The Effect of Irrigation cutting on Water use Efficiency and Proline Content of Six Sweet Corn Varieties in Milajerd Conditions

This experiment was conducted as split plots in randomized complete block design with four replications in 2014 and 2015 at Research Farm of Payam Noor University, Milajerd branch. Irrigation cuttings included S0: Complete irrigation, S1: Irrigation cut at 8-leaf stage, S2: Irrigation cut off at seed filling stage as main plots and six different hybrids of sweet corn including Merit, Basin, Obsession, Chase, KSC.404, KSC .403 in sub plots. The results of interaction of treatments showed that the highest grain yield was obtained from full irrigation treatment at Obsession with 8912 kg. ha-1 and the lowest grain yield was obtained from 8 liters of broth treatment in Merit with 7102 kg. ha-1 which The difference was 25.84%. The highest water use efficiency was obtained in irrigation cuttings at 8-leaf stage in Obsession hybrid with a mean of 0.65 kg. m-3 and the lowest in the total irrigation method in Merit with a mean of 0.19 kg. m-3, with a difference of 226%. The highest amount of proline observed in the irrigation cuttings at the 8th leaf stage in Merit hybrid with mean of 12.23 mg. g-1 and the lowest in full irrigiation hn Obsession hybrid with 22.11 mg. g-1, which had a significant difference at 1% level. According to the results of research, in irrigated cutting pattern, it is recommended to use cut off at seed filling stage with 14% reduction of water consumption in sweet maize varieties, especially in Basin and Obsession hybrids for Milajerd region in Markazi province.