@book{43451,
	author = {Sarker, S. M. Nurul Islam},
	title = {Determination of critical limits of Potassium for wheat, potato and groundnut in some soils of Bangladesh /},
	publisher = {University of Dhaka, },
	year = {1997.},
	address = {Dhaka :},
	note = {Thesis (PhD )--Department of Soil, Water & Environment, University of Dhaka, Session : 1997.}
}