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This study was conducted to determine the effects of grafting and rootstock-scion combinations on the yield and nutrient content for both the leaves and fruit of watermelons. Two watermelon ( Citrillus lanatus (Thunb.) Matsum and Nakai ) varieties Crisby and Crimstar were grafted on to Ferro and RS 841, and the commercial hybrids of Cucurbita maxima x Cucurbita moschata . Non-grafted plants were used as controls. In the grafted plants the c ontent of K, Mg, Ca, Fe, Cu, Zn and Mn in the leaves and N in fruits significantly increased when compared to the control. A significant effect was observed in the rootstocks for the Fe, Cu, Zn content in the leaves and the N, P, Ca, Cu and Zn content in the fruit. The K and Fe content in the leaf and the Fe, Cu, Zn and dry matter content in the fruit were also found to be significant between the varieties. Grafting and rootstock-scion combinations affect fruit yield. The Crimstar/Ferro combination had the highest yield. Also, in the grafted plants , the dry matter content of the fruits had a significant positive correlation with the Ca and Mg content of the leaves.