Planting corn to a depth of 1½ to 2 inches is optimum for nodal root development.
Corn planted too shallow:
Symptoms of Irregular Planting Depth:
Pioneer on-farm surveys have shown that uniform plant spacing maximizes yield.
Grain yield of individual plants by position relative to skips and doubles (30,000 plants/acre)
Nafzinger, E.D. 1996. Effects of missing and two-plant hills on corn grain yield. Journal of Production Agriculture 9:238-240.
Pioneer studies show that individual plant yield reaches a maximum level when plants are within 2-3 inches of perfect equidistant spacing.
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