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Abstract
This study was conducted to study the effect of different growing seasons (summer, winter and spring as control), covering materials (glass, polyethylene and white net as control) and day times ( 8:00 AM, 1:00 PM and 6:00 PM ) on the environmental factors such as light intensity, air temperature and relative humidity inside greenhouse. These factors have been studied in order to create optimum conditions for successful mango seedlings grafting process and develop the vegetative growth. Light intensity and ambient air temperature recorded the highest average values in glass greenhouse during summer season at 1:00 PM. While, the lowest value was recorded under polyethylene and white net covering materials during winter season at 6:00 PM. In the contrast, the relative humidity (RH) recorded the highest average value under net covering material during winter season at 1:00 PM. The lowest value of relative humidity was observed during winter season for both covering materials (polyethylene and glass). The vegetative parameters achieved the greatest average values under polyethylene and glass covering materials in spring season and followed by winter and summer seasons using polyethylene covering material. However, the lowest average values were recorded under net covering material during summer season. It can be concluded that there were no high significant differences between the average values of vegetative parameters under polyethylene and glass covering materials during winter season and net cover material during spring season. For grafting the mango seedlings during summer and winter seasons successfully, it is strongly recommended to combine polyethylene with white net covering material during unstable conditions