Mustard is a oil sed crop so sulphar give better results
but Ammonium sulphate provide 20% nitrogen along with 28% sulphar which increase vegetative growth as well as quality of seeds.So Ammonium sulphate is more better as compared to bentomine sulphate.
Agreed with Kalpeshkumar Vithalbhai Patel and at the same time I would like to include SSP as better source for providing both P & S which is more economical in terms of yield.
Dear Eetela Sathyanarayana thank you for your interesting technical question. For more information about this please have a look at the following relevant articles:
1. Effect of sulphur fertilisation on yield and quality of white mustard seeds
Article Effect of sulphur fertilisation on yield and quality of whit...
2. Effect of ammonium sulphate and DAP on yield and sulphur and phosphorus uptake by mustard
Article “Effect of ammonium sulphate and DAP on yield and sulphur an...
Both articles are freely available as public full texts on ResearchGate.