黑土地区 meaning in Chinese

chernyye zemli

Research on the measure to water and soil erosion prevention in black earth area
黑土地区防治水土流失的对策研究
Effect of some special compound fertilizer on shajiang meadow soil
作物专用掺混肥在砂姜黑土地区施用的增产效果及效益分析
Spatial and temporal variability of soil quality in typical black soil area in northeast china in 20 years
20年来东北典型黑土地区土壤肥力质量变化