Phosphorus deficiency-Cotton

Symptoms
Growth is extremely stunted. Older leaves turn yellow and show a broad seam of dull grey green tissue along the leaf margin.

Reasons
Phosphorus deficiency As cottonseed contain large reserves of P, the early growth rarely suffers from its deficiency under field conditions. P-deficient seedlings show only poor root and shoot growth. Deficiencies rather occur when high nutrient demand at boll development cannot be matched.

Symptoms
Older leaves show chlorotic tissue with bronze to purple discoloration, starting at the marginal areas and spreading along the leaf veins. Tips and margins subsequently get necrotic and senesce prematurely.

Reasons
Phosphorus deficiency, leaf underside As cottonseed contain large reserves of P, the early growth rarely suffers from its deficiency under field conditions. Deficiencies rather occur when high nutrient demand at boll development cannot be matched.

Symptoms
Older leaves show chlorotic tissue with bronze to purple discoloration, starting at the marginal areas and spreading along the leaf veins. Tips and margins subsequently get necrotic and senesce prematurely.

Reasons
Phosphorus deficiency, leaf underside As cottonseed contain large reserves of P, the early growth rarely suffers from its deficiency under field conditions. Deficiencies rather occur when high nutrient demand at boll development cannot be matched.

Symptoms
Older leaves show a purple discoloration, starting at the interveinal areas and spreading all over the leaf blade. Numberous small, whitish spots are distributed irregularly over the leaf. They are separated by a reddish ring from the adjacent green tissue, Striking purple dots develop on the buds.

Reasons
Late season phosphorus deficiency As cottonseed contain large reserves of P, the early growth rarely suffers from its deficiency under field conditions. Deficiencies rather occur when high nutrient demand at boll development cannot be matched.