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 |
|
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5 宁南山区粮食单产的变化 |
| Fig.5 Changes of grain yield per unit in Central and Southern Mountainous Areas of Ningxia |
|
|