早熟玉米新品种克玉22的选育及配套栽培技术OA

In order to facilitate the promotion and application of Keyu 22,a new early-maturing maize variety,and to support the corn industry in the Third Accumulated Temperature Zone of Heilongjiang Province in achieving quality improvement and efficiency enhancement,this paper briefly introduces the parental origin,breeding process,characteristics,yield performance of this variety,and outlines the key points of supporting cultivation techniques.Keyu 22 is a new early-maturing maize variety developed by the Keshan Branch of Heilongjiang Academy of Agricultural Sciences in 2014.It was bred via artificial cross-pollination,with the self-bred elite inbred line HB410 as the female parent and the self-bred stable inbred line HA638 as the male parent.From 2018 to 2019,it participated in the regional trials of the Heilongjiang Maize Consortium,covering multiple test sites in the Third Accumulated Temperature Zone of the province.The average yield reached 9 563.7 kg·ha-1,representing an 8.9％increase compared to the control variety Xinkeyu 2.In 2020,it participated in the production trials of the Heilongjiang Maize Consortium,with an average yield of 10 785.2 kg·ha-1,a 6.1％increase over the control variety Keyu 19.In 2021,this variety was certified by the Heilongjiang Crop Variety Approval Committee,with the certification number Heishenyu 2021L0036.Keyu 22 exhibits prominent core advantages,including excellent earliness,high yield potential,superior grain quality,and strong stress resistance.It is suitable for cultivation in areas of the Third Accumulated Temperature Zone of Heilongjiang Province where the active accumulated temperature ≥ 10 ℃ reaches 2 300 ℃.