江西农业大学学报Issue(6)：1126-1133,8.
不同氮钾配比对直播早稻氮素吸收与利用的影响
Effects of different proportions of nitrogen and potassium amounts on the nitrogen absorption and utilization in the direct-seeded rice
摘要
Abstract
Under the condition of different proportion of three nitrogen amounts with three potassium a -mounts ,the effects of different proportions of nitrogen and potassium amounts on the nitrogen absorption and u -tilization were discussed .The result indicated:the total accumulation and utilization of nitrogen were the highest in the N2 K3 treatment.At the same nitrogen level,the nitrogen accumulation increased with potassium fertiliz-er amount,there were significant differences among different treatments.The nitrogen accumulation showed no significant difference when the nitrogen amount was 165 kg/hm2 and 210 kg/hm2 at the same level of potassi-um fertilization.The increase of nitrogen and potassium amounts was conducive to raising nitrogen accumulation before the panicle differentiation stage of direct-seeded rice .The increase of nitrogen and potassium amounts was conducive to raising the nitrogen distribution proportions in vegetative organs ,and nitrogen distribution pro-portion in panicle decreased with increase of amount of potassium applied .The nitrogen translocation rate and contribution rate of each organ nitrogen to grain increased with the increase of nitrogen fertilizer amount .The ni-trogen transport rate of leaf and sheath declined with increased amount of potassium fertilizer at the level of ni -trogen fertilizer of 120 kg/hm2 and 165 kg/hm2 .Potassium fertilizer had obvious influence on the nitrogen translocation rate at the level of nitrogen amount of 210 kg/hm2.The activites of NR,GOGAT,GS increased with nitrogen fertilization before heading .The activity of nitrogen metabolism enzyme of N 2 treatment was the highest usually after heading .The activites of NR,GOGAT,GS increased with potassium fertilizer .The nitrogen agronomy utilization ratio of N 2 was the highest at three nitrogen fertilizer levels .Increase of potassium fertilizer amount improved the utilization rate of nitrogen with the same amount of nitrogen fertilization ,this effect was significant at low nitrogen levels .The increase of fertilization amount of nitrogen and potassium decreased the harvest index of nitrogen .165 kg/hm2 of nitrogen and 210 kg/hm2 of potassium made the best coordination group for cultivation of direct-seeded rice .关键词
直播稻/氮钾配比/氮素吸收利用Key words
direct-seeded rice/nitrogen and potassium proportion/nitrogen uptake and utilization分类
农业科技引用本文复制引用
李木英,陈志攀,谭雪明,石庆华,潘晓华..不同氮钾配比对直播早稻氮素吸收与利用的影响[J].江西农业大学学报,2013,(6):1126-1133,8.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”和江西省科技厅“科技支撑计划项目” （）
