Three steps of P and K fertilization (500, 1000 and 1500 kg/ha, either/or P2O5 and K2O and their second-step combination) were applied on acid soil. The highest yields were found by PK-treatment (yield increases compared to control; 12% +30% + 8% + 18% , for maize-soybean-maize-wheat rotation). P fertilization significantly influenced on soil P ( + 145% ) , Ca ( +58% ) , Sr ( +53% ) and Cd ( +12% ). K fertilization resulted in significant increases of soil K ( +77% ) and decreases of soil Cu (-17%), and Na (-54%). However, Mg, S, Fe, Mn, Zn, Mo, Cr, Ni, Al, B, Ba, Co and Pb status were independent of the fertilization.
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