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Water-Soluble Chelating Agents in Organic Materials: II. Influence of Chelate-Containing Materials on the Availability of Trace Metals to Plants¹

ABSTRACT

Water extracts of barnyard manure, when added to nutrient solutions, greatly decreased the absorption of zinc and iron during a 72-hour absorption period. It was concluded that chelating agents held the zinc and iron in a form that was less available to plants than ionic forms and that the complexing agent did not increase the mobility of the metal within the plant. Additions of manure and a water extract of manure to a Brookston soil decreased the availability of zinc and copper in the soil, but increased the availability of manganese to the plants. It could not be determined from the data obtained whether or not the increased manganese availability could be attributed to the presence of the chelating agents in the extract.

¹ Journal Paper No. 1180. Purdue Univ. Agr. Exp. Sta., Lafayette, Ind. Contribution from the Dept. of Agronomy. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

² Formerly Research Assistant, presently Assistant Professor, Ontario Agr. College, and Associate Professor, respectively, Purdue Univ., Agronomy Dept.

Received for publication November 5, 1957. Accepted for publication February 25, 1958.