水稻超高产育种是当前世界性的热门课题，也是难题。
Rice breeding for maximum yield is a hot topic today in the world and a tremendous challenge as well.
可见，以经济系数作为小麦高产及超高产育种的选择指标是可行的。
These can be concluded that it is feasible and general to take economic coefficient as selection goal of breeding for high yield.
为了研究北方大穗型杂交粳稻超高产的生理基础，为选育大穗型的北方杂交粳稻提供育种理论。
In order to study the physiological base on super high yield of the northern japonica hybrid rice and offer breeding theory about large-panicle northern japonica hybrid rice.
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