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Use of Discriminant Analysis for Classification of Fertilizer-Responsive Sites¹

ABSTRACT

The use of soil-extractable phosphorus (P) was evaluated as a means for classifying P-deficient soils. Two P extractants, ammonium acetate (pH 4.8) and double acid (Melich I), were employed as guides to P-deficient soils. Surface soil-extractable P was not useful for determining a P-deficient site; however, either extractant, when used to a total depth of 60 cm, produced acceptable discriminatory power. The depth of soil sampling was as important or more important than the extraction used. Measurements of rooting depth such as drainage class and depth to a spodic horizon, argillic horizon, or mottles were useful variables for diagnosing nutrient-deficient sites when combined with extractable P. The use of discriminant analysis in predicting fertilizer response is discussed.

¹ Florida Agric. Exp. Stn. Journal Series no. 3663.

² Assistant Professor and Professor, respectively, Soil Science Dep. and School of Forestry and Resource Conservation, Univ. of Florida, Gainesville, FL 32611.

Received for publication February 3, 1982. Accepted for publication April 29, 1982.