Sirous Shakeri - Department of Agriculture, Payame Noor University, Tehran, I. R. Iran
abolfazl azadi - Department of Soil and Water Research, Khuzestan Agricultural and Natural Resources Research and Education Center, AREEO, Ahvaz, I. R. Iran
Mahboub Saffari - Department of Environments, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, I. R. Iran

Phosphorus (P) is a nutrient essential for plant, which its availability in soils changes with aging process, leaching, precipitation processes, and the landform change. There is limited information available on kinetics release of P in calcareous soils. Therefore, the purpose of this study was to investigate distribution of P and the effect of physicochemical properties and clay minerals on its release in some dominant orders of the calcareous soils in Kohgiluyeh-and-Boyer-Ahmad province, using the ۰.۰۱ M calcium chloride ( ) extractant. The results showed that the P released rapidly from the soil and continued slowly. After ۷۲ h, the amount of P released in the studied soils ranged between ۳.۲ and ۲۵.۴ mg kg-۱. Evaluation of the fitted different equations on P released in the studied soils revealed that the Simple Elovich and power function equations could well predict the P release process in the studied soils. The results of the correlation between soil properties and released P contents showed that P release coefficients (including the slope and intercept in the Simple Elovich equation) have a significant negative relationship with the amount of smectite and vermiculite minerals. Also, the release coefficient of the parabolic diffusion equation had a significant negative relationship with pH and the amount of illite and palygorskite minerals.

Calcareous soils, Clay minerals, Phosphorus release