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红壤的改良利用是当前全国科研的重要课题之一。红壤肥力的生态特点之一是磷的固定严重。目前化学方法测定土壤速效磷已经广泛用于探索土壤磷素的供应能力,并为作物施用磷肥提供一定的科学依据。国外测定土壤速效磷的方法多达(?),但各种方法适用的范围有限,不同土壤应采用不同的浸提剂,所以各地采用的方法也不可能一致。
The improvement and utilization of red soils is one of the important topics in current national scientific research. One of the ecological characteristics of red soil fertility is the fixed phosphorus. Currently, chemical methods for determination of available phosphorus in soil have been widely used to explore the supply capacity of soil phosphorus and provide scientific basis for the application of phosphate fertilizer to crops. Abroad, determination of available phosphorus in soil as many as (?), But the scope of application of various methods is limited, different soil should be used in different leaching agents, so the method used everywhere may not be consistent.