Effects Of Different Irrigation Rate On Growth And Development, Yield, Fruit Quality And Irrigatiion Water Use Efficiency Of Muskmelon In Solar Greenhouse

In this test, the influence of different irrigation frequency under the same total irrigation condition on the height, stem diameter, leaf area, chlorophyll content, dry matter accumulation, fruit shape index, yield, quality and water using of thick skin melon(Cucumis melo L.var.reticulatus Naud.) plants, which was grown in sand in greenhouse, was studied. Analyzed the rule of moisture changes in melon under the condition of different irrigation frequency; discussed the effect of different irrigation frequency on the physiological ecology, growth and development, fruit growth and quality, water using of melon plants; explored the formation of irrigation of melon cultivation under non-cultivated condition in greenhouse, to improve water using efficiency of non-cultivated melon. This has important significance for making full use of water in plant growth and improving the yield and quality of non-cultivated melon. The main results were as follows:1. Compared with conventional irrigation, increasing irrigation frequency made the melon plants height reduce slightly and stem diameter increase significantly. And high-frequency irrigation showed a slow growth in vegetative prophase, and a significantly increasing in late vegetative growth and growth stage, in growth rate compared with conventional low-frequency irrigation. Increasing irrigation frequency reduced the vertical growth of melon plants, while horizontal growth was significantly increased.2. The increasing of irrigation frequency decreased leaf area of melon plants slightly, which was no significant difference with control treatments, increased the chlorophyll content of melon leaves significantly. This may be the physiological basis of significant differences of fruit dry weight and plant dry weight in high-frequency treatments compared with in control dealing.3. There was no significant effect of increasing the frequency of irrigation on single fruit weight, fruit shape index (fruit horizontal diameter, longitudinal diameter and flesh thickness) and yield, leaf dry weight, stem dry weight, etc.While it could significantly impact root dry weight, root-shoot ratio, fruit dry weight, plant dry weight. 4. The quality of melon fruits was obviously better under high-frequency irrigation than that on low-frequency irrigation treatment W1. Increasing irrigation frequency made the free amino acids, total soluble sugar, and soluble solids content of melon fruits increased significantly. Although there was no evident augment in the single fruit weight when increased the frequency of irrigation, the fruit dry weight and plant dry weight of melon plants was significantly higher than the low-frequency conventional treatment.5. Increasing Irrigation frequency made the water using efficiency slightly improved compared with control, but the differences between the treatments failed to achieve significant levels. The transpiration efficiency of high-frequency W3 and mid-frequency W2 was higher than control treatment W1, and the difference between W3 and W1 reached significant level.6. In conclusion, increasing the frequency of irrigation under the same irrigation quota conditions, can significantly increase plant stem diameter, chlorophyll content and root dry matter accumulation, root-shoot ratio, and free amino acids, total soluble sugar, soluble solids content in melon fruits, to improve fruit quality. Therefore, combined with actual situation, the appropriate increasing in the frequency of irrigation under a reasonable irrigation quota condition was an effective measure, to promote the growth of melon plants and fruits quality, in agricultural production.