When corn plant leaves turn yellow that way, it is usually due to a soil moisture problem. Soggy wet soil, even for a short time, excludes oxygen and results in root death and decay. Dry soil also damages roots and can be followed by yellowing leaves. Sometimes changes in a plant's location and therefore its temperature and sunlight exposure can significantly change the amount of water a plant uses.
Watch the watering and they should bounce back in a few weeks. I like to feel the soil an inch or two below the surface as a gauge to watering. When it no longer feels moist, it should be time to water again.
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