an annual plant(cyamopsis tetragonolobus) probably native to india, adapted to semiarid regions and grown as a forage crop and for its seeds, from which guar gum is obtained.
to separate cereal crop from forage crop and build a cropping system of cereal cash forage three units structure is an inevitable choice of solving grain problem in the loess plateau.
alfalfa(medicago sativd) plays an important role in ecological construction and adjustment of agricultural structure, which is a major forage crop with well-behaving characteristics in the world.