@book{89412,
	title = {Cation activity ratios in equilibrium soil solutions and the uptake of potassium, calcium and magnesium /},
	publisher = {University Of Dhaka, },
	year = {1971.},
	address = {Dhaka : },
	note = {Thesis (MS )-- Department of Soil, Water & Environment, University of Dhaka,1970.}
}