engleski

Variation of liming recommendation caused by calculation approach

Acid soils are widespread in the Eastern Croatia with acidity as limiting factor of the field crops yield. The widely accepted ameliorative measure for acid soils is liming with goal to increase soil pH. The liming recommendations are based on different soil properties and therefore the calculation could differ according to available and used soil data. The acid soils are sampled on a hundred different sites in Eastern Croatia and analyzed: pH (H2O), pH(KCl), Hy and CEC. The bases saturation of CEC were calculated, as well as liming recommendations using target soil pH or target BS as a base of calculation. The maximum difference caused by calculation approach for target BS = 80 (or pH = 6, 0) was 4, 36 t ha-1 (30% of higher recommendation), minimum difference 0, 08 and in average for 100 samples 1, 53 t ha-1. For target BS = 90 (or pH = 6, 5) all the recommendations were higher than previous one, but the differences were lower (maximum 2, 18 t ha-1, minimum 0, 04 and in average 0, 76 t ha-1). Comparison of two approach of calculating liming recommendation lead to conclusion that the differences (what means possible errors) are higher when the target pH or BS is lower.

hydrolitic acidity ; pH ; cation exchange capacity ; soil acidity

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