Current recommendations are to plant corn seed 1.5 to 2 inches deep. If planting conditions are dry. planting to moisture is often practiced to help with uniformity of emergence, but this may be affected by soil texture. In heavy soils, corn seed should not be planted deeper than 2.5 inches regardless of the conditions. In lighter, sandy soils, planting 3.0 inches deep may be necessary. Some states recommend planting shallower in no-till conditions. Planting shallower than 1.5 inches might affect corn growth and development with some herbicides like Prowl.
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