20年来宁夏中南部山区农业生产发展分析
Analysis on the Development of Agricultural Production in Central and Southern Mountainous Areas of Ningxia in Recent 20 Years
20年来宁夏中南部山区农业生产发展分析 |
| 崔勇,马自清,田恩平 |
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Analysis on the Development of Agricultural Production in Central and Southern Mountainous Areas of Ningxia in Recent 20 Years |
| Yong Cui,Ziqing Ma,Enping Tian |
| 图4 各主要粮食作物播种面积的变化 |
| Fig.4 Changes of sowing area of main grain crops |
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