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 Okruszko, H. Articles by Warren, G. F. Search for Related Content PubMed Articles by Okruszko, H. Articles by Warren, G. F. Agricola Articles by Okruszko, H. Articles by Warren, G. F.

Evaluation of Laboratory Tests on Organic Soils for Prediction of Phosphorus Availability¹

ABSTRACT

Nineteen muck and peat soils from northern Indiana were subjected to different laboratory analyses in an effort to determine what criterion might allow prediction of percentage yield that would be obtained with respect to P fertilization. Percentage yield of ladino clover was related to log of P in extracts of 0.5N HCl, 0.002N H₂SO₄, 0.5N acetic acid, and H₂O in the order r = 0.867, 0.732, 0.786, and 0.887, respectively.

The use of ratios of cations to P in the HCl extract increased the r values for the relationship between yields and predictive factors to r = -0.919 for the Fe + Al/P ratio and yield relationship.

When P in HCl extract, P in H₂SO₄ extract, Ca/P ratio, and Fe/P ratio in HCl extract were combined in their relationship to percentage yield, R = 0.948 was obtained. From the data obtained a table was set up with cation/P ratios corresponding to P fertility level of muck soil.

¹ Journal Paper No. 1699, Purdue University, Agr. Exp. Sta., Lafayette, Ind.

² Rockefeller Foundation Fellow, Assistant Professor, and Professor of Horticulture, respectively. Senior author is now Head of Department of Reclamation Institute, Nowogradzka 50, IMUZ, Warsaw, Poland. The authors express appreciation to Clare Harris for collection of the soils used in this experiment.

Received for publication January 11, 1961. Accepted for publication May 10, 1961.