:1999年在南方玉米育种开发中心贵州省夏云县基地进行了玉米杂交种初比试验。参试的白、黄粒组合共 2 80 0份 ,在 2 40 0份黄粒组合中比对照交三单交增产超过10 %的有 18份 ,比 95 0 3增产的有 12份 ,在 40 0份白粒组合中 ,有 34份材料产量超过毕单 4号 ,其中有 2 0份比对照增产 10 %以上。试验证明 ,温带的迟钝型种质在贵州省有一定的适应性和良好的丰产性 ,如西公× 12 3,GY34 9×P138,90 41× 2 0 0、9714 8× 6 2 9等 In 1999, the initial ratio of maize hybrids was tested at the base of Xiayun County, Guizhou Province, in the South Corn Breeding and Development Center. A total of 2 80 0 white and yellow combinations were tested. Among 2 240 yellow combinations, 18 were more than 10% more yield than the control, 12 more than 95 0 3, Among the 0 white grain combinations, 34 were produced more than Bi No. 4 with 20 of them yielding more than 10% of the control. Experiments show that temperate and slow type of germplasm in Guizhou Province has some adaptability and good yield, such as Xigong × 12 3, GY34 9 × P138, 90 41 × 2 0 0,9714 8 × 6 2 9 etc.