Effect of nitrogen fertilization on yield, N content, and nitrogen fixation of alfalfa and smooth bromegrass grown alone or in mixture in greenhouse pots

by Kai-yun XIE, Xiang-lin LI, Feng HE, Ying-jun ZHANG, Li-qiang WAN, B Hannaway David, Dong WANG, Yan QIN, M A Fadul Gamal
Published 2015-09-01