中玉四号是中国农科院品资所选育的中晚熟杂交种。1993～1994年参加北京市春播区试。1993年在30个参试品种中产量位居第二,比对照沈单七号增产33.4%,1994年在12个参试品种中产量位居第二,比对照农大六十增产87.4%,比掖单十三增产142.6%。产量水平为每亩650kg。中玉四号在北京春播生育期115天,株高290cm,穗位高130cm,千粒重300g,单穗粒重170g,籽粒为黄色半硬粒型,高抗青枯病毒、丝黑穗及大小斑病,抗倒伏,栽培密度为每亩4000～4500株。适应种植地区:北京、天津、河北、辽宁、山西、山东、河南、四川等地春播或夏播,在玉米病害多发地区尤宜种植。 Jade on the 4th is the Chinese Academy of Agricultural Sciences bred late hybrids. 1993 ~ 1994 to participate in Beijing spring broadcast area test. In 1993, the yield of 30 cultivars was the second, 33.4% more than that of the control Shendan 7, the second among the 12 varieties tested in 1994, and the yield was 87.4% more than that of the Nongda 60 Yeda thirteen increase production 142.6%. Production level of 650kg per mu. Zhongyu No.4 had 115 days of spring sowing date in Beijing with a plant height of 290cm, a panicle height of 130cm, a grain weight of 300g and a grain weight of 170g per spike. The grains were yellow and semi-hardy, resistant to bacterial wilt, Lodging, planting density of 4000 to 4500 acres per acre. Adaptation to planting areas: Beijing, Tianjin, Hebei, Liaoning, Shanxi, Shandong, Henan, Sichuan and other places sowing or summer sowing, especially in maize disease prone areas planted.