@book{95924,
	author = {Bartholomew, W.V.},
	title = {Soil nitrogen; supply processes and crop requirements.},
	publisher = {NTIS, U.S. Dept. of Commerce},
	year = {1972},
	series = {U.S.Department of Commerce, NTIS; Technical Bulletin; no.6},
	address = {Spring field}
}