Effect of Tillage Systems and Nitrogen Fertilizer on Agro Physiological Characteristics of Corn

To investigate the effect of tillage systems and nitrogen fertilizer on corn characteristics, in 2016 and 2017, a research field was conducted in the research farm of Islamic Azad University Chalous Branch during two cropping years.The experiment was performed as a split-plot in a randomized complete block design with three replications. Experimental factors include tillage at three levels (no-tillage, conservation tillage and conventional tillage) in the main plot and nitrogen fertilizer sources at four levels, including non-application of zero, 33, 66,and 100% of the recommended amount of nitrogen fertilizer based on the test. The soil was on a subplot.Comparing the average effect of tillage showed that the highest grain yield was obtained in conservation tillage treatment at the rate of 10247 kg/ha-1. Comparison of tillage's average effect showed that the highest biological product was received in conservation tillage at the rate of 15754 kg/ha-1. Comparison of the average interaction of the year in tillage also showed that the highest NUPE was observed in the conservation tillage treatment in the second year at the rate of 0.90 kg.kg-1, which showed an increase of 47% compared to the treatment no tillage in the first year. NUPE in tillage treatments increased in the second year compared to the first year, which was higher in conservation and non-tillage tillage treatments. Comparison of the average treatment of nitrogen fertilizer showed that the highest grain nitrogen was obtained in the treatment of 100% nitrogen fertilizer at the rate of 1.98%, which showed an increase of 25.7% compared to the control treatment.In general, the results of this study showed that by applying conservation tillage methods, the least damage can be done to the soil structure, and through this, maximum yield and efficiency can be achieved in the corn plant. Therefore, according to grain yield, the most appropriate treatment for the study area is the use of conservation tillage in the case of fertilizer application of 66% nitrogen.