节水灌溉条件下施肥与密度对双季晚稻‘丰源优299’产量和稻米品质的影响

Effects of Fertilization and Density on Yield and Grain Quality of Late Rice 'Fengyuanyou299' Under the Condition of Water Saving Irrigation

本试验采用裂区设计对节水灌溉条件下不同施氮量和栽植密度对双季晚稻‘丰源优299’的产量和品质的影响进行了研究。试验结果表明：随着施氮量的增加,稻米垩白粒率、垩白度和蛋白质含量分别增加8.5%-20.0%、0.8%-1.8%、7.0%-43.4%,胶稠度、直链淀粉含量分别降低5.8%-20.3%、3.7%-6.6%。随着栽植密度的增加,碾米品质和稻米蛋白质含量先增加后降低,垩白粒率、胶稠度及稻米直链淀粉含量有减少的趋势,而垩白度有增加的趋势。施氮量为135 kg/hm2,密度为30万穴/hm2时,增产1.0%-34.7%,为最优的施肥与栽植密度组合。

Field experiments with split block design under water saving irrigation were conducted toinvestigate the effect of different nitrogen fertilizer levels and planting densities on grain yield and rice qualityof the double cropping late rice cultivar‘Fengyuanyou299＇. The results showed that the chalky rice rate,chalkiness degree and protein content increased by 8.5%-20.0%, 0.8%-1.8% and 7.0%-43.4%, respectively,with the increase of nitrogen application amount, while the gel consistency and amylose content decreased by5.8%-20.3% and 3.7%-6.6%. The milling quality and rice protein content increased first and then decreasedwith the increase of planting density, the chalky ratio, gel consistency and amylose content showed a downwardtrend, however, the chalkiness degree increased. In this research, the grain yield increased by 1.0%-34.7%when the nitrogen application rate was 135 kg/hm2 and the planting density was 300000 hill/hm2, it was theoptimal treatment combination.