Abstract: A field experiment with colophony-coated fertilizer (CRF) and sulfur-coated fertilizer (SCF) showed that under the same application rates of N, P
and K, applying CRF and SCF increased the summer maize grain yield by 13.15% and 14.15%, respectively, compared to the application of common compound fertilizer CCF. When the applied amount of CRF and SCF was decreased by 25%, the yield increment was 9.69% and 10.04%, respectively; and when the applied amount of CRF and SCF was decreased by 50%, the yield had less difference with that under CCF application. The field ammonia volatilization rate in treatments CRF and SCF increased slowly, with a peak appeared 7 days later than that in treatment CCF, and the total amount of ammonia volatilization in treatments CRF and SCF was ranged from 0.78 kg N·hm^-2 to 4.43 kg N·hm^-2, with a decrement of 51.34%-91.summer maize; controlledrelease fertilizer; ammonia volatilization;

Key words: summer maize, controlled-release fertilizer, ammonia volatilization,  yield, fertilizer nitrogen use efficiency, human activity, ecological transitional belt, landscape pattern, ecological risk assessment, risk management.