Answer: Yellowing leaves on squash plants is quite common and can be caused by a variety of things, including transplant shock, over or under-watering and lack of nitrogen. Zucchini like rich, moist soil that's has plenty of organic matter and drains well. They need nitrogen at the start of their growing for green healthy leaves. Try fish emulsion for an organic source of nitrogen or use a balanced fertilizer, e.g., 10-10-10. Follow package instructions for application rates. Water well before and after applying.
Squash are moisture sensitive and need a regular supply of water to thrive and produce fruit. How often to water depends on your particular soil's characteristics. You want to keep it uniformly moist, but not soaking wet, to a depth of 12-18 inches. I hope this information helps with your zucchini!
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