Effect of low irrigation Investigation of low irrigation effect

to attention of water limitation in Soybean cultivation, tolerance cultivar selection for increasing grain yield is very important. In this order a research carry out in field research Islamic Azad University of Karaj branch using of factorial split in form of randomize complete block design in four replication. Main factors include irrigation rate at two levels S1 = %40 and S2 = %70 water available depletion and irrigation method at three levels M1 = Normal furrow, M2 = With one furrow interval M3 = Two row planting plots and sub factor include two cultivar V1 = Williams and V2 = L17. Measured traits including: plant height, number pod per plant, harvest index, Total dry weight, 1000 grain weight and grain yield per unit area.According to experimented results interaction effect irrigation. Cultivar at p≤5 and low irrigation. Cultivar at p≤%1 on grain yield was significant. Williams cultivar in low irrigation have been highest grain yield (1909 kg/ha). The highest and lowest grain yield in L17 cultivars obtained in low irrigation (1/74 kg/ha).Also highest grain yield Williams cultivar obtained in one furrow interval irrigation method.