Studies on potassium supplying capacities of diffrent soils. II. Mehlich-3 extraction
2004
Pchelarova, Kh. (Institut po Pochvoznanie "N. Pushkarov", Sofia (Bulgaria))
Two soils with different properties in pot experiment with reygrass were used in the investigation. Six harvest were taken. Three extractants for predicting crop response to K-Mehlich-3, 0,01 M CaCl2 and acetate-lactate method (P. Ivanao) and the potassium uptake were compared using regression techniques. The results show that for both soil types it is possible to use 1-st order equation for regression analyses. There were no significant differences among the Mehlich-3 and 0,01 CaCl3 extracts. For the fluvisoil Mehlich-3 seems to be best among these three extractants for predicting crop response to K. Close correlation between Mehlich-3 and 0.01 M CaCL2 were also confirmed.
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