紧凑型玉米及 高产配套技术推广 “九五” 期间，我省积极推广实施国家重中之重科技成果推广项目“紧凑型玉米及高产配套技术研究与推广”，以推广“一换（更换良种）、二增（增加密度和肥料）、三改（改单施氮肥为氮磷配方施肥、改氮肥‘一炮轰’为２－３次施、改收获期过早为 During the “Ninth Five-year Plan” period, the province actively promoted the implementation of the “Research and Promotion of Compact Corn and High-yielding Supporting Technologies”, a project focused on promoting scientific and technological achievements that is the country’s most important priority, in order to promote "one change (replacement of elite seeds) , Two increase (increase density and fertilizer), three changes (change nitrogen fertilizer for nitrogen and phosphorus formula fertilization, nitrogen fertilizer ’a shelling’ for 2-3 times, change harvest early too