مشخصات پژوهش

عنوان	Minerals control phosphorus solubility in long-termcultivated calcareous soils
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	environmental pollution, ion activity, phosphate minerals, saturation index, speciation
چکیده	Little information is available on phosphorus (P) solubility in long-term cultivated calcareous soils. Improved characterisation of P-containing minerals and soil P species in calcareous soils leads to better management of crop production, water quality and soil quality. In this study, we investigated the solubility relationships of P for 20 surface-soil samples from Hamedan, western Iran, with a wide range of physical and chemical properties. Two equilibration times (0.5 and 168 h) were used to evaluate the effect of equilibration times on P activities. We observed up to 67% decrease in mean P concentration when equilibration time was increased from 0.5 to 168 h. Solubility diagrams support the stability of hydroxyapatite with 0.5 h equilibration and hydroxyapatite and b-tricalcium phosphate with 168 h equilibration. Geochemical modelling predicted that dicalcium phosphate, dicalcium phosphate dihydrate and magnesium-P minerals would be unstable and thus would gradually dissolve and supply P in solution in these calcareous soils. The information obtained can be used to predict the behaviour of P and its availability for agricultural crops in calcareous soils.
پژوهشگران	محسن جلالی (نفر اول)، مهدی جلالی (نفر دوم)