Top rot of tobacco is due to deficiency of

'Khaira disease of rice' is due to

'Petiole crack' is caused by the deficiency of

Which of the following mineral deficiencies will cause death of stem and root tips?

It is observed that the deficiency of a particular element shows its symptoms initially in older leaves and then in younger leaves. Name two elements that are highly mobile and two that are relatively immobile.

Which of the following is deficient in the soil of Gujarat,$U$.$P$.,and Maharashtra in a large area?