Based on the agricultural meteorological observation data of winter wheat and summer maize in the middle region of Shaanxi Province from 1992 to 2010,the growth stage changes of two major crops,winter wheat and summer maize,had been analyzed.The results showed that the entire growth period of winter wheat in this region reduced by 2.96 days per decade.The changing trends in most sites are very similar,but the rate is different.The periods from sowing to emergence,turning green to jointing,jointing to headin...
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