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红壤丘陵区稻田氮素释放试验结果初步表明 :施用无机肥 ,早稻生长期间土壤NH4 -N释放量多 ,释放速度快 ,早稻生长发育快 ,构成单位面积的有效穗数多 ,产量高 ,且差异极显著。施用有机肥 ,晚稻生长期间土壤释放NH4 N量多 ,且时间长 ,这对促进晚稻生长 ,形成合理群体结构有利。而有机、无机肥配合施用 ,稻田氮素释放时间长 ,且较稳定 ,对构成合理的水稻群体结构更为有利 ,产量优势极显著
The results of nitrogen release from paddy fields in red soil hilly region showed that the application of inorganic fertilizers increased the release of NH4-N and the release rate of NH4-N during the growth of early rice. The growth and development of early rice were fast, the number of effective panicles per unit area was high and the yield was high significant. Application of organic manure, late rice growth during the release of NH4N soil and more, and a long time, which is conducive to promoting late rice growth, the formation of a reasonable population structure. However, application of organic and inorganic fertilizers combined with long-term and stable nitrogen release from paddy fields was more favorable to the reasonable structure of rice population, with significant yield superiority