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 Yang, J. E. Articles by Jacobsen, J. S. Search for Related Content PubMed Articles by Yang, J. E. Articles by Jacobsen, J. S. Agricola Articles by Yang, J. E. Articles by Jacobsen, J. S.

Soil Inorganic Phosphorus Fractions and Their Uptake Relationships in Calcareous Soils

Department of Plant and Soil Science, Montana State Univ., Bozeman, MT 59717

*Corresponding author.

ABSTRACT

Crop responses to recommended P-fertilizer applications are erratic in high pH, calcareous soils of Montana. The objective of this research was to evaluate relationships between soil inorganic P (P₁) fractions, Olsen-P, and plant uptake. Soil-incubation and plant-growth experiments were conducted on samples of six calcareous soils from P-responsive locations in Montana. Rates of P were 0, 11, 22, and 33 mg P kg^–1 applied to soils in a randomized complete-block design with four replications. Spring wheat (Triticum aestivum L. cv. Newana) was grown successively during three, 4-wk growing periods. Fertilized soils were incubated without plants during the same period. Soils were subjected to a sequential-fractionation procedure (resin-P, NaHCO₃-P, NaOH-P, and HCl-P). Soil P₁ quantities were HCl-P > NaOH-P > NaHCO₃-P (bic-P) > resin-P. Higher Olsen-P soils had higher summation of P₁ fractions than lower Olsen-P soils. Changes in resin-P accounted for most of P₁-fraction differences induced by P application and plant uptake. Cropped soils generally contained lower amounts of P₁ in each fraction than noncropped soils. Highly significant (P > 0.01) correlations were found for Olsen-P vs. resin-P, P uptake vs. resin-P, and P uptake vs. Olsen-P, but not for Olsen-P vs. bic-P, resin-P vs. bic-P, and P uptake vs. bic-P. Resin-P was the best indicator of P-uptake responses on these soils to P applications and should be considered in the prediction of crop responses.

Contribution no. J-2387 from Montana Agric. Exp. Stn. and Extension Service.

Received for publication August 25, 1989.