充分灌与调亏灌溉条件下苹果树微喷灌的耗水量研究

Water Use of Micro-Sprinkler Irrigated Apple Trees Under Full Irrigation and Regulated Deficit Irrigation

摘要: 田间试验设置有两个处理：整个生育期以蒸发量的80％灌溉的充分灌处理；6月中旬到7月中旬以蒸发量的40％灌溉，而其它季节恢复以蒸发量的80％灌溉的调亏灌溉处理（RDI）。试验得出了苹果树微喷灌在上述两种灌溉条件下不同生育期的日均耗水量与蒸发皿系数。与充分灌比较，调亏灌溉处理的产量基本上没有受到影响，而灌水量减少了17%～20％，耗水量减少了10.2%～11.2%，并有效地抑制了枝条生长。

Abstract: Apple trees grown in a loam soil, were irrigated under two different treatments: 80% of E-pan all seasons (full irrigation treatment) and 40% of E-pan (Regulated Deficit Irrigation-RDI) during slow fruit growth stage plus 80% of E-pan during the rest periods. Compared with full irrigation, RDI treatment saved 17%～20% of water and kept almost the same yield and shoot growth reduced. Similar results were obtained for both years of the study. The annually averaged crop factors were 0.61 and 0.55 for full irrigation and RDI treatment, respectively.