豫玉20号（原名豫单15号）是由河南农业大学玉米研究所1990年以自选系S。。作母本，外引系478作父本组配而成的竖叶大穗型杂交种。1996年4月通过河南省农作物品种审定委员会审定，并命名。产量表现该杂交种高产潜力大，稳产性能高，1993年参加河南省区试，名列第一，11个试点全 Yu Yu No. 20 (formerly Yu No. 15) by the Institute of Maize Henan Agricultural University in 1990 to S system. . As the female parent, the outer lead line 478 was paired with the parent leaf large panicle hybrid. In April 1996 through the Henan Province Crop Variety Approval Committee validation, and named. Yield performance The high yield potential of hybrids, stable high performance, in 1993 to participate in the Henan provincial test, ranked first, 11 pilot