氮肥施用量和栽插密度对迟熟中粳品种稻米品质的影响

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中图分类号：S511 文献标志码：A 文章编号：1671-4652（2025）02-0048-10

ABSTRACT： In this study，four Japonica varieties including Wumijing（C1），Wuyujing 3R（C2），Wuyunjing 24（C3）， and Huaidao 5（C4）were selected to explore the effectsof the grainquality 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 OOo （B1），30O O00（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 thatof Aland A4，which indicated that appropriate nitrogen application was beneficial tothe improvement of milled rice rate.In general，withtheincreaseofnitrogenapplication，theproteincontentofallvarietiesofmilledricewassignificant lyincreased，whilethechalkinessgrain percentageandchalkinessdegreedecreasedsignificantlywiththe increaseof nitro gen application. Compared with dense planting，sparse planting was beneficial to improve processing quality and appearance quality，and the efectof planting densityonthe protein contentof milled rice was relativelysmall.Overall，A3B3 combinedcultivation conditions can significantlyimprove thequalityof ricein this experiment.Our results canprovidea referenceforscientific nitrogen fertilizer aplication and reasonable planting density for high efficiencyand high quality cultivation of late maturity japonica varieties.

KEY WORDs： Japonica rice; nitrogen application amount; planting density; grain quality

我国是全球最大的粳米生产国和消费国，粳米产量占全球总产量的近 70% ，消费量占全球消费总量的 60% 。（剩余15281字）