variationcharacterofgrainyieldperunitareainmaingrainproducingareaofnortheastchina

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	variationcharacterofgrainyieldperunitareainmaingrainproducingareaofnortheastchina
	CHENG Yeqing 1; ZHANG Pingyu 2; ZHANG Huimin 2
	2007
Source Publication	chinesegeographicalscience
ISSN	1002-0063
Volume	17 Issue:2 Pages:110
Abstract	Based on the surveys and the statistic data during 1980-2003, the variation character of grain yield per unit area in Northeast China and its main factors have been discussed by the methods of statistics and grey correlation analysis. The results show that: 1) the grain yield per unit area has been taking on an increasing trend in the recent 20 years. It increased from 2519.80kg/ha in 1980 to 4216.11kg/ha in 2003, with an increasing rate of 67.32%; 2) the variation of grain yield per unit area is considerably prominent and its range is also very great, with the maximal increase rate of 42.59% and maximal decrease rate of 21.13%, respectively, which are far above the whole Chinese average level; 3) the variation of main crops' yield per unit area is remarkable, which takes on the character that the yield of corn is much higher than that of soybean and rice; and 4) the grey correlation analysis shows that the most important factors impacting the variation of grain yield per unit area are the total power of agricultural machinery, the consumption of chemical fertilizer and effective irrigated area. However, the influence of natural disaster and income level should not be ignored. Effective ways to improve grain yield per unit area are to construct farmland improvement groundwork, reclaim the middle- and low-yield farmland, etc.
Language	英语
Document Type	期刊论文
Identifier	http://ir.igsnrr.ac.cn/handle/311030/99729
Collection	中国科学院地理科学与资源研究所
Affiliation	1.Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences 2.中国科学院东北地理与农业生态研究所
Recommended Citation GB/T 7714	CHENG Yeqing,ZHANG Pingyu,ZHANG Huimin. variationcharacterofgrainyieldperunitareainmaingrainproducingareaofnortheastchina[J]. chinesegeographicalscience,2007,17(2):110.
APA	CHENG Yeqing,ZHANG Pingyu,&ZHANG Huimin.(2007).variationcharacterofgrainyieldperunitareainmaingrainproducingareaofnortheastchina.chinesegeographicalscience,17(2),110.
MLA	CHENG Yeqing,et al."variationcharacterofgrainyieldperunitareainmaingrainproducingareaofnortheastchina".chinesegeographicalscience 17.2(2007):110.

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