采用基质栽培试验研究了不同有机肥种类对叶类蔬菜（芹菜和生菜）硝酸盐和营养品质的效应。
The effects of six organic manures on nitrate content and nutrient quality of foliage vegetables (celery and romaine lettuce) were studied in soil-less culture.
比如种上成熟快的蔬菜，如生菜、青菜或甜菜时兼种成熟较慢的蔬果，如南瓜属植物或攀沿类豆荚。
One example involves combining fast-maturing vegetables, such as lettuce, field greens or beets, with slower-maturing ones like winter squash or pole beans.
生菜、番茄和黄瓜有许多种，这三类食品的所有种类都是感染源的可能性非常小。
There are many varieties of lettuce, tomatoes and cucumbers and it would be very unlikely that all types of all three groups of foods would be the source of the outbreak.
生菜、番茄和黄瓜有许多种，这三类食品的所有种类都是感染源的可能性非常小。
There are many varieties of lettuce, tomatoes and cucumbers and it would be very unlikely that all types of all three groups of foods would be the source of the outbreak.
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