@article {44863,
	title = {Response of aspen species to phophorus and sulfur applications in a gray luvisol. In : 40th Annual Alberta Soil Science Workshop Proceedings "Landforms influences on nutrient cycling", February 18-20, 2003, Edmonton, Alberta},
	year = {2003},
	pages = {103-108},
	institution = {Alberta Agriculture, Food and Rural Development, Agronomy Centre},
	author = {Liang, He and Chang, Scott}
}
