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甜菜的蒸腾系数比谷子、玉米稍大,比小麦、马铃薯等作物的蒸腾系数小一些,这说明甜菜比小麦、马铃薯用水经济和耐旱性强一些。但由于甜菜的单位面积产量比较高,所以它的总耗水量比较大。甜菜第一年各生长时期的需水规律是:苗期需水最少(占总耗水量的11.8—19.0％),繁茂期需水最多(占总耗水量的51.9—58.0％),糖分积累期需水比较少(占总耗水量的27.1—36.2％)。甜菜各生长期对土壤湿度的要求是:苗期和糖分积累期的土壤水分以其最大持水量的50％为宜,繁茂期以土壤最大持量的60—70％生长最好。甜菜各生长期适宜的降雨指标是:苗期110—120mm,繁茂期150mm,糖分积累期50—70mm。因为我国各甜菜产区的降雨量由东南向西北递减,所以对甜菜如何灌溉,一方面要根据甜菜的需水规律,另一方面还要根据当地降雨量的多少和分布情况,把两方面的情况结合起来因需、因地制宜进行灌溉,才能获得甜菜的丰产和高糖。
The transpiration coefficient of sugar beet is slightly larger than that of millet or corn and less than the transpiration coefficient of crops such as wheat and potato. This shows that sugar beet is more economic and drought-resistant than wheat and potato water. However, because of the relatively high yield per unit area of sugar beet, its total water consumption is relatively large. The water requirement of beets in the first year of growth was the least (at the rate of 11.8-19.0% of the total water consumption) in the seedling stage, the water requirement in the lush period (51.9-58.0% of the total water consumption), the period of sugar accumulation Less water requirement (27.1-36.2% of total water consumption). The requirements for soil moisture in each growing stage of sugar beet are as follows: the soil moisture in seedling stage and sugar accumulation period is preferably 50% of the maximum water holding capacity, and the best growth is 60-70% of the soil maximum in the lush period. Sugarbeet suitable for the growth of the rainfall indicators are: seedling 110-120mm, flourish 150mm, sugar accumulation period of 50-70mm. Because of the rainfall in the sugar beet producing areas from southeast to northwest decreasing, so how to irrigate beets, on the one hand according to beet law of water demand, on the other hand but also according to the local rainfall and the distribution of the two aspects Combine the situation due to need, irrigate according to local conditions, in order to get the beet yield and high sugar.