The die-back disease in Citrus is due to deficiency of . . . . . . .

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

Assertion : Deficiency of sulphur causes chlorosis in plants.
Reason : Sulphur is a constituent of chlorophyll,protein and nucleic acids.

Grey spots of oat are caused by the deficiency of:

On the basis of symptoms of chlorosis in leaves,a student inferred that this was due to the deficiency of nitrogen. This inference could be correct only if yellowing of leaves appeared first in

Name the deficiency symptoms shown by plants and their causative elements.