Potassium

Question 1

Potassium

Mobility

Answer 1

Molbile

Older leaves affected first.

Question 2

Potassium

Signs of deficiency

Answer 2

Marginal leaf scorch
Reduction in yield and growth
Mottled chlorosis
Small, bronzed leaves
Inward curling leaves.

Question 3

Treating deficiency

Answer 3

Sulphate of potash

Question 4

Excessive potassium

Answer 4

Causes ionic antagonism with magnesium.
Reduces magnesium uptake.
Causes magnesium deficiency.

Question 5

Causes of potassium deficiency

Answer 5

Soils that are continuously cropped and not adequately fertilised often show sign of deficiency.

Sodium and calcium in plant tissue often obscure potassium deficiency.

Question 6

Potassium

Rôle

Answer 6

Involved in enzyme activation within plant - affects protein, starch and ATP production.