The absorption of phosphorus in root, stem and leaf was enhanced under certain Cu level, but the concentration would decrease while the Cu concentration was above some level.
适量的铜有助于茶苗根、茎、叶对磷的吸收，但超过一定限度，则茶苗含磷量下降。
2
Screw while having dry absorption capacity, but it must be to prevent the stem turn, so as not to scratch the surface of the work.