Abstract:

Aimed to know effect of sulfur coated urea(SCU) on summer maize and improve N utilization efficiency, field experiment was conducted to study the effect of sulfur coated urea and urea under different dose and applied methods on the growth and yield of summer maize. Two urea treatments were applied in conventional way (basal dressing plus once topdressing) with nitrogen application rate of 180 kg/hm2 (CK180,custom dose) and 126 kg/hm2 (CK126) respectively, while sulfur coated urea treatment (PCU) was applied by basal application with nitrogen application rate of 180 kg/hm2（SCU180）,126 kg/hm2（SCU126）and 90 kg/hm2（SCU90）respectively. The results showed that there were no significant differences in grow and yield among the treatments of SCU180,SCU126 and CK180. The yield of SCU180 and SCU126 were 10789.17 kg/hm2 and 10595.11 kg/hm2respectively. Applying SCU on summer maize could significant improve N utilization efficiency and N production rate. N utilization efficiency and N production rate of treatment of SCU126 was 42.59% and 20.74kg/kg respectively. Therefore, it can be speculated that SCU can be used by single basal application to summer maize production system, that help to change twice fertilization （basal and dressing） to one fertilization （basal） , and thus benefit to labor-saving, fertilizer-saving and profit-increasing.