黄片视频一级国产,8x网站在线观看,91精品国产99久久久久久无码,国产不卡免费无码视频

Jingning County is located in the east of Gansu Province, located in the hilly and ravines of the Loess Plateau, and the soil is mainly loess, accounting for 91.18% of the county's soil area. THE ORGANIC MATTER CONTENT IN THE SOIL WAS 0.92, THE TOTAL NITROGEN CONTENT WAS 0.072, THE AVAILABLE PHOSPHORUS WAS 8.24PPM, AND THE AVAILABLE POTASSIUM WAS 170.1 PPM.