The northwest ecological agriculture region is defined in the proportion of 0.2% every year;
对西北部生态农业建设区确定粮食作物播种面积每年压缩0.2％的合理比例；
Agriculture and communication were the important parts during the development of the northwest area in YUan dynasty.
元代西北经济开发的重点是农业和交通建设。
The new maize variety Shaandan 21 (Shaandan 9704) was bred by the male Wu 464 and the female K22 in Maize Institution, Northwest Sci-Tech University of Agriculture and Forestry in 1997.
陕单21号（陕单9704）由西北农林科技大学农学院玉米研究所1997年以自交系武464和K22杂交育成的早熟玉米新品种。
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