丰31号由中国农科院植保所1974年育成,是一丰产又抗矮花叶病的三交种,组合为郑单2号(唐四平头×获白)×自330。1976年经河南省玉米会议同意大面积制种,1982年经山东省农作物品种审定委员会审定。特征特性丰31号生长健壮,叶色浓绿,株高220—290厘米,穗位高110—130厘米,在河南省夏播生育期92—96天。果穗长锥形,穗行约14行,行粒数30—35。籽粒黄白色,半马齿形,百粒长114厘米,千粒重300—370克。抗矮花叶及大、小斑病,此外还兼耐丝黑穗、散黑穗、青枯及锈病。丰产性好。1979年山西省夏玉米区试,平均亩产909.8斤,比对照种中单2号增产10.9%;1979年山西省春玉米区试,平均亩产1,198 Feng 31 by the Chinese Academy of Agricultural Sciences Institute of Plant Protection bred in 1974, is a high yield and resistant to short mosaic disease three cross combinations, the combination of Zheng Dan No. 2 (Tang Siping × × white) × from 330 1976 by Henan Provincial corn meeting agreed to a large area seed, in 1982 by the Shandong Provincial Crop Variety Approval Committee. Characteristic characteristics Feng 31 grow robust, dark green leaves, plant height 220-290 cm, ear height 110-130 cm, 92-996 days in Henan Province during summer sowing. Ear long conical, spike about 14 lines, line grain number 30-35. Grain yellow and white, half-dentate, one hundred length 114 cm, 1000 grain weight 300-370 grams. Anti-dwarf mosaic and large and small spot disease, in addition to endure resistance black smith, scattered black, blue and rust and rust. High yield good. 1979 Shanxi Province, summer maize area test, the average per mu yield of 909.8 kg, compared with the control of single No. 2 increased by 10.9%; Shanxi spring corn area trial in 1979, the average yield of 1,198