1Testa G, Gresta F, Cosentino S L. Dry matter and qualitative characteristics of alfalfa as affected by harvest times and soil water content [J]. European Journal of Agronomy, 2011, 34(3): 144-52.
2Gallego A, Hospido A, Moreira M T, et al. Environmental assessment of dehydrated alfalfa production in Spain [J]. Resources, Conservation and Recycling, 2011, 55(11): 1005- 1012.
3JIA Y, LI F M, ZHANG Z H, et al. Productivity and water use of alfalfa and subsequent crops in the semiarid Loess Plateau with different stand ages of alfalfa and crop sequences [J]. Field Crops Research, 2009, 114(1): 58-65.