Beginner Gardening: Can anyone offer some advice?, 1 by FattyMattyPA

FattyMattyPA wrote:
This is my 4th year with a garden. Each year my garden has been on a different plot of land (I've moved 2x, and at my current home I've changed plots 2x).

So a local farmer is a friend of mine and I picked up about 15 plants (tomato, cucumbers, cantaloupe, broccoli, watermelon, peppers, etc). These plants were healthy when I brought them home. I also germinated my own beans, peas, broccoli, cucumber, etc, and prior to transplants these plants were very healthy as well.

The problem is, my cucumbers, cantaloupe, and peppers (both my homegrown and the my farmer's variety) are limp, withering, and yellowing. I amended my naturally sandy soil with humus, manure, and homemade compost. We just had some really rainy weather followed by 2 days of 85 degree days, so the soil was slightly damp when I checked it today.

I haven't tested the pH this year, but last year it was slightly acidic. I just don't know what to do. I worked so hard to make sure the soil has all the best qualities but I still have dying plants. The cantaloupe is almost dead. I've never had veggies die on me in 4 years. HELP!