Mineral element concentrations in corn leaves by position on the plant and age

Leaves from corn (Zea mays L.) plants, grown in nutrient solutions, were harvested regularly from seedlings to maturity by position on the plant and analyzed for P, K, Ca, Mg, Mn, Fe, B, Cu, and Zn. Concentrations of the mineral elements were higher in seedling leaves, decreasing with position up the plant. Macronutrients decreased more rapidly than micronutrients. Except for decreased P and K, concentrations of the mineral elements increased in the leaves with age. Increases were relatively large for Ca, Mg, Mn, and B and slight for Fe, Cu, and Zn. Corn leaves varied markedly in mineral element concentration with leaf position and age. If available, roots can provide adequate minerals for kernel development independent of leaves.