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收获指数是作物育种中运用的一项性状指标,也用于评价农技措施的效应。Donald(1962)把收获指数定义为籽粒重量与干物质总重量之比,后来又描述为光合产物分配的一个测量值。 人们常常要求小麦、水稻、高粱等禾谷类作物提高收获指数,从而大幅度提高其增产潜力。人们也常常建议把提高收获指数作为豆科作物和油料作物育种中的一个重要目标。但是,不同作物籽粒,其化学成分不一,而且,籽粒构成和植株(秸秆)残留的干物质也不一样。籽粒中的能量含量则依其
Harvest index is a trait indicator used in crop breeding and is also used to evaluate the effect of agricultural measures. Donald (1962) defined the harvest index as the ratio of grain weight to total dry weight, which was later described as a measure of distribution of photosynthate. People often ask cereal crops such as wheat, rice and sorghum to increase the harvest index, thus greatly increasing their yield potential. It is also often suggested that raising the harvest index as an important goal in the breeding of leguminous and oilseed crops. However, different crop seeds have different chemical compositions, and the dry matter content of the grain composition and plant (straw) residues are also different. The energy content of the grain depends on it