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2 宁南山区粮食作物产量在宁夏全区所占比重的变化

Fig.2 The change of the proportion of yield of grain crops in the whole Ningxia region