THE EXTRACTION OF SOIL PHYTOTOXINS USING A NEUTRAL EDTA SOLUTION

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Abstract
A new technique for extracting potential phytotoxic materials from soils is presented and discussed. This technique features the use of water and a chelating agent (Na2EDTA at pH 7.5) as the primary levers of extraction, and, therefore, avoids the use of denaturing alkaline conditions. Stress is placed on extraction mechanisms that accord with the natural circumstances governing the basic ecology of plant and soil systems. Thsu, availability, with respect to the uptake of organic soil compounds by plants, is discussed, as is a recommendation for sampling soil at the time these compounds are introduced. The application of the above to the study of allelopathy is discussed.