An improved universal extracting solution and its use for diagnosing soil fertility

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Abstract
An improved universal soil extracting solution prepared by adding DTPA [diethylenetriaminepentaacetic acid] to Morgan''s solution is presented. As with the Morgan''s solution, it is possible to determine all important elements except Na 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 the same crop.

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