I'm afraid that's a 'how long is a piece of string' question.
It depends on location of land, state of land, type of grass, health of the soil...
As an example the yield from one of our fields can nearly triple after the application of lime to correct the acidity and then a good dose of fertiliser to improve the potassium, phosphate and magnesium.
To get a reasonable answer you will need to give a bit more info.
Sue