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前言春玉米是呼盟岭东南旱作丘陵区的第一大作物,历年种植面积占当地粮豆面积的30％以上,它的产量高低直接影响着当地粮食作物的总产量和农民的收入。长期以来,该地区的玉米亩产多在300斤左右徘徊,增长缓慢。低产主要原因是耕作粗放、密度过稀、施肥
Introduction Spring corn is the first crop in the hilly region of the Hulongling southeastern part of China. Its annual acreage accounts for more than 30% of the area of the local grain bean. Its yield directly affects the total output of local grain crops and the income of farmers. For a long time, the yield per acre in the area has been hovering around 300 kg, increasing slowly. The main reason for low yield is extensive farming, too thin density, fertilization