@book{2888,
	author = {Sparks, Donald L., and American Society of Agronomy.},
	title = {Advances in agronomy /},
	publisher = {Academic Press,},
	year = {c1995},
	series = {Advances in agronomy,},
	address = {San Diego :},
	url = {http://www.columbia.edu/cgi-bin/cul/resolve?clio10828860}
}