Abstract
In this report, the relation between occurrence of`Goma-sho'and rate of nitrogen basal fertilizer was investigated in Chinese cabbage. The rate of nitrogen fertilizer tested was 10, 20, 30 kg per 10a. The occurrence of`Goma-sho'was generally promoted by increasing of basal nitrogen fertilizer. The striking occurrence was found in all plants cultivated with 30kg of nitrogen fertilizer and often in big plants cultivated with 10 and 20 kg of nitrogen fertilizer. These`Goma-sho'plants had a relatively high amount of nitrate and alpha amino nitrogen and low amount of sugar. It should be noted here that the symptom of `Goma-sho'was pronounced when the contents of these nitrogen compounds were higher in leaf blades than in midribs. from these results, it was concluded that for prevention of`Goma-sho'the optimal rate of basal nitrogen fertilizer was less than 20 kg per 10a and the physiological cause of this symptom was due to imbalance of nitrate, alpha amino nitrogen, and sugar contents.
