不同科、甚至同一科的牧草颇难于一起并存。例如白三叶,当其一旦在草地上定植,便发育出强大的根系,迅速向土壤深层伸展,大量摄取养分。当禾草与白三叶混播时,因前者的根系大多在土壤表层。因而,其养分摄入量就显得不足。在白三叶和禾草长势优劣悬殊时,牧民势必 Different families, or even the same family forage quite difficult to co-exist. For example, white clover, when it is planted in the grass, it developed a powerful root system, quickly extended to the soil, a large intake of nutrients. When grass and white clover mixed, because the former most of the roots in the soil surface. Therefore, its nutrient intake is insufficient. In the white clover and grass growth strengths and weaknesses, herdsman is bound to