I do aquaponics. Roots need to breathe also. If you are growing in just water, you need to aerate the water either by circulating or using an aquarium bubbler. Soil is like a sponge. If you water too much it doesn’t allow enough air for roots to breathe. If you have proper drainage, allow the soil to dry some or have a medium that doesn’t pack as tight as soil, roots can breathe
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