栽植樣式, 種子親 對 花粉親比率 및 密度가 단옥수수 單交雜種 採種量에 미치는 影響

Effects of planting pattern, seed to pollen parent planting ratio and density on seed yield of a single cross sweet corn hybrid

A new high-yielding single cross sweet corn hybrid, Danok 1, was developed at the Crop Experiment Station in 1983. Plant height, 100-kernel weight, and average ear weight of seed parent, KSS-1 are smaller than those of pollen parent, KSS-2. The ear length and diameter are similar in both inbreds. For optimum production practice of sweet corn hybrid seed, two, three and four rows of seed parent to one row of pollen parent were compared using interplanting and conventional planting methods of pollen parent, and with plant populations of 6,666, 8,000, 8,888 and 10,000 plants per 10 ares. The highest seed production planting pattern was one row of pollen parent to four rows of seed parent with 6,666 plants per 10 ares. For full utilization of limited land area for seed production and for placing the pollen parent closer to the seed parent rows, interplanting of pollen parent between normal seed parent rows and conventional four seed parent rows to one pollen parent row planting pattern also were high in hybrid seed production with 8,333 plants population per 10 ares. High direct effects on seed yield were detected for ear-bearing height, stem length, ears per plant and ear diameter of seed parent. High coefficients of determination for ears per plant, stem length of pollen parent and ear length with seed yield also suggest possible high associations of the seed parent’s yield components and pollen parent’s growth including stern length. It was determined as a recommendable practice to remove the pollen parent just after pollination was complete by cutting. Removing the pollen parent at this stage prevented grain formation of pollen parent and possible seed contamination at harvest. Competition with developing seed parent for nutrients or available moisture was minimized thus increasing kernel size and seed yield.