Acta Agrestia Sinica
Alfalfa Production Status and Way of Improvement in the Hilly South of NingXia Autonomous Region
CHENG Hong, DU Feng, ZHAO Ke-xue, MU Xing-min
. 2002, (3): 231 -236 .  DOI: 10.11733/j.issn.1007-0435.2002.03.016