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Ionic Balance and Corn Growth in a Port Byron Soil¹

Corn (Zea mays) was grown on a Port Byron soil treated with either NH⁺₄—N or NO^–_a—N and various rates of CaCl₂·2H₂O. The corn tissue was analyzed for Ca²⁺, Mg²⁺, K⁺, N, P, S, Cl, and NO^–_a—N. Equilibrium extracts of the soil were analyzed for Ca²⁺, Mg²⁺, K⁺, and electrical conductivity.

The organic anion content of corn was determined as the difference between inorganic cations and anions. The organic anion content varied from 252 to 751 µeq/g plant due to changes in N fertilizer and CaCl₂·2H₂O addition. The growth of corn was not related to organic anion content.

Plant weight was inversely proportional to the negative logarithm of the ionic strength of the soil solution.

Fertilization with NH⁺₄—N resulted in an increased SO=₄ content of the plant in the absence of CaCl₂·2H₂O.

Calcium content of the plant was a linear function of pCa in the soil solution. Magnesium and potassium contents of the plant tissue were related to the functions pMg—0.5pU and pK-pU of the soil solution, respectively.

Key Words: nitrogen sources • calcium • organic anions • nutrient balance • ion uptake

² Research Soil Chemists, IMC.

Received for publication February 17, 1968.