甜菜需水量分析

Analysis on Water Requirement in Sugarbeet

测定看出,不同年度间甜菜需水量有变化,但需水规律是一致的,以生育中期需水量最大,占全生育期的60％～70％;其正常生长的临界需水量为270m^3/亩;在半干旱区,应适当灌溉,当甜菜需水量在360～370m^3/亩时,可获较高的根产量和含糖率;当生育期降雨量增多时,可适当调整灌溉量,以提高水分利用率。

The test result shown that the water requirement of sugar beet were variable in different year,but the law of water requirement were unanimous, the maximum water requirement was in middle of growing stage, it covers nearly 60%~70% of whole season. The critical water requirement was 270m3/mu under normal growth. High root yield and high sugar content could be obtained when water requirement was 360~370m3/mu in semiarid region. For increasing the utilization percent of water, it should be adjusted irrigation norm when the rainfall got more.