[目的]确定并验证杂交水稻高产栽培精确施氮技术的3个重要参数.[方法]以黔优18、茂优601等品种为试材,在贵州省小河、乌当和兴义进行试验示范,求取了杂交籼稻精确定氮高产栽培中的3个重要参数,并对其进行了论证示范.[结果]3个参数分别为:①100 kg稻谷吸氮量:1.85 kg(迟熟籼稻)、1.82 kg(早熟籼稻);②土壤空白供氮量在95.92～133.41 kg/hm2;③氮肥当季利用率:当基蘖肥与穗肥比例为5∶5时,得出获取高产的氮肥当季利用率为45.18%(迟熟籼稻)、44.72%(早熟籼稻).根据获得的3个参数分别在当地进行示范,均获1.2 t/hm2以上产量.[结论]为指导贵州省不同稻区的科学施肥提供了理论依据.%[ Objective ] The aim was to determine and validate the 3 important technical parameters of precision nitrogen fertilization in hybrid rice high-yield cultivation. [ Method ] 3 important technical parameters of precision nitrogen fertilization in hybrid rice high-yield cultivation were tested and validated by taking Qianyou 18, Maoyou 601 etc. as tested materials in Xiaohe, Wudang and Xingyi areas of Guizhou Province. [ Result] The nitrogen re quirement for 100 kg grain was 1.85 kg for late-maturing indica rice and 1.82 kg for early-maturing indica rice.The soil basal nitrogen supply was from 95.92 to 133.41 kg/hm2. The nitrogen use efficiency which was tested by different proportions of basic tiller fertilizer and panicle fertilizer was 45.18％ for late-maturing indica rice and 44.72％ for early-maturing indica rice. The 3 technical parameters were validated by huge area cultivation in the locality, and all the grain yield was over 1. 2 t/hm2. [ Conclusion] The research provides theoretical basis for guiding the scientific fertilization in different rice areas of Guizhou Province.
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