Effect of Nitrogen fertilizer and Water Deficit Stress on Physiological indexes of corn (Zea mays L.)

A field Experiment was performed in randomized complete block design with split-plot arrangement with 4 replications during 2009 growing season to study the impact of Effect of Nitrogen fertilizer and water deficit stress on physiological indexes of corn (Zea mays L.). The main plots allotted to four irrigation regimes (T1=50, T2=100, T3= 150, T4= 200 mm evaporation from the surface of evaporation basin); sub plots allotted to 4 nitrogen amounts (N1=80, N2=130, N3=180 Kg N ha-1). Physiological indicators of growth were affected by drought. With increasing drought evaporation of 50 mm to 200 mm of evaporation basin evaporation pan evaporation increased considerably in the amount of LAI, plant growth rate, relative growth rate, net photosynthetic production or net uptake, leaf area ratio and weight ratio leaves emerged. With increasing drought of 50 to 100 mm of evaporation and evaporation basin 150 to 200 mm evaporation from class A evaporation basin A significant difference was observed. Test results showed that with increasing from 80 to 180 kg per ha nitrogen significant increase in the amount of leaf area index, plant growth rate occurred. Among the indicators of physiological growth net absorption analysis, the ratio of leaf area and leaf weight ratio less affected by nitrogen fertilizer was used. Considering the importance of leaf area index, plant growth rate and relative growth rate in the performance increase can conclude that major part of the yield thus reducing drought stress, related to improving physiological can be mentioned.