To find out the planting times for the economic yield of a super sweet corn hybrid, “Cambella 90” was planted from 1 April of 2003 and 2004 at the 10 days intervals under black polyethylene (P. E.) film mulch and in bare soil in Gyeongsan. Daily maximum soil temperature under black P. E. film mulch was lower, while daily minimum soil temperature was higher compared to bare soil. Soil moisture content under black P. E. film mulch maintained optimum level longer than in bare soil. Emergence rate, percent stand, culm length, and the number of marketable ears were higher under black P. E. film mulch compared to bare soil. Silking date under black P. E. film mulch was earlier compared to bare soil by 4~6 days at April plantings, while only 1 day earlier at June plantings. Silking date of individual plants in a plot ranged 3~5 days depending on planting dates and soil mulch in the same plot. The number of large ears decreased as planting dates delayed. Considering emergence rate and the number of marketable ears, the planting time for the economic yield of a super sweet corn hybrid, “Cambella 90” ranged 1 April to 20 June in the southern part of Korea.
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