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玉米是我国的第三大粮食作物,它不但有丰富的营养价值,而且是畜牧业的重要饲料,又是轻工业、食品业等不可缺少的原料之一,目前我国大约有2300hm~2的种植面积,随着国家粮食政策的调整,加上人们对玉米的饲料价值和营养价值认识的提高,播种面积正有逐年增加的趋势。近20年来,人们比较重视小麦生产机械化的研究及其机具的开发,谷物联合收割机已彻底改变了收获小麦时面朝黄土背朝天的原始收获方式,而玉米的机收面积则很小,
As the third largest grain crop in China, corn is not only rich in nutritional value, but also an important animal husbandry feed, as well as one of the indispensable raw materials for light industry and food industry. At present, about 2300hm ~ 2 of cultivated area With the adjustment of the national grain policy and the improvement of understanding of the feed value and nutritional value of corn, the sown area has been increasing year by year. In the recent 20 years, people have paid more attention to the mechanization of wheat production and the development of its machinery. The grain combine harvester has completely changed the original harvesting mode of facing the loess back to the sky when harvesting wheat, while the harvest area of corn is very small,