Potassium deficiency - Rye

Symptoms
Young leaves are blueish green, the older ones show chlorotic tips and margins, followed by necrosis.

Reasons
Potassium deficiency

Symptoms
Leaves are blueish green with chlorotic tips and margins. Growth is reduced due to shortened internodes as deficiency becomes more severe.

Reasons
Potassium deficiency Mild damage from herbicides may give similar symptoms.

Symptoms
Yellow-white streaking of leaves is one of several possible symptoms of K deficiency. Normally Potassium deficiency results in a characteristic pattern of leaf discoloration by small whitish-yellow spots, followed by scorching or browning of the leaf edge of lower, older leaves.

Reasons
Potassium deficiency

Symptoms
Potassium deficiency results in a characteristic pattern of leaf discoloration by small whitish-yellow spots, followed by scorching or browning of the leaf edge of lower, older leaves. Intercostal chlorosis occurs toward the leaf base. Young leaves show a blue tint.

Reasons
Potassium deficiency

Symptoms
Leaves with P deficiency are smaller than normal and show purple tints on their dark green leaves, especially on the middle of the leaf blade. K deficient leaves are even more stunted and their tips are scorched.

Reasons
P and K deficiency vs. optimum supply Spring cereals may show reddening/purpling of older leaves in cold weather. Root and stem damage or poor soil consolidation can cause similar symptoms, too.