This experiment utilized the Baiselianren variety of thick-netted muskmelon as the test material to investigate the impact of different irrigation amounts on the photosynthetic characteristics,yield,and quality of coarse-meshed melons at various developmental stages in plastic greenhouses.The results indicate that appropriate irrigation levels signif-icantly enhance plant growth and leaf photosynthesis,resulting in increased fruit yield,improved fruit quality,and higher fruit commercialization rate.As the irrigation amount increased,the photosynthetic rate,stomatal conductance,transpira-tion rate,qP,NPQ,and number of female flowers in melon plants exhibited a pattern of initial increase followed by a decrease.Similarly,single fruit weight,yield,vitamin C content,and soluble protein content followed the same trend,reaching their maximum values in the I2 treatment with 100%daily transpiration and evaporation irrigation,which were 1 544.03 g,46.32 t·hm-2,28.61 mg·g-1,and 1.07 mg·g-1,respectively.Furthermore,an increase in irrigation amount also led to an upward trend in pulp thickness,seed cavity diameter,and reticulation degree of melon fruits.Notably,the reticu-lation of melons exhibited the best quality under the I2 treatment,which involved irrigating at 100%of daily transpiration and evaporation.Considering the impact of different irrigation amounts on the growth,photosynthetic characteristics,yield and fruit quality of coarse-textured melons at different stages of development in plastic greenhouses,we determined the I2 treatment(irrigation based on 100%of daily transpiration and evaporation)was a more suitable water management method,it is recommended that during the melon production,more detailed irrigation can be carried out according to 100%of the daily transpiration and evaporation during the early vine expansion and fruit development stages of the melon,and 80%of the daily transpiration and evaporation during the middle and late vine expansion stages of the melon.
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