Worldwide, 75 billion tonnes of soil matter are lost due to wind and water erosion every year. | |
Cumulative loss of productivity due to soil degradation during the post-Second World War period: -Cropland -Rangeland |
12.7% 3.8% |
Percentage of yearly burned savanna in Africa | 30% - 50% |
Average annual soil formation rate | 1 t/ha |
Estimates of average annual soil loss through soil erosion on cropland in Africa, South America and Asia | 30 - 40 t/ha |
Estimated soil nutrient depletion of agricultural land in Sub-Saharan Africa | 22 kg N/ha 2.5 kg P/ha 15 Kg K/ha |