“洛单903”是洛阳市农科所1989年以新白5003作母本,自选系沈219—1作父本组配而成的高产、稳产、多抗淀粉型白粒玉米杂交种。1991和1992两年在河南省区域试验平均单产526.9公斤,比对照沈单七号增产5.9％;1993年河南省玉米生产示范平均亩产530.9公斤,较对照沈单七号增产9.2％,位居第一。1994年4月通过省品种审定委员会审定,定名为豫玉13。 “Luodan 903” is a high-yielding, stable-yielding and multi-resistant starch-type white grain corn hybrid that Luoyang Agricultural Science Institute used as the male parent of Xinbai 5003 in 1989 and Shen 219-1 of the selected family. In 1991 and 1992, the average regional yield in Henan Province was 526.9 kg, an increase of 5.9% over that of the control Shendan VII. In 1993, the average yield per mu of corn production in Henan Province was 530.9 kg, which was 9.2% higher than that of Shen-7 the first. In April 1994 through the provincial variety validation committee validation, named Yu Yu 13.