Alfalfa (Medicago sativa L.), a prominent perennial forage in the legume family ... At the bud stage, 3~5 sterile buds and branches of the upper inflorescence of the maintainer buds were randomly ...

1 Branch of Animal Husbandry and Veterinary of Heilongjiang Academy of Agricultural Sciences, Qiqihar, Heilongjiang, China 2 Institute of Grass Science of Heilongjiang Academy of Agricultural Sciences ...