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紫花苜蓿(Medicago sativa)和黄花苜蓿(M.falcata)是半湿润地区放牧场有价值的成分。有关苜蓿对干旱地区放牧场的畜牧生产和改良半干旱地区草原作用的文献还不是太多。Townsend 等(1975)认为苜蓿在美国密西西比河流域以西的大平原的干旱地区是最理想的豆科饲用植物之一。Herrey(1960)曾报导,在怀俄明州羔羊收益之所以增加,是由于在天然草地上播种了苜蓿和沙生冰草(Agropyron desertorum)的结果。干旱地区引入栽培的“Nomad”苜蓿,最成功的技术之一就是用于改良美国东南部
Medicago sativa and M. falcata are valuable ingredients for grazing in semi-humid areas. There is not much literature on the effects of alfalfa on livestock production in grazing areas in arid areas and on improving the role of grasslands in semi-arid areas. Townsend et al. (1975) considered alfalfa as one of the most ideal legume forage plants in the arid region of the Great Plains west of the Mississippi River in the United States. Herrey (1960) reported that lamb gains in Wyoming have been attributed to the results of planting alfalfa and Agropyron desertorum on natural grass. One of the most successful technologies to introduce cultivated “Nomad” alfalfa in arid regions is to improve the southeastern United States