[Determining parameters of potassium availability in chernozem, humic-grey and pseudogley [Yugoslavia]]
1984
Vukadinovic, V. (Poljoprivredni fakultet, Osijek (Yugoslavia)) | Rados, A. | Amic, D.
Accessibility of potassium in 3 types of soil in Slavonia, SR Croatia (SFRY), chernozem, boggy humus and pseudogley, was investigated, The investigation was performed in a laboratory. On the basis of the obtained results the following conclusions were drawn: 1)The investigated soils differ in the quantity of available Ca and Mg, in accordance with pH reaction, while the difference in potassium quality is less notable. 2)The ratio of the quantity (Q) Ca and intensity (1)Ca and QMg/IMg in the soil unfertilized with potassium in the lowest in chernozem, moderate in the boggy humus and the highest in pseudogley, and this is also the order of the decrease of Ca and Mg accessibility. 3)With increased fertilization with potassium, QK/IK is narrowed in all 3 types of soil, i.e. accessibility of potassium increases with the slightest change in pseudogley. The QK/IK curves have a potency shape for all 3 types of soil, and the slightest inclination is in pseudogley. 4)Boggy humus has the highest buffer ability for potassium, chernozem has a moderate one and pseudogley the lowest one. 5)Fertilization with potassium has a weak influence on the change of Ca and Mg quantity, but a much stronger one on the increase of their intensity, which is reflected in a sharp inclination of the curve in the graphic representation of intensity, compared with the quantity of Ca and Mg. 6)Change in the Q/I ratio of Ca and Mg with increased fertilization with potassium influenced notably the change of Q/I of potassium, when QCa/ICa has a negative, and QMg/IMg a positive influence. 7)Extraction of Cl-by water is the most complete from pseudogley and somewhat lower from boggy humus and chernozem.
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