Sulphur is an important nutrient for optimum growth and productivity in -

Plants obtain sulphur in the form of sulphate ($SO_4^{2-}$).
Sulphur is present in the amino acids cysteine and methionine, and is a constituent of several coenzymes, vitamins (thiamine, biotin, coenzyme A) and ferredoxin.
Oilseed crops have a particularly high requirement of sulphur, because it is needed for the synthesis of oil and of sulphur-containing compounds.
For example, the pungent oils of mustard and other crucifers (glucosinolates) contain sulphur.
An adequate supply of sulphur increases both the seed yield and the oil content of oilseed crops such as mustard, groundnut and sunflower.
Pulses also respond to sulphur, but its importance for productivity is greatest in oilseeds.
So sulphur is an important nutrient for optimum growth and productivity in oilseed crops.