Abstract: The present paper deals with the productivity and utilization efficiency of fertilizer - N in maize sown in different season in Mengzi, Yunnan province. The results are as follow: There are different utilization of fertilizer - N including the absorbing amount,transferring rate and productivity in the plants sown in different season. They have a depressive trend of utilization efficiency from that sown in Winter(64.7%), in Spring (61.2%), in Summer(49.6%),in Autumn(41.4%).

Key words: Different sowing - season maize