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 HighWire Citing Articles via Google Scholar Google Scholar Articles by Sadusky, M. C. Articles by Hendricks, G. J. Search for Related Content PubMed Articles by Sadusky, M. C. Articles by Hendricks, G. J. Agricola Articles by Sadusky, M. C. Articles by Hendricks, G. J.

Kinetics and Mechanisms of Potassium Release from Sandy Middle Atlantic Coastal Plain Soils¹

ABSTRACT

Kinetics of K release were investigated on a Kenansville loamy sand (loamy, siliceous, thermic Arenic Hapludults), a Rumford loamy sand (coarse-loamy, siliceous, thermic Typic Hapludults), and a Sassafras fine sandy loam (fine-loamy, mixed, mesic Typic Hapludults) from the Delaware Coastal Plain. Previous field experiments had shown that corn (Zea mays L.) grown on these soils did not respond to K applications. The soils contained high levels of total K ranging from 22.5 to 46.5 cmol kg^–1. Most of the total K was in the mineral form, particularly feldspars, and was contained in the sand fractions of the soils. Kinetics of K release from the whole soils and from the coarse, medium, and fine sand fractions were studied using a H-saturated resin and 0.01 M oxalic acid. Potassium release from the whole soils, using the resin, ranged from 0.172 to 0.251 cmol kg^–1 over a 30-d period, and significantly more K was released with the resin than with oxalic acid. The K release that occurred from the sand fractions was attributed to the highly weathered nature of the K-feldspars in these soils as observed by electron microbeam analyses. The mechanism of K release from the soil feldspars appears to be a surface-controlled reaction.

¹ Published with the approval of the Director of the Delaware Agric. Exp. Stn. as Miscellaneous Paper no. 1176. Contribution no. 219 of the Dep. of Plant Science, Univ. of Delaware, Newark, DE 19717-1303.

² University Graduate Research Scholar and 1986 Potash and Phosphate Institute Fellow, Professor of Soil Chemistry, Graduate Research Assistant, and Research Associate I, respectively.

Received for publication February 6, 1987.

This article has been cited by other articles:

				W. Nilawonk, T. Attanandana, A. Phonphoem, R. Yost, and X. Shuai Potassium Release in Representative Maize-Producing Soils of Thailand Soil Sci. Soc. Am. J., May 1, 2008; 72(3): 791 - 797. [Abstract] [Full Text] [PDF]

				R. J. M. Fitzpatrick and K. Guillard Kentucky Bluegrass Response to Potassium and Nitrogen Fertilization Crop Sci., September 1, 2004; 44(5): 1721 - 1728. [Abstract] [Full Text] [PDF]