在农业生产上.杂种优势的利用已经成为提高产量和改进品质的重要措施之一。目前,杂交玉米和杂交高粱已在我省广泛应用,播种面积分别占到实际面积的90％左右,一般都比常规良种增产三至四成。杂交种的增产作用,现在已为广大农民所认识,但是,农村实行生产责任制以 In agricultural production, the utilization of heterosis has become one of the important measures to increase production and improve quality. At present, hybrid corn and hybrid sorghum have been widely used in our province. The sown area accounts for about 90% of the actual area respectively, generally increasing the yield by 30% to 40% compared with that of the conventional elite. The increasing role of hybrids is now recognized by the majority of peasants. However, the responsibility system of production in rural areas