随着市场经济体制的确立,北京作为快速发展的国际化大都市,消费结构趋向多元化,对农产品提出了高层次、多样性和个性化的新需求。近年北京郊区农业加速结构调整,开始向高效利用资源的高科技、高效益方向发展。玉米作为全市第一大粮食作物(在粮食面积和总产量年趋锐减的情况下,2003年玉米种植面积和总产量仍分别占粮食作物的54.4％和56.9％),近年来也随之向 With the establishment of a market economy system, Beijing, as a rapidly developing cosmopolitan city, has a diversified consumption structure and has put forward new demands for high-level, diversified and individualized agricultural products. In recent years, the agricultural acceleration in Beijing’s suburb has begun to adjust itself to the high-tech and cost-effective use of resources. As the largest grain crop in the city, corn (54.4% and 56.9% of the total grain output in 2003, respectively, even though the area and total output of rice dropped rapidly in recent years)