6Barnes D K,Smith D M,Strucker R E,et al.Fall dormancy in alfalfa:a valuable predictive tool[A].Agricultural Reviews and Manuals,Science and Education Administration[C].Washington D C:U.S.Gov.print.office,1979:34.
7Oakley R A,Westover H L.Effect of the length of day on seedlings alfalfa varieties and possibility of utilizing this as a means of identification[J].J.Agr.Res,1921,21:599-608.
8Knipe B,Reisen P,McCaslin M.The importance of fall dormancy to yield,persistence and forage quality[C].California:Proceedings of the 1997 California Alfalfa Symposium,1997:192-197.
