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Molybdenum Response of Alfalfa on Indiana Soils in the Greenhouse¹

ABSTRACT

Greenhouse experiments were conducted to determine the response of alfalfa to Mo on Indiana soils.

Twenty-five soils, representing 18 soil types from the major soil areas of Indiana, were used. The pH of the soils ranged from 4.8 to 7.4. Treatments included combinations of no lime; 250 pounds of CaCO₃ per acre, mixed with the surface inch of soil; limed according to soil test; no Mo; and 2 pounds of Mo per acre. Three cuttings of alfalfa were obtained.

Mo produced significant yield increases on 9 of the 18 soil types studied, and 7 others gave responses approaching significance. A significant response to Mo was obtained at the high rate of lime on 2 soils, and on 6 other soils increases were obtained which approached significance. This suggests a deficiency of total Mo in these soils. Mo treatment reduced alfalfa yields on 3 of the acid soils which received the high rate of lime and on I soil having an initial pH of 7.0.

Results with one soil indicated that drying prior to cropping increased the response to Mo.

¹ Journal Paper No. 1181, Purdue Univ. Agr. Exp. Sta., Lafayette, Ind. Contribution from the Dept. of Agronomy. Presented before Div. IV, Soil Science Society of America, Atlanta, Ga., Nov. 21, 1957. This research was supported by a grant from the Climax Molybdenum Company.

² Formerly Assistant Professor of Agronomy, Purdue Univ., Lafayette, Ind., now soil scientist, SWC. ARS, USDA, Fayetteville, Ark.; and Associate Professor of Agronomy, Purdue Univ., respectively.

Received for publication February 13, 1958. Accepted for publication September 16, 1958.