Phosphorus was extracted from the five major types of Cyprus soils, ranging in CaCO3 content from 0 to 71%, using the Pw and the bicarbonate method. With three of these soils the two methods gave identical index values. However, bicarbonate extracted more P from the highly calcareous soil and less P from the igneous soil relative to the Pw method.
Reproducibility of both methods was found satisfactory.
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Orphanos, P.I. Extraction of phosphorus from the major soils of Cyprus with water or bicarbonate. Plant Soil 49, 417–420 (1978). https://doi.org/10.1007/BF02149749
- Plant Physiology