Abstract: In order to study the effects of different sowing dates on growth, flowering period, and yield of the parents of black waxy corn （Zea mays L.）variety Guiheinuo 609, based on the climatic characteristics of Guangxi, six sowing dates （Feb. 25 and 29, Mar. 4 and 8 for the male plant; Feb. 25 and Mar. 8 for the female plant） were designed by using the Heinuo 102 and Lyugannuo （the parents of Guiheinuo 609） as experimental materials. The occurrence time of growth periods, leaf growth rate, and yield traits of the parents were measured. The results showed that the flowering period of the parents was delayed during the retarding sowing date. It was the best for the occurrence of pollening stage of the male and silking stage of the female at the same sowing dates （Feb. 25 and Mar. 8）, and it occurred generally or did not occurre at different sowing dates. The fastest leaf growth rate and the longest tassel occurred in the early sowing parents （Feb. 25）. And in the retarding sowing dates, the parents’ plant height, ear position height, ear length, and kernel line number were gradually increased without significant difference, as well as their ear diameter, seeding rate and yield were gradually increased with a significant difference（P<0.05）. In conclusion, in order to ensure the florescence of the male and female parents meet normally and avoid the influence of temperature, it was best to focus on the simultaneous sowing date during seed production of Guiheinuo 609, and the most suitable sowing date should be early March, but should not exceed mid-March in Guangxi.

Key words: black waxy corn（Zea mays L.）, Guiheinuo 609, sowing date, male parent, female parent, florescence, yield