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KMID : 0903619830240040265
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Journal of the Korean Society for Horticultural Science
1983 Volume.24 No. 4 p.265 ~ p.275
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Effects of Nitrogen Sources and Nitrogen - supplied Period on the Growth , Yield , and Quality of Vegetable Crops
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Abstract
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Effects of nitrate, ammonium and nitrate＋ammonium nitrogen on the growth of several vegetable crops were investigated in sand culture with relation to nitrogen concentrations, other canons and anions, solution pH and growth stage. Effects of urea nitrogen were also studied.
In most cases, plants supplied with nitrate showed the greatest growth, and ammonium plants the least. Nitrate-ammonium plants at higher pH and Ca level showed almost equal growth to nitrate plants. Growth of urea plants were slightly superior to that of ammonium plants.
On the effects of nitrogen-supplied period on growth, ten kinds of vegetable crops with different growth patterns were studied in sand culture.
These crops were classified into two groups, viz. the one requiring nitrogen supply during whole growth period, and the other not requiring so much nitrogen for some period immediately before harvest. Eggplant, strawberry, cauliflower, spinach and Chinese cabbage for seed growing were contained in the former group, and potato, turnip, onion, cabbage and green soybean in the latter group.
As for quality, the contents of ascorbic acid and pigments of some vegetable crops were compared in the experiments of nitrogen sources, and also the contents of soluble solid, ascorbic acid and specific gravity were determined in the experiments of nitrogen-supplied period.
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