pollution and even threat the food security owing to the soil degradation in North China Plain. It is essential to develop a suit of optimal regional nitrogen application threshold. In this study, we attempted to build the threshold by using dataset of literature review and field experiments. Results showed that the optimal N fertilizer rate should be around 185 kg N ha(-1) for the wheat cultivation with achieved yield at 7000 kg ha(-1). Both literatures reviewed and field experiments agreed well on this threshold. The wheat yield under this optimal N fertilizer rate was about 2% lower than the theory maximum achievable yield (7203 kg ha(-1)) in this region; however, the N rate could be reduced by 25% compared to the N rate under the maximum yield. This threshold entailed decreases of 25.25%, 20.17%, 27.89% and 38.80% in nitrogen application rates, residual inorganic soil nitrogen (0-100 cm), nitrate leaching and ammonia volatilization, respectively, on the regional scale. In addition, reducing theory maximum achievable yield by 2% was not statistically significant and would not result in additional risks because fluctuations in wheat yields over time (-57.07% to 34.73%) and space (-23.78% to 33.07%) were higher than 2% in this area. (C) 2017 Published by Elsevier B.V.
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