Premature leaf fall is due to deficiency of

Grey spots of oat are caused by the deficiency of which element?

Which deficiency causes the disease anemia?

'Mottled chlorosis' on the leaves occurs due to the deficiency of

It is observed that the deficiency of a particular element shows its symptoms initially in older leaves and then in younger leaves. How is the aspect of mobility of elements important to horticulture and agriculture?

Yellowish edges appear in leaves deficient in $....$