Molybdenum Deficiency in Soybeans

Symptoms of Molybdenum Deficiency in Soybeans

Molybdenum deficiency symptoms frequently resemble Nitrogen deficiency. Older and middle leaves become chlorotic first, and in some instances, leaf margins are rolled and growth and flower formation are restricted.

Molybdenum Deficiency in Soybeans

Molybdenum Deficiency: Middle leaves are first to become chlorotic

See Additional Deficiencies:

About Molybdenum

Molybdenum is needed by the plant in the synthesis and activation of nitrate reductase, an enzyme that reduces nitrate to ammonium in the plant. It is also required for symbiotic fixation of Nitrogen within legume root nodules and for the conversion of inorganic Phosphorus to organic forms in the plant. Unlike other micronutrients, Molybdenum availability in the soil increases with higher soil pH. Sandy soils are more likely to be deficient in Molybdenum. Heavy Phosphorus fertilization can increase Molybdenum uptake by plants from the soil, while Sulfur fertilization reduces Molybdenum uptake.

Functions of Molybdenum

  • Nitrogen fixation and metabolism
  • Iron and Phosphorus metabolism

Molybdenum Deficiency is Made Worse By:

  • Low pH