氮肥总量及穗期氮肥比例对杂稻黔优568产量的影响

Effect of Total Nitrogen Amount and Nitrogen Ratio in Heading Stage on Yield of Hybrid Rice Qianyou 568

为形成杂交稻可量化的氮肥高效运畴技术,为生产实践提供理论依据,结合贵州的生产实际,以黔优568为研究对象,开展中、高海拔地区不同氮肥施用总量及穗期氮肥比例的研究。结果表明:不同氮肥施用量的水稻产量差异达极显著水平,一般肥力条件下,尿素用量11～15 kg/667m2能获得较高产量;在氮肥总量一定的条件下,不同的穗肥施用比例对产量的影响差异达极显著水平,穗肥比例为20%～30%水平下产量较高。产量构成因素与产量通径分析表明,黔优568穗粒数对产量的贡献最大,其次是单位面积穗数。

Study on different total Nitrogen（N） and N ratio in heading stage of hybrid rice Qianyou 768 was conducted in medium and high altitude areas in Guizhou considering the production situation to formulate a quantitative efficient logistics technology of N fertilization and provide theoretical support for hybrid rice production.The results showed that the rice yield under different N application was significantly different,rice could reach higher yield under 11-15 kg/667 m2 of urea application in general fertility level.With same total N application,the rice yield under different N ratio in heading stage was also significantly different,rice could reach higher yield under 20 %-30 % of N ratio in heading stage.The result of yield component analysis and path analysis showed that grain had the greatest contribution,followed by panicles per unit area.