本文所讨论的牧场上应用的优良牧草是看它在价格合理时优质种子或播种材料的连续效用的大小。在很多热带国家,种子供应不足已经成为开发草地的主要障碍。有些种如坚尼草(Panicum maximum)长期出现供应短缺,有些品系如非洲臂形草(Brachi—aria decumbens)通常很差,难于收种子的草如 Lotononis bainesii 和东非狼尾草(Pennisetum clandestinum)种子价格很高。另一方面,近十年来在改良热带牧草种子生产的技术上已有很大的发展。在鉴定种子高 The excellent pasture used in rangelands discussed herein is sized to see the continuous utility of premium seeds or seeding material at reasonable prices. In many tropical countries, insufficient seed supply has become a major obstacle to the development of grasslands. Some species, such as Panicum maximum, suffer from chronic shortages of supply. Some strains, such as Brachiarina decumbens, are generally poor, seed that is difficult to seed, such as the seeds of Lotononis bainesii and Pennisetum clandestinum The price is high. On the other hand, there has been considerable technological progress in improving tropical seed production in the past decade. High seed in identification