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EXTRACTION METHODS AND POTASSIUM AVAILABILITY FOR SOYBEAN IN THE PARANA STATE’S SOILS, BRAZIL  [2015]

Fábio Steiner Maria do Carmo Lana Tiago Zoz Jucenei Fernando Frandoloso et al.

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Abstract
Evaluating the potassium (K) availability to the plants can be performed by different methods. In general, methods are employed and they are for K due to increase operational soil testing laboratory. The efficacy of ammonium acetate, Mehlich-1, Mehlich-3 and ion exchange resin soil K extractants in determining the K availability for soybean, in different Parana soils, were investigated in this study. Twelve soil samples, collected from the& upper layer 0ndash;0.20 m, were cultivated with soybean forv42 days in greenhouse conditions. The average amount of available soil K extracted in test soils was found, displayed in decreasing order: ammonium acetate Mehlich-3 Mehlich-1 = ion exchange resin. The correlation coefficients between the K extracted content by ammonium acetate, Mehlich -1, Mehlich-3 and ion exchange resin and the K accumulated amount in the plants were, respectively, 0. 90, 0.77, 0.88 and 0.89 . The efficacy of ammonium acetate, Mehlich-3 and ion exchange resin extractants in assessing plant-available K in soils from Parana State were similar. The Mehlich-1 was the least efficient in estimating plant-available K in Parana
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Revista de Agricultura Neotropical