在笔者和合写的论文中,曾指出氮素营养水平对矮化和半矮化苹果树根系无机产量、光合作用和生物学产量的影响。本文是在氮素营养水平变化范围较大的情况下,列举苹果根系吸收活动的数量指标。此外,还观察了植株光合作用过程和生物学产量与根系无机产量的依存关系,指出了吸收的无机元素对形成生物学产量的利用率。试材是米丘林果蔬研究所果树栽培研究室选育的一年生“57—490”苹果营养砧,初始鲜重为4— In the author’s and co-authored essays, the effects of nitrogen levels on inorganic production, photosynthesis and biological yield of dwarfed and semi-dwarfed apple tree roots have been pointed out. This article is in the context of a larger range of nitrogen nutrient changes, the number of indicators of the apple root absorption activities. In addition, the dependence of plant photosynthesis process and biological yield on root inorganic production was also observed, and the utilization of absorbed inorganic elements for the formation of biological yield was also pointed out. The test material is an annual “57-490” apple nutrition antrum bred by the Research Institute of Fruit Cultivation of Michurin Fruit and Vegetable Research Institute. The initial fresh weight is 4-