充分灌与调亏灌溉条件下桃树滴灌的耗水量研究

Study on water use of drip irrigated peach tree under the conditions of fully irrigated and regulated deficit irrigation

本文研究了充分灌与调亏灌溉条件下桃树滴灌的耗水量 .在田间设置有两个处理 ,其一是在整个生育期以蒸发量的 80 %进行充分灌溉 ;其二是在果实生长缓慢期以蒸发量的 2 0 %进行亏缺灌溉 ,而在其它季节以蒸发量的 80 %进行充分灌溉 .利用石膏块土壤水分传感器和中子仪分别测量了根区土壤水势和土壤含水量的变化 ,并实测了果实生长量、枝条生长量和产量 .利用水量平衡法得出了在上述两种滴灌条件下桃树不同生育期的日均耗水量与蒸发皿系数 .与充分灌比较 ,调亏灌溉对产量没有影响 ,灌水量减少了 32 % 。

Peach trees planted on clay loam soil are divided into two districts with different irrigation conditions.In the first district,the trees are fully irrigated with water volume equivalent to 80% of evaporation in the total growth period.Whereas,in the second district,the trees are irrigated according to regulated deficit irrigation principle with water volume equivalent to the sum of 20% of evaporation during fruit slow growth stage and 80% in the rest of growing period.It seems that the total yield of fruit does not decrease under the condition of regulated deficit irrigation but the water use is significantly reduced.The annual crop factors are 0\^474 and 0\^378 for full irrigation and regulated deficit irrigation respectively.