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Development of Molybdenum Deficiency Symptoms in Certain Crop Plants¹

ABSTRACT

Molybdenum deficiency symptoms in six important crop plants were developed, described, and photographed. Deficiency symptoms were developed in the first generation of broccoli, cauliflower, and tobacco; in the second generation of corn, cotton and soybeans.

With large seeded crops it was necessary to develop seed low in molybdenum before severe deficiency symptoms could be produced. In the case of corn and cotton, germination of the molybdenum-deficient seed was at a slower and lower rate than for seed adequately supplied with the element. First generation cotton plants which received nutrient solution purified of molybdenum developed abnormal bolls.

Molybdenum deficiency symptoms were developed in plants grown in a pyrex glass cullet-wool mixture, pyrex glass sand, quartz sand, and aerated nutrient solution. The macronutrient stock solutions were purified of molybdenum by copper sulfide coprecipitation technique.

¹ Contribution from the Soils Department and Agr. Exp. Sta., Rutgers University. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree and presented before Div. IV, Soil Science Society of America, Aug. 7, 1958, Lafayette, Ind.

² Formerly Research Assistant in Soils, Rutgers University, now Associate Professor and Associate Agronomist, University of New Hampshire; and Professor of Soils, Rutgers University, respectively.

Received for publication September 4, 1959. Accepted for publication September 13, 1960.