@book{14189,
	author = {Rajan, S. V. Govinda. and Rao, H. G. Gopala},
	title = {Soil and Crop Productivity : a handbook for the use of workers in agricultural extension, vocational agriculture and farmers in India / },
	publisher = {: Asia Publishing House},
	year = {, 1971},
	address = {.- Bombay}
}