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...