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

Journal of Integrative Agriculture 2015年第8期14卷 1534-1541页

作者： WANG Zhan-biao WEN Xin-ya ZHANG Hai-lin LU Xiao-hong CHEN Fu College of Agronomy and Biotechnology China Agricultural University/Key Laboratory of Farming System Ministry of Agriculture

Excessive use of N fertilizer in intensive agriculture can increase crop yield and at the same time cause high carbon（C） *** study was conducted to determine optimized N fertilizer application for high grain yield and lower C emissions in summer corn（Zea mays L.）.A field 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 all 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 *** GHG emision compontents, N fertilizer（0–51.1%） was the highest and followed 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 efficiency and decrease GHG emissions in corn production.

关键词： maize nitrogen fertilizer rate grain yield net energy ratio greenhouse gas emissions

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Effects of Different nitrogen fertilizer rates on Soluble Sugar,Starch and Root Tissue Structure of the Peach Trees

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Agricultural Science & Technology 2011年第12期12卷 1861-1863页

作者：潘春香肖艳辉新居直祐中尾義則韶关学院英东农业科学与工程学院广东韶关512005 日本名城大学农学部

[Objective] The research aimed to provide theoretical basis for the cultivation and production of peach.[Method] The three-year-old seedling peach tree was used as the materials,and NH4NO3 was used as the experimental nitrogen *** nitrogen levels,0,3,6 g per pot respectively were set to study the effects of different nitrogen fertilizer on the contents of soluble sugar,starch and internal structure of the root of the peaches.[Result] The contents of soluble sugar of roots and leaves increased with the increase of nitrogen fertilizer level,and the level of 6 g per pot was the highest,which showed extreme differences between the level of 3 g per pot and the ***,starch contents showed opposite results,which decreased as the level of nitrogen fertilizer *** with the 3 g per pot level of nitrogen fertilizer and the control,the internal structure of root applied with nitrogen fertilizer of 6 g per pot level had larger fibrovascularcylinder,advanced vascular bundle,small-spaced thin-walled cells,smooth and full cells with smooth cell wall.[Conclusion]Appropriate nitrogen levels can accelerate the accumulation of soluble sugar and the growth of root tissue structure.

关键词： Peach nitrogen fertilizer rate Soluble sugar Starch Root tissue structure

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