If you aren’t getting a soil test done you should really look at finding out what your PH level is like. I’ve done my own test which you can see below, plus I already have it on the soil test I had done.
This is great thing to do for any garden as you need to get the soil in the best condition for whatever you are growing, different plants prefer different PH levels. For giant pumpkins they prefer a range of usually 6.5 to up to 7
I updated the video I made a couple of years ago about PH Soil testing at home using a kit you can buy from a garden centre, check it out if you need to know more about PH testing.