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Moisture

Earlier flowering corn will always yield more than late flowering corn in hot, dry seasons due to subsoil moisture availability during the moisture-critical, stress-susceptible flowering period. Because subsoil moisture decreases over time, earlier flowering corns have more subsoil moisture available when flowering, than do later flowering corns.

Heat

Heat usually damages corn first at the top of the plant, then progresses downward, because younger, more succulent tissue is at the top, because less shade is at the top, and because the top is the farthest from the water source.