Effects of Different Planting Density on Yield of Maize under Controlled Release Fertilizer with Black Film Mulching Condictions

In order to explore the appropriate planting density of maize,single randomized block test of 6planting density was applied on effect of different planting density on yield,plant traits and economic traits of maize.The results showed that the yield of maize increased with the increase of planting density at beginning and decrease after a certain planting density,the yield of planting density is the greatest,yielded 640.76kg/667m2,increased 6.86%compare to other densities,it's significantly and extreme significantly higher than others.Diameter of plants,cornjob,number of grains,grains weight is decreased with the increase of planting density,tip length,vacant stem rate increased with the increase of planting density.But other 6traits are not significant.So planting density of 3400plants/667m2 was proposed in areas of Sinan,Guizhou.