Interactive Effect of Water and N Fertilizer on the Yield of Liaoyou 5218

Japonica hybrid cultivar Liaoyou 5218 was used to study the effect of N fertilizer management on the yield under different irrigation methods.N fertilizer management was named as A1(base fertilizer: tiller fertilizer: panicle fertilizer: grain filling fertilizer 3:3:3:1) and A2(4:4:2:0),respectively.The irrigation treatments included B1(traditional irrigation) and B2(water saving irrigation).The results showed that the higher yield of Liaoyou 5218 was obtained from treatment A2B2 and A1B1,being 11 406 and 11 306 kg/hm2,respectively.Since water saving irrigation treatment saved water by 40% compared with traditional treatment,A2B2 was regarded as the more profitable practice for growing Liaoyou 5218 in Liaoning Province.Under the two irrigation methods,panicle numbers decreased with increasing percent of base and tiller fertilizer.SPAD value of flag leaf decreased more rapidly in the water saving irrigation treatment than that in traditional treatment,which probably leads to the decrease of seed-setting rate.Then,improving panicle-bearing tiller rate and seed-setting rate should be the important way to exploit the yield heterosis.