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Evaluation of tests for predicting the availability of soil manganese to plants

Published online by Cambridge University Press:  27 March 2009

M. G. Browman
Affiliation:
Soils Department, University of Wisconsin, Madison, Wisconsin, 53706, U.S.A.
G. Chesters
Affiliation:
Soils Department, University of Wisconsin, Madison, Wisconsin, 53706, U.S.A.
H. B. Pionke
Affiliation:
Soils Department, University of Wisconsin, Madison, Wisconsin, 53706, U.S.A.

Summary

Eight soil Mn tests, namely, CH3COONH4-, Mg(NO3)2-, H3PO4-, hydroquinone-, 3m-NH4H2PO4-,1·5m-NH4H2PO4- and EDTA-extractable Mn and total Mn were evaluated for their ability to predict Mn uptake by maize (Zea mays L.) on 63 soils of diverse origin. Regression equations were derived by comparing Mn uptake with each test in combination with pH. The best prediction of Mn uptake was provided by a combination of CH3COONH4-extractable Mn and pH; 52·9 % of the variability in Mn uptake was accounted for by these two variables. EDTA and H3PO4-extractable Mn were superior to the other soil Mn tests in predicting Mn uptake.

The effect of soil properties on the extractability of soil Mn by each extractant was analysed statistically. Only with hydroquinone-extractable Mn did the soil variables investigated account for a major portion of the variability in the Mn test. The soil variables most often correlated significantly with the Mn test were pH and total Mn. Organic carbon and clay contents were significant only in determining EDTA- and Mg(NO3)2-extractable Mn, respectively.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1969

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