Potassium deficiency
Nutritional Disorder
Symptoms
Since potassium is very mobile within the plant, symptoms only develop on young leaves in the case of extreme deficiency. Tip burn symptoms, leaves become dark green and erect. Bolting promoted. Older leaves become yellow and necrotic.
Control
If K Deficiency occurs in the mid growth stages, K deficiency may be corrected with foliar application of KNO3 or K2SO4 @ 0.5-1.0 % K twice at weekly interval.