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土壤缺磷是热带和亚热带地区作物生产的主要限制因子之一。本研究分析了14份热带、亚热带豆科绿肥施入土壤后对砖红壤有效磷含量影响的时间动态变化。结果表明,施用绿肥后不同时段能不同程度地提高土壤有效磷的含量,且施用绿肥后的土壤有效磷含量显著高于不施用绿肥土壤,其中木蓝(Magnolia lotungensis)对砖红壤有效磷含量增量变幅高达339%。此外,施用不同的绿肥对土壤有效磷含量的影响不同,但对土壤有效磷含量影响的基本规律一致。施用绿肥时砖红壤有效磷含量提高较大的最佳埋田时间为1个月。
Phosphorus deficiency in soils is one of the major limiting factors for crop production in tropical and subtropical regions. This study analyzed the temporal dynamics of the effects of 14 tropical and subtropical leguminous green manure on soil available P content in the latosol. The results showed that the contents of soil available P could be increased to different degrees after application of green manure, and the content of available phosphorus in soil after applying green manure was significantly higher than that of no-manure soils. Magnolia lotungensis increased Change up to 339% volume. In addition, the application of different green manure on soil available phosphorus content of different, but the impact of soil available phosphorus content consistent with the basic laws. The best landfill time for improving available phosphorus content in brick red soil was 1 month when green manure was applied.