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Effect of Time of Molybdenum Application on Soybean Yield and on Nitrogen, Oil, and Molybdenum Contents

An evaluation of the effects of molybdenum (Mo) on soybeans (Glycine max) when applied at various periods indicated significant yield responses especially on the moderately acid shaly soils. Mo applied as a seed treatment, as a spray at the early stage (20-cm height), and as a spray at the pre-bloom stage were not significantly different. However, these treatments resulted in significantly greater yields than spray treatments applied 6 or 9 weeks after die early spray stage. Mo application increased the N and Mo content of the leaves and protein content of the soybeans. A highly significant negative correlation occurred between protein and oil content of the soybeans when various Mo treatments were applied.

Key Words: seed treatment • growth stages • soil type • leaf-petiole

Received for publication May 17, 1968.