Abstract
A greenhouse study compared the effect of soil P-fixing capacity on the relative argonomic effectiveness (RAE) of partially acidulated phosphate rock (PAPR) and water-soluble P. Such information is lacking in the literature. Six soils varying widely in P-fixing capacity (5.6%–56.1%) were used. A phosphate rock (Huila PR) from Colombia was acidulated with H2SO4 at 50% of the level necessary to achieve full conversion to single superphosphate (SSP). Rates of P applied from PAPR or SSP were 0,05, 100, and 300 mg P kg−1. The P fertilizers were mixed with the soils, and maize was grown for 6 weeks before harvest.
The results show that the effectiveness of PAPR in increasing dry-matter yield and P uptake over yield and uptake obtained with SSP linearly increased as the soil P-fixing capacity increased. PAPR and SSP were equally effective in increasing dry-matter yield or P uptake at P-fixing capacities of 28% or 36%, respectively. PAPR was found to be more effective than SSP in soils (treated with Fe-gel) with P-fixing capacity higher than these values. The internal efficiency, which is defined as the ratio between dry-matter yield and P uptake, was the same for both PAPR and SSP in all the soils.
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Chien, S.H., Hammond, L.L. Agronomic effectiveness of partially acidulated phosphate rock as influenced by soil phosphorus-fixing capacity. Plant Soil 120, 159–164 (1989). https://doi.org/10.1007/BF02377064
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DOI: https://doi.org/10.1007/BF02377064