Abstract
Abstract Phosphogypsum (PG), the by‐product of wet acid production of phosphoric acid from rock phosphate, is much more widely distributed than natural rock phosphate deposits. It is a major source of S and Ca for crops. It was found to be effective as a soil conditioner for sodic, solonets, and solonetzic soils and as an ameliorant for Al toxicity and subsoil acidity. In addition, it was found to be effective in promoting aggregation in hard‐setting clays and in subsoil hardpans. Unlike mine gypsum, PG contains impurities whose release into the soil and ground water need to be monitored. The results of this study show that use of solubility curves can be an effective method to characterize the solubility rates and solubility characteristics of PG and its constituents. Percentages of the total content of each element studied, namely: Ca, P, Al, Fe, Zn, Cu, and Mn, dissolved in Mehlich I solution were significantly correlated with the percent of PG dissolved. The solubility curves of Ca, P, and F in water followed closely that of PG, but the correlations coefficients (r) were not significant due to lack of spread of the individual values.
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