地膜覆盖栽培甜菜的需水特点

The Characteristic of water Requirement of Sugarbeet with Plastic Film Covered Cultivation

甜菜地膜覆盖栽培从全生育期看需水量并未减少,各生育期的需水规律与裸地栽培相一致,只是叶面蒸腾量与棵间蒸发量比例发生了变化。因此,当无灌溉条件降雨又少时,地膜覆盖甜菜受干旱威胁更大,故在干旱无灌溉地区不宜推广地膜覆盖技术。

The amount of water repuirement has not decreased in the whole season of sugarbeet cultivation with plastic film covered. The regular pattern of water requirement in different growing stage was similar to uncovered cultivation. Only the changes in the ratio of transpiration of foliage and evaporation between plants. Therefore, there were more menace to sugar beet covered with plastic film when in dry condition, no irrigation and little rain. So, the techniques of covered with plastic film is inadvisable to popularize in the dry and no irrigation regions.