1)水生蔬菜。这类蔬菜根系不发达,根毛退化,吸收力很弱,而它们的茎叶柔嫩,在高温下蒸腾旺盛,植株的全部或大部分必须浸在水中才能生活,如藕、茭白、荸荠、菱等。 2)湿润性蔬菜。这类蔬菜叶面积大、组织柔嫩、叶的蒸腾面积大、消耗水分多,但根群小,而且密集在浅土层,吸收能力弱。因此,要求较高的土壤湿度和空气湿度。在栽培上要选择保水力强的土壤,并重视浇灌工作。如黄瓜、白菜、芥菜和许多绿叶菜类等。 3)半湿润性蔬菜。这类蔬菜叶面积较小,组织粗硬,叶面常有茸毛,水分蒸腾量较少,对空气湿度和土壤湿度要求不高;根系较为发达,有一定的抗旱能 1) Aquatic vegetables. Roots of these vegetables underdeveloped root hair degradation, absorption is weak, and their stems and leaves tender, strong exuberance at high temperatures, all or most of the plants must be immersed in water to live, such as lotus root, white rice, water chestnuts, water chestnut . 2) moist vegetables. Such vegetables large leaf area, soft tissue, leaf transpiration area, consume more water, but the root group is small, but also concentrated in shallow soil, weak absorption capacity. Therefore, higher soil moisture and air humidity are required. To cultivate the soil to choose strong water retention, and emphasis on watering. Such as cucumber, cabbage, mustard and many green leafy vegetables. 3) semi-moist vegetables. Such vegetables are smaller leaf area, coarse tissue, leaf hair often hair, less water transpiration, less demanding on air humidity and soil moisture; root system is more developed, there is a certain drought