雄株間播 및 栽植密度가 交雜種 옥수수 種子親의 生育 및 採種量에 미치는 影響

Effects of Solid Planting and Planting Densities on the Growth and Seed Yield of Seed Parent in Hybrid Corn

Solid planting or male-interplanting method has been used successtully in hybrid seed production in Korea since 1978. However, some managerial disadvantages such as side-dressing, weed control and detasseling were resulted in due to narrower distances between male and female rows. Studies were made to understand the effects of planting patterns and popuation densities on the growth and seed production of parental inbred of maize single cross. Solid planting and 1:2 planting patterns were compared in three population densities ranging from 5,000 to 8,300 plants of seed parent per 10 ares. Tasseling and silking dates were not affected by planting patterns or population densities, but plant height seemed to higher at higher population densities. Seed production was higher in solid planting than 1: 2 planting pattern under the same popuation density. But the yield advantage of solid planting was not obseved when population density of seed parent was similar in both planting patterns. A significant increase of seed production was obtained at 8,300plants of seed parent per 10 ares However, seed size was smaller at higher densities. Number of ears per unit area, number of kernels per ear and 100 kernel weight were important yield components determining seed yield.