And the contents tendencies of Na +, Cl - and K + of the unitage dry weight in roots were similar with them in the sh地下部单位干重积累的Na+、Cl 和K+情况与地上部单位干重积累的各离子趋势相似
It mainly embodies that the unitage cost price of the former is lower than that of latter.主要体现在单位产量饲料配方中的成本价格前者要低于后者。