Is It Possible That My Ailing Pepper Plants Are Getting Too Much Water?

Question

Drip irrigation twice a day, morning and night, but only for about ten minutes

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Answer 1

That is likely. You should water, only, when the soil is completely dry down to about 2 or 3 inches between watering. This will not be on a schedule.

These articles will help:

https://www.gardeningknowhow.com/edible/vegetables/pepper

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm