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ABSTRACT
The use of insoluble soil-chelated Mn, in addition to exchangeable Mn, did not increase the predictability of available Mn. In this study, 12 Indiana soils varying in organic matter, pH, texture, and parent material were collected and treated to give two levels of Mn and acidity. Available Mn was determined by cropping the soils with German Millet.
Exchangeable Mn was the most important factor in determining available Mn. Since chelated and exchangeable Mn were highly correlated, the true effect of chelated Mn may not have been apparent. Inclusion of the interaction chelated Mn times percent organic matter highly significantly increased the ability to predict available Mn. Soil pH was also significant in predicting available Mn.
The increase in chelated and exchangeable Mn on airdrying of the soils was related to total soil Mn.
1 Journal Paper No. 1555, Purdue University Agr. Exp. Sta., Lafayette, Ind. Contribution from the Dept. of Agronomy. Part of a thesis submitted in partial fulfillment of the requirements for the M.S. degree by the senior author. Presented before Div. IV, Soil Science Society of America, Cincinnati, Ohio, Nov. 16, 1959.
2 Graduate Assistant in Agronomy and Professor of Agronomy, respectively, Purdue University.
Received for publication December 30, 1959. Accepted for publication July 8, 1960.
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