江西农业大学学报2012，Vol.34Issue(6)：1071-1079,9.
不同氮钾用量配比对直播稻产量和品质的影响
Effects of Different Proportions of Nitrogen and Potassium amounts on Grain Yield and Quality of Direct-seeded Rice
摘要
Abstract
In order to provide rational application technology of dosage of nitrogen and potassium in direct-seeded rice,the effects of different proportions of three nitrogen amount levels of 120 kg/hm2, 165 kg/hm2, 210 kg/hm2 and three potassium amount levels of 90 kg/hm2, 150 kg/hm2, 210 kg/hm2 on the grain yield and quality of direct-seeded rice were studied. The result showed that the proportion of N2K3 had the best yield. The effects of different proportions of nitrogen and potassium amounts were remarkable on yield of direct-seeded rice. The nitrogen dosage of 165 kg/hm2 was optimal. The yield increased along with the application amount of potassium under the same nitrogen amount level. The effective panicles and grain nmbers of per panicle increased along with the application amount of potassium. To achieve the yield of over 9 000 kg/hm2, the nitrogen amount of 160 - 180 kg/hm2 and potassium oxide amount of over 180 kg/hm2 were required. There was a trend that the maximum grain filling rate was increased by added potassium amount under the lower nitrogen level, and that the maximum grain tilling rate represented a downtrend when the potassium a-mount increased under higher nitrogen level. The active grain filling period was the shortest and the mean grain filling rate was the biggest at the levels of 165 kg/hm2 nitrogen. The grain weight was positively correlated with maximum grain filling rate and active grain filling period. Added amount of potassium fertilizer reduced the chalky grain rate and chalkiness. The gelconsistency decreased along with the application amount of potassium. The alkali spreading value increased along with the application amount of potassium and nitrogen. The gelconsistency, alkali spreading value and the character parameters of grain filling, grain yield level were closely correlated.关键词
直播稻/氮钾配比/产量/品质Key words
direct-seeded rice/ proportioning of nitrogen and potassium amount/ yield/ quality分类
农业科技引用本文复制引用
李木英,陈志攀,石庆华,潘晓华,谭雪明..不同氮钾用量配比对直播稻产量和品质的影响[J].江西农业大学学报,2012,34(6):1071-1079,9.基金项目
农业部超级稻研究专项"长江中下游稻区超级稻配套栽培技术开发与技术集成"、江西省科技厅"江西省重大战略产品科技创新项目"(2008AB00800)和科技支撑计划项目(2009BNA03700) （2008AB00800）
