Grey correlation analysis on the influence factors of Anhui Province's grain yield

In food production,there are many factors influencing grain yield.Based on the grain yield of Anhui Province and the related indicators from 2000 to 2009,by calculating the grey correlation degree which indicates different influence factors of grain yield to have different impact on grain yield,we've obtained a descending sequence of the factors such as chemical fertilizer,total sown area grain,rural employee number,effective irrigative area,total agricultural machinery power,per capita net income of farmers.Among the 6indices selected,chemical fertilizer and total sown area of grain have great influence on the grain yield,and the per capita net income of farmers has little influence on the grain yield.