@book{83464,
	author = { Sonitha N.},
	title = {Soil physico-chemical characteristics due to long term fertilization},
	publisher = {Govt. College},
	year = {2001},
	series = {A project report submitted to Kannur University in partial fulfillment of the requirement for the award of the degree of Master of Chemistry},
	address = {Kasaragod}
}