Answer: How much water to apply and how often really depends upon your soil type, the weather, and how much water each of your emitters puts out. In general, the roots of a tomato plant are 12" deep so you want the water to penetrate that far. I would water for 15 minutes in the morning and 15 minutes in the evening every 3-4 days. Try this for a week and then dig down to make sure the water is penetrating deeply enough.
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