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Optimum Plant Populations of a Super Sweet Corn Hybrid at Different Planting Date

A super sweet corn hybrid, “Cambella 90”, was grown at 5 plant populations (35,000, 45,000, 55,000, 65,000, 75,000 plants/ha) on 1 April, 1 May, and 1 June in 2004 under black polyethylene (P. E.) film mulch to find out the optimum plant populations at different planting dates. Emergence rate and percent stand increased as planting dates delayed. Culm length and ear height were highest at the planting on 1 May and increased with increased plant population. Soluble solids content was highest at the planting on 1 May and decreased as plant population increased. Ear length, seed set ear length, ear diameter, and ear weight decreased as plant population increased. Seed set ear length could not substitute for ear weight to evaluate marketable ears. The optimum plant population of “Cambella 90” was 65,000~75,000 plants/ha at the planting on 1 April when emergence rate was low due to low temperature, 55,000~65,000 plants/ha at the planting on 1 May, and 65,000 plants/ ha after the planting on 1 June.