Analysis on change of production and factors promoting yield increase of corn in China
2008
Li Shaokun | Wang Chongtao
chinois. 对1949～2006年玉米产量变化数据进行分析。结果表明，50多年来，我国玉米单产提高了4270．5kg/hm. ,增幅为380．1％，年均增加101．85kg／hm. ；总产由1175万t提高到14548．5万t，增加了12.4倍，其中单产增加的贡献占82．1％，种植面积扩大的贡献为17．9％，总产量的提高主要依赖于单产的增加。在总结分析不同年代玉米单产提高的主要因素、技术特征和增产机理的基础上，提出了今后玉米生产发展需要解决的问题与对策。[著者文摘]
Afficher plus [+] Moins [-]anglais. Data analysis of corn yield from 1949 to 2006 showed that over the past 50 years, corn yield in China had increased 4 270.5 kg/ha, increasing by 380.1% and average annual growth of 101.85 kg/ha per unit area. Total yield had grown 12.4 times from 11.75 million tons to 145.49 million tons, of which 82.1% was contributed by yield per-unit increase and 17.9% by area expansion. Total yield increase was mainly attributed to the increase of yield per-unit. The important factors affecting corn yield and technical characteristics and the mechanism of yield increas- ing from different eras were summarized from breeding and cultivation measures and policy, and some suggestions were discussed about the future development of corn production in China.
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