Abstract
The effects of nitrogen withheld for one month each in various growth stages from the transplanting early in June to the termination of harvest early in October, on the growth, flowering and yield of egg-plant were investigated in the sand culture outdoors.
Soon after nitrogen removal at any stage of growth, the percentage of flowers with short style increased, and after two weeks number of flowers decreased. While, shortly after nitrogen was supplied again, the percentage of flowers with long style increased, and after two weeks number of flowers increased, and recovery of yield was found after four weeks.
Fruit yield was the least, when nitrogen was not supplied for the period, from early in August to early in September, in which flowering and fruiting were active. The earlier the period in which nitrogen supply was withheld, the slighter was the lowering of fruit yield. On the other hand, there was no significant difference in yield between the control supplied with nitrogen throughout all growth stages and the treatment supplied with no nitrogen in the last stage after early in September.
