Abstract：In greenhouse and under drip irrigation condition, the effects of regulated deficit irrigation on growth, yield, quality and water use efficiency of muskmelon(Yilishabai variety)are investigated. Five treatments: T1(75%-75%), T2(75%-55%), T3(65%-65%), T4(55%-75%)and T5(55%-55%)are conducted according to relative soil moisture of two different growth periods such as vegetative and reproductive growth stages. It is showed that the plant height, stem diameter and leaf area are diminished with the increasing water deficit in vegetative growth stage. During fruit development stage, the fruit size and yield depend on water deficit in both vegetative and reproductive growth stages, i.e. the more the deficit, the lower the fruit and yield. The yield of T1 and T2 is the highest, and T5 is the lowest, but T3>T4, and the differences between treatments are significant. The water use efficiency of T2 is the highest, the efficiency of T1 and T4 is lower. Compared with T4, the irrigation amount of T2 is basically the same. However, the yield and water use efficiency are increased by 26.2% and 27.7%, respectively. In quality, the content of TSS is increased as the water deficit is more severe. The contents of soluble protein, free amino acids and vitamin C are increased under full irrigation in vegetative growth stage and under deficit irrigation in reproductive growth stage. However, the deficit irrigation in vegetative growth stage and copious irrigation in reproductive growth stage are conducive to synthetize titrateble acid. Taking all things into consideration, the irrigation condition of T2(75%-55%)may be the most appropriate irrigation schedule with drip irrigation in greenhouse in Wuhan area.
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