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The Effect of Sulfur on the Absorption and Utilization of Molybdenum by Peas¹

ABSTRACT

An experiment including a factorial combination of 4 rates of S and 3 rates of Mo fertilization was conducted on a low-S, low-Mo soil to evaluate the effects of soil S level on the absorption and utilization of Mo by peas. The uptake of soil and fertilizer Mo was markedly reduced by applications of sulfate fertilizer. The higher rates of S fertilization also reduced the apparent efficiency of utilization of Mo by the plant. Higher plant Mo levels were required for maximum yield and N fixation as the SO₄-S content of the plant tissue was increased by S fertilization. Correlation coefficients of 0.78 and 0.94 were obtained with response surface equations for seed yield and vine N content as functions of the Mo and SO₄-S contents of the plant tissues. Maximum pea yields were associated with plant tissue Mo contents of 0.3 to 1.0 ppm. and 200 to 600 ppm. of SO₄-S.

¹ Contribution from the Department of Agronomy, Washington State University, Pullman. Scientific Paper No. 2284. Washington Agr. Exp. Sta. Project No. 1142. Presented before Div. IV, Soil Science Society of America, St. Louis, Mo., Nov. 28, 1961. The investigation was supported in part by a research grant from Climax Molybdenum Company.

² Professor of Soils.

Received for publication November 2, 1962. Accepted for publication February 12, 1963.