掖单12号是山东省莱州市农科所1987年选育出来的,株型紧凑、果穗较大,是当前综合性状最好的一个玉米新品种,组合为478×515。1990年引进我所进行小面积高产试验,获得745.3公斤/亩的产量,超过了我所玉米高产记录。1990-1991年两年进行了密度和肥料试验,为以良种良法相结合,迅速地在我区大面积推广提供科学依据。一、播种技术:掖单12号是中熟品种,要抢时早播,于6月15号以前播种结束,最好是麦垄套种。播种量是每亩5斤,种植的适宜密度是每亩 Yedang 12 is the Shandong Academy of Agricultural Sciences Laizhou City, bred in 1987, compact plant type, large ears, is the current best overall performance of a new variety of maize, a combination of 478 × 515. I introduced in 1990 A small-area, high-yield test was conducted, yielding 745.3 kg / mu, surpassing our high yield record for maize. During the two years of 1990-1991, the density and fertilizer tests were conducted, providing a scientific basis for the promotion of large-scale popularization in our region with the combination of good and good methods. First, the sowing technology: Yedang No. 12 is a medium-maturing varieties, to grab the early sowing, sowing before the June 15 end, the best wheat Ridge interplanted. Sowing rate is 5 pounds per mu, planting suitable density is per acre