Acta Agrestia Sinica
Effects of Nitrogen Fertilizer and Planting Density on Alfalfa Growth and Seed Yield
LI Li, LI Ning, SHENG Jian-dong, WANG Hao
. 2012, (1): 54 -57,62 .  DOI: 10.11733/j.issn.1007-0435.2012.01.009