玉米杂交种掖单四号,株型紧凑,叶片上冲,适于密植。一般亩产500公斤左右,最高达750公斤。 掖单四号玉米全生育期的干物重变化分三个阶段,初期缓慢增长,其生长量约占全生育期的10％,中期迅速生长,这一阶段干物质生长量约占全生育期的80％以上,但穗重尚低;后期干物质增长虽不到全生育期的10％,但由于干物质迅速转移到穗部,穗重有较大的增长。全过程在华北中部地区正常年景下为105天左右。在正常条件下,该品种抽雄受 Maize hybrid Yedan IV, compact plant type, the leaves on the red, suitable for close planting. Generally about 500 kilograms per mu, up to 750 kilograms. The dry matter weight change of Yedan No.4 maize in its whole growth period is divided into three stages, the initial growth slowly, its growth accounts for about 10% of the whole growth period, medium-term rapid growth, dry matter growth in this stage about the whole growth period 80%, but the panicle weight is still low. Although the dry matter growth at the later stage is less than 10% of the whole growth period, due to the rapid transfer of dry matter to the panicle, panicle weight has a greater growth. The whole process is about 105 days under normal conditions in the central part of North China. Under normal conditions, the variety tasseled by