Q.Why Are My Transplanted Starter Squash, Cucumber, And Okra Plant Leaves Turning Yellow? I Am From Richmond, TX And Planted In Raised
beds I water twice a day and feed them Miracle Gro liquid yesterday.
Certified GKH Gardening Expert
Unless you, absolutely, have to water twice per day (i.e. a meter tells you that the soil is dry down to about 3 inches) I would say that it is remaining too moist without a dry out. This can cause poor nutrient uptake, or cause soil infections that will cause the soil to be way to acidic to support plant life, but allow bacteria to flourish.
I see, what looks like, the start of a magnesium deficiency. This can indicate an actual magnesium deficiency, or low soil pH.
First, I would recommend testing the pH and nutrient content:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
You can amend, accordingly, once you see what the soil's profile looks like.
Here are some more articles that will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/adding-lime-to-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/fixing-magnesium-deficiency.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/tips-for-growing-squash.htm
https://www.gardeningknowhow.com/edible/vegetables/cucumber/tips-for-growing-cucumbers.htm
https://www.gardeningknowhow.com/edible/vegetables/okra/planting-okra.htm