在水稻高产育种中,必须注意边际效应和选择指标,否则,会前功尽弃。本试验的目的,在于探讨边际效应的差异及生物产量、收获指数与稻谷产量的关系,为高产育种提供理论依据。材料与方法选用威优35、早孤64、温150等11个品种(系)为试验材料,研究边际效应的材料为 In high-yielding rice breeding, we must pay attention to the marginal effects and selection of indicators, otherwise, will give up. The purpose of this experiment is to explore the differences in marginal effects and biological yield, harvest index and the relationship between rice yield, provide a theoretical basis for high-yielding breeding. MATERIALS AND METHODS Eleven varieties (lines), such as Weiyou 35, Zaojian 64 and Wen 150, were selected as experimental materials and the materials for studying the marginal effect were