Effects of races and cultivation conditions on the contents of ascorbic acid, sugar and nitrate in qing gin cai (Brassica campestris L. spp. chinensis Makino)
2005
Ikeba, T.(Ibaraki-ken. Horticultural Research Inst., Iwama (Japan)) | Kaizuka, T. | Ishii, T. | Kashima, K.
Effects of races and cultivation condition on the contents of ascorbic acid, sugar and nitrate were investigated in qing gin cai. 1. 'Butei' and 'Natusintoku' grown in summer, 'Niihaosinl gou' and 'Fuyusyoumi' in winter were high quality by containing a large quantity of ascorbic acid and sugar, and a small quantity of nitrate. 2. The contents of each component in qing gin cai fluctuated with the season. Especially, the nitrate content of plants grown in the summer was about 2 times higher than that of plants grown in the winter. The sugar content showed a completely opposite tendency to nitrate content, and was higher in the winter. The tendency of ascorbic acid content by season was not clear. 3. Even if the cultivation house was covered with cheesecloth to prevent damage from harmful insects, the temperature in the plastic green house could fall by opening the window in the ceiling, and ascorbic acid and sugar contents increased , and nitrate content decreased. 4. Ascorbic acid and sugar contents of the plants given nitrogen were higher than that of the plants given 10 kg/10a. Opposite to this, the nitrate content of the plants given 7 kg/10a nitrogen showed a lower tendency than 10 kg/10a.
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