PERFORMANCE OF MARSH SEEDLESS GRAPEFRUIT ON 6 ROOTSTOCKS IN CYPRUS

Yield, fruit quality, growth and the levels of 12 elements in the leaves were measured for 12 yr old ''Marsh Seedless'' grapefruit trees on 6 rootstocks. Trees on rough lemon and ''Cleopatra'' mandarin were larger than those on sour orange and consistently produced 67 and 23% more fruit, respectively, than on sour orange. Trees on ''Palestine'' sweet lime, ''Troyer'' and ''Morton'' citranges were the least productive. Three-year means of total soluble solids ranged from 9.4% for fruit from trees on ''Palestine'' sweet lime to 11.2% on ''Cleopatra'' mandarin. Fruit size was good on all rootstocks but effects of rootstock on levels of Mg, Na, Cl and B in the leaves were statistically significant.