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Published in Soil Sci Soc Am J 26:71-74 (1962)
© 1962 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of Laboratory Tests on Organic Soils for Prediction of Phosphorus Availability1

Henryk Okruszko, G. E. Wilcox and G. F. Warren2

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.

NOTES

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.






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