Leaf analysis and soil fertilizing were adopted to systematically study fertilizer-required rhythm and fertilizing effection on ShuangYou Vitis amurensis .The results showed:
Seven mineral elements in leaf stalks of ShuangYou Vitis amurensis were obviously different from fresh grapes on change characteristics in growth season. The nitrogen content declined in the whole growth season. Nitrogen declined rapidly in former period, slowed while new shoots stop growing in middle time, and d...