Ionic Accumulation in Citrus as Influenced by Rootstock and Scion and Concentration of Salts and Boron in the Substrate

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Abstract
One-year-old nursery stocks of Valencia orange on Cleopatra mandarin rootstock, Valencia orange on sour orange, Shary Red on Cleopatra mandarin and Shary Red on sour orange were grown for 39 wks. under differential salt and B treatments applied to a soil substrate. The rootstock influenced the accumulation in leaves of B, chlorides, K, Ca, and Mg ions. The scion influenced the accumulation of Na and Ca. B, Ca, and Mg accumulation was greater for trees on Cleopatra rootstock than on sour orange while chloride and K accumulation was greater for trees on sour orange. Na and Ca accumulation was greater for Shary Red grapefruit trees than for Valencia orange trees. The severity of salt-induced leaf injury on the scion-rootstock combinations corresponds with the chloride and Na accumulations in the leaves of these trees. The greater leaf necrosis occurring on the Shary Red scions is attributed to the greater accumulation of Na in the leaves. The increased necrosis on trees on sour orange rootstock is attributed the greater accumulation of the chloride ion.