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越冬青菜按上市时期又可分为越冬耐寒青菜(冬至至立春上市)和越冬早春青菜(立春至清明上市)。我市越冬耐寒青菜的主栽品种为矮青,越冬早春青菜的主栽品种为上海青。 矮青为弱冬性品种。适宜播期为9月中下旬,当日平均气温下降到10℃以下时,经过10～20天,一般在12月中旬植株茎端就开始花芽分化,叶腋分化立即停止,到翌年立春后温度回升时,才能很快抽薹;上海青则属于强冬性品种。10月上中旬为其适宜播期,当日平均气温下降到0～5℃时,经过40天植株便可通过春化阶段,立春后气温回升时抽薹较慢。
Winter market by the time of the market can be divided into overwintering hardy vegetables (winter solstice until the beginning of spring listing) and early spring vegetables (Li Chun to Ching Ming listing). City, the main varieties of winter cold hardy vegetables for short green, the main varieties of winter spring vegetables for the Shanghai Green. Short green for the weak winter varieties. Suitable for sowing in late September, when the average temperature dropped to below 10 ℃, after 10 to 20 days, usually in mid-December plant stems began to flower bud differentiation, axillary differentiation stopped immediately to the following year after the beginning of spring temperature rise , Can quickly bolting; Shanghai Green is a strong winter varieties. In mid-October for the appropriate sowing date, the average temperature dropped to 0 ~ 5 ℃ on the same day, after 40 days of plants can be through the vernalization stage, early spring after the temperature rise bolting slower.