4Lai J P, He X W,Jiang Y, et al. Preparative separation and determination of matrine from the Chinese medicinal plant Sophora flavescens Ait by molecularly imprinted solid phase extraction[J]. Anal Bioanal Chem, 2003,375 (2) : 264.
5Andrews C J, Pomeroy M K. Changes in cold hardiness of over-wintering wheat[J]. C J Plant Sci, 1974,54: 9- 15.
6Downes R W. New herbage cuhivars Medicago satire cv. alfalfa[J]. Tropical Grasslands, 1994,28: 191-192.
