在南京地区进行美洲狼尾草（Ｐｅｎｎｉｓｅｔｕｍａｍｅｒｉｃｕｎｕｍ）与象草（Ｐ．ｐｕｒｐｕｒｅｕｏｎ）的种间杂交，对象草作短日照处理，以诱导其抽穗、开花。通过对象草不同移栽期、不同短日照处理天数的试验及对影响花粉量诸因子的综合分析表明：较早移植象草（５月５日移栽），覆膜２１ｄ能有效提高父本的花粉量。 The interspecific cross between Pennisetum americana and P. purpureuon was carried out in Nanjing, and the object grass was treated with short daylight to induce its heading and flowering. Through the different grass transplanting period, the number of days of different short-day treatment experiments and the impact of pollen on a variety of factors comprehensive analysis showed that: the earlier transplantation of grass (May 5 transplanting), covering 21d can effectively improve the male parent Pollen amount.