北京郊区多实行玉米、小麦间套种植制,玉米株数一般为2000株/亩,增加玉米单株产量是提高间套玉米产量的重要途径之一。近年来作者致力于大穗、多穗杂交组合的研究,积累了一些资料,可供有关的同志参考。“繁荣1号×凤白29B”就是一个较有希望的组合。其母本自交系“繁荣1号”三穗率高(达50％以上),父本自交系“凤白29B”则双穗率高(70— In Beijing suburbs, corn and wheat intercropping systems are mostly practiced. The number of maize plants is usually 2000 plants / mu. Increasing the yield of maize plants is one of the important ways to increase the yield of maize. In recent years, the author devoted himself to the research of big ear and multi-spike hybrid combination, and accumulated some information for the reference of the comrades concerned. “Prosperity No. 1 × Fengbai 29B” is a more promising combination. The female parent inbred line “prosperity 1” three spike rate (up to 50%), male parent inbred line “Fengbai 29B”