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 Westin, F. C. Articles by Buntley, G. J. Search for Related Content PubMed Articles by Westin, F. C. Articles by Buntley, G. J. Agricola Articles by Westin, F. C. Articles by Buntley, G. J.

Soil Phosphorus in South Dakota: III. Phosphorus Fractions of Some Borolls and Ustolls¹

ABSTRACT

The data for the phosphorus fractions and carbon and nitrogen for 8 soils classified as Borolls and 8 as Ustolls along a 260-km transect are compared. The Ustolls generally have, in their upper horizons, appreciably more Fe-P, and reductant-P, less Ca-P, and slightly less Al-P than the Borolls. Organic P values are a little higher and carbon and nitrogen percentages are slightly lower among the Ustolls.

In general, the ratio of carbon to phosphorus in the organic matter is lower among the Ustolls indicating that there probably is a higher rate of mineralization of organic P taking place in the Ustolls than in the Borolls.

The proportions of the phosphorus fractions in the various horizons of the soils appear to reflect the climatic change occurring along the transect.

Key Words: organic phosphorus C/N/P ratios • Chernozem soils • Seventh Approximation

¹ Contribution from the Department of Agronomy, Agr. Exp. Sta., South Dakota State University, Brookings. Approved for publication by the Director of the South Dakota Agr. Exp. Sta. as Journal Series no. 750.

² Professor and Associate Professor of Agronomy, respectively, South Dakota State University, Brookings.

Received for publication November 2, 1966. Accepted for publication April 5, 1967.