在国内外水稻、小麦、大豆等自交作物杂交育种中,复合杂交的方式得到了越来越广泛的应用。以黑龙江省农科院大豆所的大豆育种为例,1957～1963年间共配制了273个杂交组合,其中复交组合27个,不足10％;而1964～1973年间共配制了214个杂交组合,复交组合41个,占将近20％。塞隆尼和费尔(1970)的试验曾指出,三系集团[(当地品种×引入品种)×当地品种]较二系集团(当地品种×当地品种)的变异广泛,易于选出产量高或蛋 At home and abroad, rice, wheat, soybean and other self-cross crop breeding, the way of cross-hybrid has been more and more widely used. Taking soybean breeding by Soybean Research Institute of Heilongjiang Academy of Agricultural Sciences as an example, a total of 273 crossbreeding combinations were made between 1957 and 1963, of which 27 were complex crossbreeds, less than 10%; 214 crossbreeding combinations were made between 1964 and 1973, Combined 41, accounting for nearly 20%. Experiments by Theron and Fern (1970) have pointed out that the variation in the three-line [(local varieties × introduced varieties) × native varieties] compared to the second-group (native varieties × native varieties) egg