How will the filtration rate in the renal corpuscles be affected if a kidney stone creates a blockage of the urinary tract?

There will be a progressive fall in glomerular filtration rate.

Explanation:

The glomerular filtration rate, GFR, shows how well the Kidney is functioning or working. When the Kidney is not working well, it doesn't filter the way it should.

Note that, Glomerular filtration is the process of removing wastes and excess fluid to become part of the urine, by the kidney.