Getting Strawberries and Melons to Make Sugar (Be Sweet)

Question

I am not having good luck raising either sweet strawberries, cantaloupes or watermelons. In Mississippi clay soil, we grew wonderful melons, but although the melons get ripe, they just don’t seem to get really sweet. Any suggestions?

The soil here is more sandy than in MS, but not particularly more organic. We keep plowing the organic material back in . . . and we do fertilize.

Answer 1

These articles will help: https://www.gardeningknowhow.com/edible/fruits/strawberry/sweet-strawberries.htm
https://www.gardeningknowhow.com/edible/fruits/melons/growing-melons.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-improve-clay-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/amending-sandy-soil.htm