HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Hoff, D. J. Articles by Mederski, H. J. Search for Related Content PubMed Articles by Hoff, D. J. Articles by Mederski, H. J. Agricola Articles by Hoff, D. J. Articles by Mederski, H. J.

The Chemical Estimation of Plant Available Soil Manganese¹

ABSTRACT

Nine methods of extracting manganese from 25 soils were studied and correlated with manganese absorbed by soybean plants. Two of the methods, extraction with 0.1N H₃PO₄ and 3N NH₄H₂PO₄ for 1 hour at a 1:10 soil/solution ratio, were developed during the investigation.

Of the nine methods investigated, extraction of soil manganese with NH₄H₂PO₄, alcoholic hydroquinone, and H₃PO₄ yielded the highest correlation coefficients (0.856 to 0.899), had the smallest variances, and as a group were statistically different from extraction with NH₄OAc, NaOAc, and total soil manganese as methods of estimating plant available manganese. The ammonium dihydrogen phosphate extraction method with the highest correlation coefficient (0.899) was statistically different from methods of extracting soil manganese with H₂SO₄, hydroquinone in NH₄OAc, HNO₃, NH₄OAc, NaOAc, and total soil manganese.

Results indicate that manganese deficiency in soybeans may be expected if the manganese extracted with ammonium dihydrogen phosphate or phosphoric acid is less than 40 pp2m. With alcoholic hydroquinone, manganese deficiency may be expected if the manganese extracted is less than 125 pp2m.

¹ Contribution from the Department of Agronomy, Ohio State University and Ohio Agr. Exp. Sta. Part of a dissertation submitted, by the senior author, in partial fulfillment of the requirements for the Ph.D. degree at Ohio State University and presented before Div. IV, Soil Science Society of America, Cincinnati, Ohio, Nov. 13, 1956.

² Formerly Graduate Assistant in Agronomy, Ohio State University and Ohio Agr. Exp. Sta., now Assistant Professor, Ohio State University and Ohio Agr. Exp. Sta.; and Associate Professor, Ohio Agr. Exp. Sta., respectively.

Received for publication August 5, 1957. Accepted for publication November 26, 1957.