1988年皖北、苏北一带,自5月中旬至7月中旬两个多月基本未降雨,在严重干旱情况下,新栽幼树成片旱死。笔者在安徽省砀山果园场,调查了当年5月定植的22亩苹果矮砧不同组合1年生苗的受旱状况和土壤水分状况,不同砧木和品种的耐旱能力差异较大。当土壤含水量持续30天以上,小于田间? In 1988, the northern part of northern Anhui and northern part of Jiangsu were basically not rained for more than two months from mid-May to mid-July. Under severe drought conditions, the newly planted saplings became dry. The author investigated the drought conditions and the soil moisture status of the 22-year-old apple dwarf rootstocks with different combinations of 1-year-old seedlings planted in May of that year in Dangshan Orchard Field of Anhui Province. The drought-tolerant capacities of different rootstocks and varieties differed greatly. When the soil moisture for more than 30 days, less than the field?