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The dissolution of phosphate rock (PR) was studied in the presence and absence of plants grown in an acid mineral substrate (alumina sand) that simulates an acidic, P-fixing soil. This substrate being devoid of P and Ca, PR was the only source of both P and Ca for the plants. In the absence of plants, the low pH of the substrate (pH about 4) resulted in dissolution of about 8 and 30% of the applied...
Based on the complex of ecological soil parameters (E h and pH values, K + , Ca 2+ , NO 3− activity in soil liquid phase (SLP) measured in situ with ion-selective electrodes) an attempt is made to assess changes in these parameters in different soils in agrocenoses (agricultural ecosystems) from their pristine analogues and to find the direction of the recent processes...
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