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Abstract
The effectiveness of the application of raw (PR‐1), and partially acidulated phosphate rock (PR), at 25% (PR‐25) and at 50% (PR‐50), was investigated to reduce extractability and plant uptake of Pb, Cd, Cu, Ni, and Zn in three calciorthids soils.Furthermore, the effects of soil treatments on metal extractability were evaluated by sequential extraction. Similarly, such effects were assessed on the phytoavailability of metals of maize (Zea mays L.) through a pot experiment. Water‐soluble and exchangeable metal fractions (the bioavailable fractions) were influenced distinctively by PR treatments and soil properties. In addition, decrease of soluble and exchangeable metal fractions was compensated by an increase in metal extracted from other fractions. Most bioavailable soil metals correlated significantly with their associated level in plant tissue. Finally, plant metal uptake decreased with PR treatments, suggesting that PR application was likely to be effective in controlling metal immobilization in these soils.
Acknowledgment
The authors express their sincere gratitude to the National Council for Science and Technology (CONACyT) for providing partial funding for the research project. They are also grateful to the personnel of the Chemistry Division at the Colegio de Postgraduados, especially to A. Loaiza for the soil analysis and to Guadalupe Bazán for typing the manuscript. A special thanks go to Roberto Núñez‐E. for providing us with the phosphate rock.
