氮肥施用量和栽插密度对迟熟中粳品种稻米品质的影响OA北大核心

In this study,four Japonica varieties including Wumijing(C1),Wuyujing 3R(C2),Wuyunjing 24(C3),and Huaidao 5(C4)were selected to explore the effects of the grain quality under four nitrogen rates including 360(A1),240(A2),120(A3)and 0(A4)kg·hm-2 as well as three planting density including 375 000(B1),300 000(B2)and 225 000(B3)plants·hm-2 in two years.The results showed that the milled rice rate of A3 was significantly higher than that of A1 and A4,which indicated that appropriate nitrogen application was beneficial to the improvement of milled rice rate.In general,with the increase of nitrogen application,the protein content of all varieties of milled rice was significant-ly increased,while the chalkiness grain percentage and chalkiness degree decreased significantly with the increase of nitro-gen application.Compared with dense planting,sparse planting was beneficial to improve processing quality and appear-ance quality,and the effect of planting density on the protein content of milled rice was relatively small.Overall,A3B3 combined cultivation conditions can significantly improve the quality of rice in this experiment.Our results can provide a reference for scientific nitrogen fertilizer application and reasonable planting density for high efficiency and high quality cultivation of late maturity japonica varieties.