Phytotoxic Substances Extracted from Soil
1966
Guenzi, W. D. | McCalla, T. M.
Phytotoxic substances were extracted from soil with 0.1m Na₄P₂O₇ and acetone. The ether-soluble substances from the pyrophosphate extract were separated into acidic, neutral, and basic fractions. Acidic materials exhibited the highest phytotoxicity, followed by basic materials and then by the neutral fraction. The acetone extract of soil was fractionated on an alumina column using a solvent elution series. A number of compounds were isolated by paper chromatography and the majority of these substances were either ninhydrin-positive or acidic. Three phenolic acids were isolated and identified as vanillic, p-hydroxybenzoic, and protocatechuic. Ferulic, p-coumaric, p-hydroxybenzoic, vanillic, and syringic acids were extracted with 2n NaOH from plowed and subtilled soil. Larger amounts of ferulic and p-coumaric acids were found in subtilled soil as compared with the plowed soil. Only traces of these phenolic acids were found with 0.1m sodium pyrophosphate, calcium oxide, 2n HCl, and methanol extracts of soil.
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