could any one help me my adviser said its possible to grow a good crop of hay from rvp grass using only urea + the required p&k without using any sulpher.

also does anyone know where i could find a seed cleaner any make or model.

Yes N, P & K will be fine on their own.

Why does your adviser not want you to use any S?

Not sure about the seed cleaner, but I think there is another thread on seed cleaning already running, so you could have a look.

Might be in "Talking Tackle", and maybe not.