Effects of different application amounts of drug fertilizer on soil nutrient and yield of cassava

The effects of drug fertiliter on yield and related traits of cassava were studied by detection the contents of soil alkali hydrolyzable nitrogen，available potassium and available phosphorus，plant height，stem diameter，content of soluble sugar in leaf and root，main economic characters and yield of cassava. Four treatments were set with XinXuan048 as material，respectively CK（0 kg/hm2），300 kg/hm2，600 kg/hm2 and 900 kg/hm2. The results showed that the nutrient status of soil and contents of soil alkali hydrolyzable nitrogen，available potassium and available phosphorus were improved by using drug fertilizer，thus good for the growth of cassava and the improvement of root traits，and could increase the content of soluble sugar of root.Compared with control，the yeild of 300 kg/hm2， 600 kg/hm2 and 900 kg/hm2 treatments increased by 21.20%，23.91% and 14.31%，which showed that suitable drug fertilizer was condutive to the yield of cassava，but the yield decreased by too much drug fertilizer. In consideration of cost，root traits and yield，the effect of 300 kg/hm2 treatment was the best others.