Molybdenum

Molybdenum plays an important role in nitrogen metabolism within the plant. It is involved with nitrogen fixation in legumes. It also plays a role in pollen viability and seed production.

Early deficiency symptoms are similar to nitrogen or sulfur deficiency. Affected plants become stunted and lack vigour. Leaves may turn brown along the margins. There are significant differences in sensitivity to low levels of molybdenum between plants and even between varieties of plants.

There is no OMAFRA-accredited soil molybdenum test. Deficiencies are best confirmed with a plant analysis. Molybdenum availability improves with increasing soil pH. Liming can improve the availability on acid soils. Deficiencies may also occur under low soil moisture conditions.