Abstract
MH solutions of 0.05 to 0-25% containing wetting agent were sprayed at the rate of 1800 liters per ha to the tea plant, about 30 days before flushing.
The concentration of the leaf juice was raised with increasing the concentration of MH solutions. The tea flushing time was delayed proportionally to the concentration of MH solutions, with the following regressive relation of
Y=3.5+110x
The more, the concentration of MH solution the less the injury of the tea plant, owing to the delaying of the flush time. So the interval of the plucking date of each plot came close.
In the plots treated with MH, though the frost injury was reduced, the yield decreased owing to MH agency. Therefore, the differences of yield between each plot were not significant, cancelling these two effects with each ohter. MH is effective to reduce the frost injury of the tea plant but its practical value is doubtful.
