Study on the nutrition requirements of American ginseng. VI. Study on nitrate reductase activity (NRA) of American Ginseng (Panax quinquefolius)

Two peaks were present in the NRA annual curve of panax quinquefolius). A high Peak appeared in late April and a lower peak occured in early July. It is important to apply N: fertilizers just before the appearance of the two Peaks. Experiment on the effect of diffeent light and pH showed that higher NRA formed at 4000 Lx and pH 4.3-6.0