No. 1 (2001): Special Issue - Journal of Agricultural Sciences
Articles

Preliminary Critical P-limit Values of 0.01 M CaCl2 Soil Test Procedure

Published December 4, 2001
István Jászberényi
University of Debrecen, Centre of Agricultural Sciences, Faculty of Agricultural Sciences, Department of Agricultural Chemistry, Debrecen
Jakab Loch
University of Debrecen, Centre of Agricultural Sciences, Faculty of Agricultural Sciences, Department of Agricultural Chemistry, Debrecen
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APA

Jászberényi, I., & Loch, J. (2001). Preliminary Critical P-limit Values of 0.01 M CaCl2 Soil Test Procedure. Acta Agraria Debreceniensis, (1), 18–21. https://doi.org/10.34101/actaagrar/1/3602

In the last decade, the 0.01 M CaCl2 extraction procedure was tested as a multi-nutrient extractant. In 1995-97, international joint research activities were carried out within the COPERNICUS project. Detailed calibration of conventional and the 0.01 M CaCl2 extraction procedures for pH, Mg and K were published.
The amount of phosphorus extracted using a 0.01 M CaCl2 solution is very low and reflects the intensity parameter of phosphorus bio-availability. As a readily desorbed P fraction of soils can reflect the soil P-supply and the CaCl2-P values are in close correlation with P-fertiliser rates and P balance. However, the effects of various soil characteristics on CaCl2-P values are different and their interpretation is difficult.
Relatively poor correlations were found between amounts of P extracted by conventional and CaCl2 soil test methods and, therefore, P limit values could not be calculated directly. To characterise the soil P supply at different sites, the CaCl2 desorbed P and the adsorbed P in a modified Baker Soil Test were also applied.
Soil test results of Hungarian long-term fertiliser experiments and recommended CaCl2-P limit values, calculated on yield effects and soil characteristics, are discussed.

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