sorry I am not sure if this is the right place to put this question but since I didn't see a section for soil and the spot in question is for veggies I figured that this is as good a spot as any.
I started gardening on my slope 2 years ago. There is one section that I am having troubles with. the first year I don't remember adding anything to the soil, some zucchini just happened to start growing there and so I added more in a line, it grew beautifully until temps reached about 110, maybe slightly more then I noticed the new leaves that were growing wouldn't unfurl all the way and they would be twisted, same with the flowers, until they wouldn't open at all and just be a hunk of mess, I was told that it was just because of the heat. last year I added manure to the whole garden (not just the one section) the rest of the garden grew beautiful but that one area was stunted, nothing got very big and got very few (very small) crops from it. now I am wondering if something got into the dirt, I have no clue what or how to even find out.
oh and that one section is about 2-3 foot wide by about 15-20 feet long.