Maize (Zeamays L.) is an important plant to the livestock feed and an food for many people in the world. Fertilization timing has been significant in enhancing the effect of nitrogen (N) and increasing productivity. At present, N is usually applied to 3 stages: 4-5 leaves, 8-9 leaves and especially 10 days before tassel emergence, in which N content in stem and leaves has correlated with the performance of productivity.