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Effects of irrigation control by time and integrated solar radiation on musknelon quality in perlite culture were investigated. Sugar content of melon flesh was high in the irrigation treatment at the following times 6：00, 8：00, 10：00, 11：00, 12：00, 12：30, 13：00, 13：30, 14：00, 14：30, 15：00, 16：00, a...

Effects of irrigation control by time and integrated solar radiation on musknelon quality in perlite culture were investigated. Sugar content of melon flesh was high in the irrigation treatment at the following times 6：00, 8：00, 10：00, 11：00, 12：00, 12：30, 13：00, 13：30, 14：00, 14：30, 15：00, 16：00, and 17：00(T-2), compared to the irrigation treatment at every hour from 6：00 to 18：00(T-1) within the irrigation experiment controlled by time. Within the irrigation experiment controlled by integrated solar radiation, sugar content was as high as 15.7(Brix$^{\circ}$) in the 240Wh.m$^{-2}$ , compared to the 180, the 200, and the 220Wh.m$^{-2}$ . Fruit firmness was low in T-2 within the Irrigation experiment by time and in the 220Wh.m$^{-2}$ within the irrigation experiment by integrated solar radiation. Fruit size was smaller in the treatment controlled by integrated solar radiation than by the time treatment. Fruit weight was the heaviest in T-1. The weight of the shoot except for the fruit was lower in treatment of irrigation by integrated solar radiation than by time. In conclusion it is suggested that the appropriate integrated solar radiation pet each irrigation cycle should be 180~20Wh.m$^{-2}$ in the early growing stage, and then gradually increased to 240Wh.m$^{-2}$ from net formation to harvest time.

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