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土壤中磷盐的存在状态如何,很大程度上决定了它对植物的有效度.有人把土壤中磷盐的储存总量和有效部分分别称为容量因素和强度因素.晚近几十年来,土壤中磷盐的有效度及其提高问题成为许多研究者的课题,并且提出了许多生物和化学抽提的方法来测定土壤中原有的和施用的磷盐的有效度,均收到良好的效果并日臻完善.1907年俄国的Butkewtach认为用黑麯菌(Aspergillus niger)能有效地测定土壤中
The presence of phosphorus salts in soils largely determines their effectiveness on plants, and some refer to the total and effective portion of stored phosphorus salts in soils as the capacity and strength factors, respectively The effectiveness of the medium phosphonium salts and their raising problems have been the subject of many investigators and many biological and chemical extraction methods have been proposed to determine the effectiveness of the original and applied phosphonium salts in the soil and have received good results In 1907, Butkewtach in Russia thought that Aspergillus niger could effectively measure soil