节水灌溉对水稻产量形成的影响

从灌溉方式、品种类型、栽插密度和施肥量研究了对水稻汕优63和盐粳2号产量形成的影响.结果表明,库限制型品种盐粳2号,常规灌溉的产量高于节水灌溉;源限制型汕优63,节水灌溉的产量与常规灌溉相近.在中肥条件下,常规灌溉的产量高;在高肥条件下.节水灌溉的产量接近或超过常规灌溉.在节水灌溉时,增加栽插密度有明显的“以密补水”的作用.节水灌溉区每亩穗数、每穗粒数减少,结实率相应提高,但千粒重在两类灌溉方式处理间差异甚小.

EFFECT OF WATER-SAVING IRRIGATION ON THE YIELD FORMATION OF RICE

It was studied that the effect of irrigation methods, the variety types, densities of transplantation and the amount of nitrogen fertilizer applied on the yield formation of rice in this paper. The results showed that the treatment factors had interacted effects on the yield formation: for the variety of sink-limited type of Yanjing 2, the yield of the conventional irrigation treatment(CIT) was higher than that of the water-saving irrigation treatment (W-SIT), and for the variety of source-limited type of Sangyou 63, the Yield of W-SIT was close that of CIT; under the condition of medium fertilizer, the yield of CIT was higher than that of W-SIT, and the yield of W-SIT was close or higher than that of CIT under the condition of high fertilizer. Yanjing 2 had a significant effect of "water compensated by the density" if water-saving irrigation was conducted. The panicles per mu and spikelets per panicle reduced and the fil- led-percen-tage increased after water-saving irrigation. However, the difference of 1000-grain weight be- tween the conventional and water-saving irrigation was very small.