摘要
1987年在中国水稻研究所试验场应用^(15)N示踪技术进行了多处理的田间微区试验。结果表明:氮肥作基肥使用时,水稻对N素的吸收利用率差异不显著,而随着施用量的增加,在土壤中的N素残留率降低,而氮肥损失率显著提高;基肥配施P、K肥对肥料N的去向无显著影响,但配施适量稻草有助于提高水稻对肥料N的吸收量和土壤残留量,降低氮素损失;氮肥的使用期对肥料^(15)N去向的影响十分显著,追肥的N素利用率比基肥高;稻田采用”以水带氮”深施技术能明显地提高水稻的氮素吸收,增加土壤残留率和减少氮素损失,表明此技术是一项合理的稻田氮肥深施技术。
The multiple microsplit experiment of ^(15)N-labeled urea were carried out at the CNRRI in 1987. When N applied as basal, N uptaked by rice plants was no significant difference under different N applied level, the N recovery in soil decreased, and N losses increased significantly with the increase of N applied. N applied as basal combined with P,K has no significant effect on the fate of N, basal dressing of urea with a moderate amount of straw increased the N efficiency and recovery in soil, and reduced the N losses. N efficieny of topdressing was higher than basal dressing. Fertilizer N uptaked by rice plants substantially increased with the technique for deep placement of urea topdressed in rice field with reftooding. It is shown that this technique is one of the most economical and practical techniques.
出处
《中国水稻科学》
CAS
CSCD
北大核心
1990年第3期122-126,共5页
Chinese Journal of Rice Science
关键词
水稻
尿素
^15N示踪技术
氮素去向
Rice
Urea
^(15)N-labeled
Fate of nitrogen
Deep placement of N fertilizer
Rice straw
