萧县大屯镇地处安徽的北部，每年种植夏玉米近4万亩，几年来产量一直徘徊在350～400公斤／亩。1995年我们联系50户，种植185亩，开展高产攻关，实现平均单产585公斤，最高单产632jk斤，打破了多年徘徊的局面，为夏玉米高产栽培积累了经验。其主要措施是“五改、三增”。一、五 Located in the northern part of Anhui Province, Datun, a town in Xiaoxian County, grows about 40,000 hectares of summer maize annually, hovering around 350 to 400 kg / mu for several years. In 1995, we contacted 50 households and planted 185 mu to carry out high-yield research to achieve an average yield of 585 kg and a maximum yield of 632 jk jin, breaking the years of wandering and accumulating experience for high-yielding summer maize. The main measure is “five changes, three increases.” One, five