1 不同玉米品种增产潜力不同在玉米生产中,任何栽培措施都是紧紧围绕玉米品种进行的,玉米的增产潜力与品种是密切相关的。品种自身的遗传力不高,其它栽培技术再好产量也不会高。目前,在生产上使用的玉米品种多数都是株型繁茂、叶片平展的普通型玉米杂交种。这些品种的致命弱点就是不耐密植,一般每公顷种植密度只有4.5 1 different maize varieties have different potential for yield increase In corn production, any cultivation measures are closely around the corn varieties, and the yield potential of maize is closely related to the varieties. Heritability of varieties is not high, no matter how good other cultivation techniques yield. At present, most of the maize varieties used in production are common maize hybrids with extensive plant types and flat leaves. The fatal weakness of these breeds is impatience, which is generally only 4.5 per hectare