Techniques of assembling fertilization for maize in black soil area

The experiment on techniques of assembling application of organic, biological and chemical fertilizers and its effects on soil fertility, seed yield and economic profits has been conducted. The results show that positive correlation among the soil fertility, seed yield and economic profits is significant in all treatments. The organic matter content in the soil of assembling fertilization increases by 0.01%～0.3%，seed yield increases by 10%～16.9% and net income increases by 932.6～1496.6Yuan (RMB)/hm² compared with single chemical fertilizer application.