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 Williams, J. D. H. Articles by Walker, T. W. Search for Related Content PubMed Articles by Williams, J. D. H. Articles by Walker, T. W. Agricola Articles by Williams, J. D. H. Articles by Walker, T. W.

Fractionation of Soil Inorganic Phosphate by a Modification of Chang and Jackson's Procedure¹

ABSTRACT

A modified version of the phosphate fractionation procedure of Chang and Jackson (1957) included the determination of "residual inorg. P" and introduced a revised nomenclature for the other fractions. Added phosphate sorbed during the fluoride extraction was usually completely recovered in the succeeding sodium hydroxide extraction; this enabled mutually compensating corrections to be applied to NH₄F-P and 1st NaOH-P values. A second acid treatment increased the amount of Ca-P extracted. Further modifications simplified the colorimetric determinations of inorganic phosphate in several of the extracts. A measure of the reproducibility of fractionation results was also obtained.

¹ Contribution from the Dep. of Soil Sci., Lincoln College, Univ. of Canterbury, New Zealand. Supported in part by scholarships to the first two authors from the Commonwealth Scholarship and Fellowship Plan.

² Formerly Graduate Student now Scientific Officer, Rothamsted Exp. Sta., Harpenden, Herts., England; formerly Research Fellow now Project Associate, Univ. of Wisconsin; and Professor of Soil Science, respectively.

Received for publication May 24, 1967. Accepted for publication July 31, 1967.