9Moreira N. The effect of seed rate and nitrogen fertilizer on the yield nutritive value of oat-vetch mixture[J]. Journal of Agricultural Science, 1989, 112(1) :57-66.
10Kim D A. Comparative studies of introduced rye for spring forage production V. Cultivar and harvesting date effects on forage yield and quality[J].Journal of The Korean Society of Grassland Science, 1992, 12(1):26-32.