Boron

Deficiency Symptoms :

Young and middle leaves of plants develop small chlorotic patches.  Chlorotic patches become more pronounced and develop orange coloured necrotic areas in young leaves.  Shoot apex of plants may turn necrotic and cease to grow.  Young leaves show severe curling and distortion.  This leads to appearance of side branches bearing small leaves.  Eventually all the young leaves turn necrotic.

Spray of Borax (0.2%) on capitulum at ray floret opening stage for increasing seed filling, Yield and oil content.