The effect of the supplementary light during the dark period on the reduction of leaf nitrate was studied. The times that lights were supplemented were 0, 4, 12, and 24 hours a day. The nitrate content before treatment was not different from that afte...
The effect of the supplementary light during the dark period on the reduction of leaf nitrate was studied. The times that lights were supplemented were 0, 4, 12, and 24 hours a day. The nitrate content before treatment was not different from that after treatment. The reason was supposed that the light supplementing period was too short. The nitrate content of the inner leaves was lower than that of the outer leaves at the 0 hour treatment. The fresh weight was increased continuously during the experiment, except that it was decreased at the 4 hour treatment. The fresh weight at the 24 hour treatment was lower than the others.