Determining the Best Time and Method of Nitrogen Fertilizer Aplication on Corn in Fasa, Iran

Considering the culture of corn in a vast area of Fasa farms and the importance of the application of nitrogen fertilizer and the fact that most farmers apply this fertilizer to corn without knowing the needs of this plant, and finally the fact that the overdose of this fertilizer has bad biological and environmental effects and makes the land salty, in June 2004 a research project was launched on the best time to apply nitrogen fertilizer on corn on the test farm of IAUFB. In this project three methods were tested: spraying, banding fertilizer, fertigation based on three time schedules: one, one and a half and two months after cultivation. The test was replicated three times in a factorial experiment and in a randomized complete block design. It became clear that the fertilizer is really effective in the very early stages of growth that is, the first 25 to 75 days of growth. In pervious experiments the same results were observed. The N.P.K elements were more effective in this stage that is one two months after culture. It also became known that culture had the best effect on the third stage, that is, two months after culture and the best method was spraying because the plant can use it more easily.