Influence of gypsum treatment on extractability of nutrients from soils
Matula, J.(Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic))E-mail:matula@vurv.cz | Pechova, M.
In an incubation experiment with 36 soils we tested the influence of CaSO4.2 H2O applied at the dose of 3.3 g per kg of soil on the extractability of some nutrients (P, K, Mg, Ca, Mn, B and S). After 134 days of incubation, the soils were extracted with water (1:5, w/v), 0.5M ammonium acetate with NH4F addition (pH 7) and by Mehlich 3 method. An ICP-technique was used for nutrient detection. Colorimetry on a SKALAR analyser was employed to determine phosphates and sulphates. After gypsum treatment, P concentration was markedly lower in the H2O extract, on average by 69% in ICP detection and by 58% in colorimetric detection of phosphates. A significant depression of P concentration was also measured in the acetate extract (11% in ICP detection, 14% in colorimetry). On the contrary, in Mehlich 3 extraction, P concentration was higher on average by 31% in ICP detection, whereas colorimetry detection did not show any significant differences.
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