Effects of continuous deficit irrigation and partial root-zone irrigation on root growth of young apple tree Effect of different SH6 buried depths on hormone and 15N-urea utilization of dwarf apple trees Effect of different irrigating concentrations of fermented organic fluid on the young apple tree biomass and the soil properties in replant soil EFFECT OF PACLOBUTRAZOL ON PEROXIDASE DURING OVERWINTERING OF YOUNG APPLE TREE Effects of zinc fertilization on the dynamics accumulation and distribution of dry matter and zinc in apple trees