普及推广玉米杂交种,是一项经济有效的增产措施。当前生产上应用的一批优良单交种,具有早熟、高产、稳产等优点。但制种产量低、成本高、种子价格贵。据沧州地区统计,1973年至1979年玉米单交种制种田亩产仅112.2斤,一亩制种田还不能满足二十亩地用种,因此,使全区玉米杂交种种植面积,十几年来徘徊在50%左右,生产上还有一半面积种植的仍是低产农家种和越代杂交种。据此,我们把选育产量和主要农艺性 Popularizing and popularizing corn hybrids is a cost-effective stimulant. The current production of a group of excellent single cross-species, with precocious, high yield, stable yield and so on. However, seed production is low, the cost is high, and the seeds are expensive. According to Cangzhou statistics, from 1973 to 1979 corn monoculture farming only 112.2 kg per mu, one acre of farming can not meet the 20 acres of land use, so that the area of ​​corn hybrids planted area, more than a decade Hovering around 50%, half of the production is still planted with low-yielding farmers and cross-generation hybrids. Accordingly, we put the yield of breeding and the main agronomic