一、品种退化过程 二年生白花草木樨,从1952年引进陕北地区试种,1953年重点示范推广,1955～1956年大面积投入生产。通过试种、示范、推广,从生长情况看,二年生白花草木樨抗逆性强,生长快,产草量高,肥地增产作用大,植被度好,为本区解决“三料”(肥、燃、饲)问题、发展农牧业生产,保持水土的优良豆科牧草。 First, the process of species degradation Two-year-old white flowers clogs, from the introduction of northern Shaanxi in 1952 trial planting, 1953 key demonstration and promotion, 1955 ~ 1956 a large area into production. By trial planting, demonstration, promotion, from the growth of the situation, perennial Pak Hom stockade strong resistance, fast growth, high yield, fertilizer to increase production, good vegetation, the region to solve the “three” (fat , Burning, feeding) issues, the development of agriculture and animal husbandry production, to maintain soil and water quality legumes.