Effect of nitrogen fertilizer and farm yard manure on physiological traits of maize under water deficit condition

This experiment was conducted at Islamic Azad University Research Farms, Arak, Iran during the growing season 2010. The experiment model was split plot based on a randomized complete block design with four replications. There were two factors, water deficit stress at three levels of 100, 80 and 60 crop water requirement as main plot and combination of nitrogen fertilizer and farm yard manure (FYM) in six levels as sub-plots. The results showed that effect of water deficit, FYM and nitrogen fertilizer on leaf chlorophyll, canopy temperature, leaf relative water content, membrane stability, protein and grain yield was significant. Application of nitrogen fertilizer and FYM tinder optimum and deficit stress could increase content leaf chlorophyll as compared to the same conditions. Deficit stress increased per cent of grain protein. The highest grain protein equal to 9.7% was obtained from 100% nitrogen fertilizer. Interaction effect of treatments showed that the highest grain protein equal to 10.7 was obtained from treatments of 60 crop water requirement alongwith combination of 50% nitrogen fertilizer and 50% FYM. The highest grain yield equal to 6900 kg/ha was obtained from treatments of 80 crop water requirement alongwith combination of 50% nitrogen fertilizer+50% FYM. It was concluded that with irrigation equal to 80% water requirement+50% nitrogen fertilizer+50% FYM optimum yield was obtained.