一、前言 在常规的土壤磷肥力测定工作中,我们多半还是应用化学试剂提取测定法的。但是土壤速效磷的化学提取问题比较复杂。不但要根据土壤化学的原理来考虑选用方法,还需要对提取方法进行细致的相关研究,才能最后作出决定。对提取测定值的应用同样是复杂的。即使简单地以“高”、“中”、“低”来分档,不同提取方法的结果分起档来其数值相差很远;而且同一提取方法的结果对不同土壤,不同作物还应该有不同的分档标准。这就需要进细致的校验研究。决不能笼统地定出一套标准,在不同方法、不同土壤与作物的情况下统一使用。 土壤速效磷化学提取法的发展溯源很早。例如Dyer于1894年就提出的1％柠檬的提取法,目前并未完全淘汰。Troug于1930年提出0.02NH_2SO_4提取法,Morgan于1932提出的HOAc- First, the preface In the conventional determination of soil phosphorus fertility, we still use chemical reagent extraction assay. However, the problem of chemical extraction of available phosphorus in soil is rather complicated. Not only according to the principle of soil chemistry to consider the selection method, but also the extraction method requires careful research, in order to make a final decision. The same applies to the extraction of the measured values. Even if you simply “high”, “medium”, “low” to file, the results of different extraction methods divided by the file its value far away; and the same extraction methods for different soil, different crops should have different Sub-file standard. This requires careful calibration studies. The criteria should not be set broadly and should be used uniformly under different methods, different soils and crops. The development of soil available phosphorus chemical extraction has a long history. For example, the 1% lemon extraction method proposed by Dyer in 1894 has not been completely eliminated. Troug put forward 0.02NH_2SO_4 extraction method in 1930, Morgan in 1932 proposed HOAc-