In Iowa they call it “black gold” – a fertile blanket covering ... mulch with sand and silt to form a nutrient-rich type of soil called loam. It gave Iowa one of the most fertile soils ...
Chinese scientists have developed tailored cultivation techniques and conservation measures for the black soil in the country's northeastern provinces to support food security and ecological ...
Chinese scientists have developed tailored cultivation techniques and conservation measures for the black soil in the country's northeastern provinces to support food security and ecological safety, ...