玉米是一种生产成本低、用途广泛、栽培遍及五洲的粮食作物。其光合效率高,杂交优势强,潜在优势大,是其他作物不能比拟的。因此进入八十年代以来,在世界三大粮食作物生产中(即水稻、小麦、玉米)玉米的播种面积达到19.3亿亩,占第三位,而其年总产量7,881亿斤,占第二位.单产为408斤,占第一位。可见玉米作为高产稳产作物 Corn is a low-cost production, a wide range of uses, cultivation of food crops throughout the continents. Its photosynthetic efficiency, hybrid advantages, the potential advantages of large, can not be compared to other crops. Therefore, since the 1980s, the sown area of ​​maize in the world’s three major grain crops (ie, rice, wheat and corn) has reached 1.93 billion mu, ranking the third, while its annual output is 781.8 billion kilograms, accounting for the second place Yield of 408 pounds, accounting for the first place. Corn can be seen as high and stable yield crops