Magnesium Sulphate:-
MgSO4.7H2O
Content 

Mg :- 9.6 % Min Sulphur – 13 % Min

Dose
Soil application / Fertication :- @ 10 to 25 Kg per acre depending upon deficiency in the soil & crop response to Magnesium.
Packing 

1 Kg, 25 Kg