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我们在玉米育种实践中，对遗传力和杂种优势的常用计算方法，从１９７４－ １９７９年进行了考察和验证，结果表明广义和狭义遗传力估计法，遗传相关和回归 法不仅计算繁琐，而且看不出规律，尤其试验材料纯度稍差些时，甚至毫无结果。 采用变异系数计算时，亦有类似情况。而相对遗传力法不仅有理论根据、计算简便， 又能较准确的阐明主要产量性状的遗传规律，指导育种实践。根据摸索的规律，我们 有目的地组配了春单１１４（春英１×门１４）、春单３４（长３×长４）两个玉米单交组合， 经１９７７—１９７９年三年所内外试验表明：一些主要农艺性状弥补了现在主推种的不 足，具有推广价值。上述两个组合现已进入生产示范阶段。
In maize breeding practice, we used common methods of calculating heritability and heterosis from 1974 to 1979. The results showed that generalized and narrow heritability estimation methods, genetic correlation and regression methods were not only cumbersome, but also considered Not out of regularity, especially when the purity of the test material is slightly worse, there is even no result. When using the coefficient of variation, there are similar cases. The relative heritability method is not only based on theory, simple calculation, but also more accurately explain the genetic traits of the main yield traits, and guide breeding practice. According to the law of groping, we have purposely equipped with spring single 114 (Chun Ying 1 × door 14), spring single 34 (long 3 × 4) two corn single cross combinations, by 1977-1979 three years both inside and outside Experiments show that: some of the main agronomic traits to make up for the lack of the main push now, with the promotion of value. The two combinations have now entered the production demonstration phase.