Potassium deficiency-Corn

Symptoms
The cobs of K-deficiency plants are narrowed and peaked. Grains in the cob tips are only poorly filled.

Reasons
Potassium deficiency Similar leaf symptoms may be caused by manganese or phosphorus deficiency, which also result in chlorosis, followed by necrosis. However, Mn deficiency is visible on younger leaves first. Magnesium deficiency causes interveinal chlorosis with necrotic zones later, too, but these are spread over the whole leaf area and do not concentrate on the leaf tip or margin. Salt stress due to overfertilization may also be a reason for marginal scorching.

Symptoms
Yellow/bronze stripes and spots occur on the marginal area between the veins. Leaf scorch starting on leaf tips and margins spreads over the leaf blade with progressing deficiency.

Reasons
Potassium deficiency Similar leaf symptoms may be caused by manganese or phosphorus deficiency, which also result in chlorosis, followed by necrosis. However, Mn deficiency is visible on younger leaves first. Magnesium deficiency causes interveinal chlorosis with necrotic zones later, too, but these are spread over the whole leaf area and do not concentrate on the leaf tip or margin. Salt stress due to overfertilization may also be a reason for marginal scorching.

Symptoms
Yellow/bronze stripes and spots occur on the marginal area between the veins. Leaf scorch starting on leaf tips and margins spreads over the leaf blade with progressing deficiency.

Reasons
Potassium deficiency Similar leaf symptoms may be caused by manganese or phosphorus deficiency, which also result in chlorosis, followed by necrosis. However, Mn deficiency is visible on younger leaves first. Magnesium deficiency causes interveinal chlorosis with necrotic zones later, too, but these are spread over the whole leaf area and do not concentrate on the leaf tip or margin. Salt stress due to overfertilization may also be a reason for marginal scorching.

Symptoms
The cobs of K-deficiency plants are small and peaked. Grains in the cob tips are only poorly filled.

Reasons
Potassium deficiency Similar leaf symptoms may be caused by manganese or phosphorus deficiency, which also result in chlorosis, followed by necrosis. However, Mn deficiency is visible on younger leaves first. Magnesium deficiency causes interveinal chlorosis with necrotic zones later, too, but these are spread over the whole leaf area and do not concentrate on the leaf tip or margin. Salt stress due to overfertilization may also be a reason for marginal scorching.

Symptoms
Cob size is reduced and filling on cob tip is not complete

Reasons
Potassium deficiency on cobs (right)