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原单20由吉林省原种繁殖场农科所1991年育成,组合120×杂C546。该品种为早熟品种,出苗至成熟119d,需要≥10℃活动积温2250℃。1992～1998年参加各类试验均表现高产、稳产、优质和抗倒伏。在每公顷55万株密度下,平均公顷产量73922kg,比海玉4号增产149%。适宜在吉林省东部半山区、黑龙江省第三积温带及内蒙古东北部地区中上等肥力地块种植。清种密度一般每公顷50万～55万株为宜。
The original single 20 was bred by the Jilin Provincial Bureau of Primary Breeding Farm in 1991, a combination of 120 × Miscellaneous C546. The varieties of early maturing varieties, emergence to maturity 119d, need ≥ 10 ℃ active accumulated temperature 2250 ℃. From 1992 to 1998, all kinds of tests showed high yield, stable yield, high quality and lodging resistance. At a density of 550,000 trees per hectare, the average yield per hectare was 73,922 kg, an increase of 149% over that of No. 4 in Haoyu. It is suitable for cultivation in middle-upper fertile land in the eastern half of Jilin Province, the third accumulated temperate zone in Heilongjiang Province and the northeast of Inner Mongolia. Clear seed density generally 500,000 to 550000 per hectare is appropriate.