Tip-burn of Lettuce in relation to calcium nutrition

Abstract

The calcium content of plants was increased by high concentrations of calcium in the nutrient solution or by calcium foliar sprays. However, only the foliar spray treatments prevented the occurrence of tip-burn. After head formation had commenced, the foliar spray treatments ceased to be effective, as they could no longer be applied directly to the young leaves. Tip-burn of lettuce appears to be the result of a deficiency of calcium in the young leaves.