Breeding density: brood stage is refers to the unit in the area of feeding bird-flu brood only number.
饲养密度：在育雏阶段是指单位育雏面积上饲养的雏鸡只数。
Adequate root number, deep root system, and efficient root activity per unit of root biomass will be needed for high-yield rice in the future breeding programs.
提出了未来水稻根系育种的一个方向，既适当控制根系的数量，增加根的平均长度，加深根在土壤中的分布，扩大根系的面积以及提高单位根量的根功能。
Increasing yield level per unit area is forever theme for rice breeding aim, and advancing photosynthesis efficiency is one of key factors for improving grain yield.
提高单位面积的产量是水稻育种目标永恒的主题，提高光合作用效率又是提高产量的关键因素。
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