Nutrient Deficiency in Squash

I planted two varieties of squash plants only a few yards from each other while watering each variety identically and caring for them identically. The only difference is the type of soil they are grown in. Since one variety looks healthy while the other looks variety looks sickly, I'm assuming the bed with the sickly plants is deficient in a key nutrient since I got the seeds for these squash plants from a gardener who already had good experience for this squash landrace. As a precautionary measure, I side-dressed the squash plants with garden fertilizer this evening to give the plants an extra nutrient boost over the next few weeks. I'm hoping the plants perk up before they get detroyed by powdery mildew.

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