| Change trend of grain yield per hectare and its impact factors in Henan Province |
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| DOI：10.7606/j.issn.1000-7601.2012.04.43 |
| Key Words: grain yield per hectare trend analysis impact factor |
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| Abstract: |
| Based on the data of grain yield per hectare in Henan Province, the change of grain yield per hectare from 1978—2009 was divided into four stages. The change trend and characteristics of grain yield per hectare was systematically analyzed from 3 viewpoints of period, trend and stability. The result showed that the grain yield per hectare presented a rising trend on the whole and the variance between years was very large, the increasing years were the dominant, discrete coefficient decreased with time, and the long time interval stage's discrete coeffici
ent was greater than the short time interval stage's. The impact factors of grain yield per hectare were analyzed using grey system theory. The results showed that the related degree was in the order of irrigated area, total agricultural machinery power, consumption of chemical fertilizer, electricity consumed in rural areas, which also illustrated the change of agricultural production conditions' effect at different stages. |
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