Performance of Watermelon Grafted onto Different Rootstocks

Discussion Committee: 
Dr. Hassan Abu Qaoud (Supervisor)
Dr. Munqez Shtaya (Internal Examiner)
Dr. Abdallah All Omari (External Examiner)
Dr. Hassan Abu Qaoud
Hashem Derdah Ahmed Ali
The influence of using different rootstocks on the success of grafting, plant growth, fruit yield and fruit quality of two watermelon cultivars ( Crimson Sweet and Jaddoai ) was studied. The experiment was conducted in open field (Low tunnel) in Bardalla (Palestinian Northern - Ghor region). The rootstocks used were 'Pumpkin (Cucurbita moschata), Gladioter watermelon(Citrullus lanatus var. Gladioter), Al-kamari squash (Cucurbita pepo var. melopepo), and Ein-senna squash(Cucurbita maxima) '. One cotyledon (splice/slant-cut) grafting method was used. In addition to, the above combinations both self grafted and non-grafted of the two cultivars were involved. The seedlings were then hand planted in the field. The combination treatments were arranged as a factorial treatment in a completely randomized design. The results revealed a high percentage ranged from 90-100% of successful grafting combination for both cultivar scions and rootstocks. The total fruit yield of grafted plants was significantly higher than that of non-grafted plants onto both rootstock cultivars. The highest total production was obtained when both Pumpkin and Gladioter rootstocks were used (15.1 and 14.2 kg/plant respectively). On the other hand, both Ein-senna and self-grafted plants resulted in the lowest production (10.4 and 11.3kg/plant respectively). Grafted plants in both Pumpkin and Gladioter rootstocks were more vigorous than the grafted Ein-senna rootstock ones. Plants grafted onto ‘Pumpkin’ and ‘Gladioter’ produced 8.363 kg/plant and 8.050 kg/plant more vegetative fresh weight than the grafted Ein-senna rootstock and self-grafted (4.263 kg/plant and5.293 kg/plant), respectively, whereas non-grafted (control) plants had a lower vegetative fresh weight in both treatments. Both control and self-rooted plants showed earliness in their production. Grafting improved stem length, number of lateral branches per plant, number of leaves per branch, root length and vegetative fresh and dry weights of stem, leaves and root. Ein-senna was significantly poor for biomass characteristics than the other rootstocks. An increase in brix% in the rind of the fruit was obtained in all grafting combination excepted with Ein-senna rootstock (4.5%), the higher brix value was obtained inside the fruit when Gladioter was used as rootstock(12.5%).
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