Sukunya Yampracha. (2006) Dissolution and availability of rock phosphates for rice cultivation in acid sulfate soils of Thailand /. Kasetsart University,:ม.ป.ท.Sukunya Yampracha. 2006. Dissolution and availability of rock phosphates for rice cultivation in acid sulfate soils of Thailand /. ม.ป.ท.:Kasetsart University,;Sukunya Yampracha. Dissolution and availability of rock phosphates for rice cultivation in acid sulfate soils of Thailand /. ม.ป.ท.:Kasetsart University, 2006. Print.