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Abstract An improved universal soil extracting solution prepared by adding DTPA to Morgan's solution is presented. As with the Morgan's solution, it is possible to determine all important elements except sodium in a single extract but with better correlations of extracted trace elements with plant growth. Methods for determination of important elements are given along with suggested treatments to change undesirable levels of elements to favorable ones. Maximum value is obtained from use of the extracting solution by determination of soluble N along with other elements in soil samples collected frequently from same crop.
Benjamin Wolf (Fri,) studied this question.