摘要
通过在湖北省几种主要成土母质上对不同水型水稻土施用氮磷肥效果及施用技术的研究．初步明确了氮肥的施用效果为淹育型水稻土＞潴育型水稻土＞潜育型水稻土．磷肥效果与之相反．从土壤养分状况、氮肥和磷肥的当季利用率、土壤微生物、土壤还原性物质含量和水土温度等方面，初步分析了不同水型水稻土氮磷肥效果差异的原因．提出了不同水型水稻土氮磷肥的施用技术．
The result of research on the efficiency and technique of rice nitrogen and phosphate fertilization under different soil water conditions showed that the nitrogen efficiency on these paddy soils was in the order of gleyed paddy soil (GLP)<periodically waterlogged paddy soil(PWLP)<submergic paddy soil (SMP). The phosphate efficiency on the soils turned out contrary to that of nitrogen.This paper discusses the causcs of the different nitrogen and phosphate application efficiency through the aspects of soil organic matter, soil microflora and biomass,soil Eh and pH, soil temperature, soil reducing substance content, utilization ratio of NP fertilizers and soil phosphate fractions, etc. The paper also recommends the optimum N and P application rates and times under the local condition.
关键词
水稻土
施肥
氮肥
磷肥
paddy soil, water condition, nitrogen application, phosphate application
