条播方式下不同播种量对水稻产量的影响

Effects of Different Sowing Rates on Rice Grain Yield Under Drill-seeded Conditions

探讨条播方式下,播种量对水稻生育期与产量性状的影响。结果表明:减少播种量,水稻始穗期、齐穗期、成熟期均有所提前;播种量对水稻有效穗数、每穗实粒数、产量均无显著影响,对千粒质量影响显著(P<0.05);在15 kg/667 m2播种量下,水稻千粒质量与产量最高。建议条播稻播种量控制在15 kg/667 m2以下,既节省生产成本,又利于水稻成熟和产量提高。

This study investigated the effects of different sowing rates on rice growth duration and grain yield under drill-seeded conditions in 2017 in the field of the experimental base of Shandong Rice Research Institute. The tested rice cultivar was the common Japonica cultivar Shengdao19, which was sown at three different rates： 15, 20, and 25 kg/667 m2. The results indicated that initial heading stage, full heading stage, and maturity were all advanced with the reduction in sowing rate. On the other hand, the variation in sowing rate had no significant impact on the number of effective panicles, the number of filled grains per panicle, and grain yield,while it significantly influenced 1000-grain weight. Among the three sowing rates, 15 kg/667 m2 resulted in the highest 1000-grain weight. This result suggests that, in a drill-seeded rice system, the sowing rate below 15 kg/667 m2 could produce beneficial effects of enhancing grain yield as well as reducing production cost. In the future, further researches should assess the effect of the optimum sowing rate（no more than 15 kg/667 m2） on different rice cultivars in a drill-seeded rice system.