@book{16950,
	author = {American Society of Agronomy. ASA. },
	title = {Soil testing :},
	publisher = {American Society of Agronomy :},
	year = {1977[reimp.1984]},
	series = {ASA special publication ;},
	address = {Madison, WI :},
	note = {Proceedings of a symposium  .}
}