Document Type : Research Paper
Water crisis is a main factor of crop cultivation limit in growing season. For different crops, knowledge of sensitive irrigation timing is necessary for maximizing yield and amount of irrigation water. Thus in order to investigate the effect of water stress on different growth stage of maize, a field study was carried out during 2009 to 2011 growing season in Mazandaran province. Experiment was conducted using randomized complete block design with four replications and nine treatments. Irrigation treatment was tested with 30, 60 and 90% water depleted before and after flowering stage. The amount of irrigation water was determined by weighing method to reach soil moisture to the field capacity. The results of the comparison of the three-year average yield showed that the highest yield (13400 kg ha-1), water use efficiency (3 kg /m3) and irrigation water use efficiency (4.25 kg /m3) were obtained by 30% water depletion before and after flowering stage treatment. In general, it can be concluded that increased stress before flowering had a significant effect on yield and water use efficiency of maize. So, the increase in stress before flowering caused a more severe reduction in the yield and water use efficiency of maize.