Net energy yield and carbon footprint of summer corn under different N fertilizer rates in the North China Plain

WANG Zhan-biao; WEN Xin-ya; ZHANG Hai-lin; LU Xiao-hong; CHEN Fu

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Net energy yield and carbon footprint of summer corn under different N fertilizer rates in the North China Plain

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Excessive use of N fertilizer in intensive agriculture can increase crop yield and at the same time cause high carbon (C) emissions. This study was conducted to determine optimized N fertilizer application for high grain yield and lower C emissions in summer corn (Zea mays L.). A ifeld experiment, including 0 (N0), 75 (N75), 150 (N150), 225 (N225), and 300 (N300) kg N ha–1 treatments, was carried out during 2010–2012 in the North China Plain (NCP). The results showed that grain yield, input energy, greenhouse gas (GHG) emissions, and carbon footprint (CF) were al increased with the increase of N rate, except net energy yield (NEY). The treatment of N225 had the highest grain yield (10 364.7 kg ha–1) and NEY (6.8%), but the CF (0.25) was lower than that of N300, which indicates that a rate of 225 kg N ha–1 can be optimal for summer corn in NCP. Comparing GHG emision compontents, N fertilizer (0–51.1%) was the highest and fol owed by electricity for irrigation (19.73–49.35%). We conclude that optimazing N fertilizer application rate and reducing electricity for irrigation are the two key measures to increase crop yield, improve energy efifciency and decrease GHG emissions in corn production.

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《农业科学学报（英文版）》 |2015年第8期|1534-1541|共8页
作者
WANG Zhan-biao; WEN Xin-ya; ZHANG Hai-lin; LU Xiao-hong; CHEN Fu;
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Col ege of Agronomy and Biotechnology, China Agricultural University/Key Laboratory of Farming System, Ministry of Agriculture, Beijing 100193, P.R.China;

Col ege of Agronomy and Biotechnology, China Agricultural University/Key Laboratory of Farming System, Ministry of Agriculture, Beijing 100193, P.R.China;

Col ege of Agronomy and Biotechnology, China Agricultural University/Key Laboratory of Farming System, Ministry of Agriculture, Beijing 100193, P.R.China;

Col ege of Agronomy and Biotechnology, China Agricultural University/Key Laboratory of Farming System, Ministry of Agriculture, Beijing 100193, P.R.China;

Col ege of Agronomy and Biotechnology, China Agricultural University/Key Laboratory of Farming System, Ministry of Agriculture, Beijing 100193, P.R.China;

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Net energy yield and carbon footprint of summer corn under different N fertilizer rates in the North China Plain

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