Physical and Chemical Characteristics of Expressed Citrus Leaf Sap and Their Significance

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Abstract
Fundamental differences exist in the freezing point lowering and in the ash, Ca, and Mg content of leaf sap of Eureka lemon as compared with Valencia and Washington Navel orange. The sap of normal mature lemon leaves is less active osmotically and contains less ash and Ca, but more Mg, than the sap of orange leaves. The fact that the sap of the lemon leaf is more dilute than that of the orange leaf furnishes a partial explanation of the differences between lemon and orange trees in their sensitiveness to low temp.

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