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 Voigt, G. K. Search for Related Content PubMed Articles by Voigt, G. K. Agricola Articles by Voigt, G. K.

Phosphorus Uptake in Young Pitch Pine (Pinus rigida Mill.)¹

ABSTRACT

Phosphorus sorbed by young pitch pines was related to water-soluble P, P extracted by 0.002 N H₂SO₄, by HOAc-NaOAc or by NH₄F-HCl in the rooting zones of these trees. Average annual P requirements were approximated by the three acid-extracting agents but water-soluble P in the root surface zone was considerably less than the annual uptake. Mean P concentration of the soil solution immediately adjacent to the root surface was estimated to be about 0.5 ppm. There appeared to be an interaction between P and Ca which resulted in reduced P uptake with increasing Ca concentration. Increased sorption of both P and Ca was associated with increased root surface. The results suggest that apatite or apatite-like compounds may have served as a source of P but attempts to verify presence of apatite in the soil were inconclusive.

¹ Contribution from the Yale School of Forestry, New Haven, Conn.

² Professor of Forest Soils. The support of the National Science Foundation (G23637) and the laboratory determinations by Dr. Sevim Zabunoglu, NATO Postdoctoral Fellow in Soils, are gratefully acknowledged.

Received for publication June 29, 1965. Accepted for publication January 14, 1966.