@article {721,
	title = {A long-term nitrogen fertilizer gradient has little effect on soil organic matter in a high-intensity maize production system},
	journal = {Global change biology},
	volume = {20},
	year = {2014},
	pages = {1339-1350},
	isbn = {1365-2486},
	author = {Brown, Kimberly H and Bach, Elizabeth M and Drijber, Rhae A and Hofmockel, Kirsten S. and Jeske, Elizabeth S and Sawyer, John E and Castellano, Michael J}
}
