Research on soil fertility decline in tropical environments: integration of spatial scales.

Earth & Environmental Sciences

• tropical environment 100%
• soil fertility 83%
• farm 66%
• Central America 40%
• typology 27%
• Africa 26%
• soil nutrient 18%
• flow field 15%
• nutrient balance 12%
• nutrient 11%
• soil use 11%
• farming system 9%
• food production 9%
• database 8%
• land use 5%
• calculation 4%
• climate 4%
• parameter 2%

Agriculture & Biology

• soil fertility 72%
• farm typology 64%
• Sub-Saharan Africa 58%
• Central America 55%
• farms 52%
• soil nutrients 26%
• nutrient balance 16%
• nutrients 15%
• food production 12%
• land use 12%
• farming systems 10%
• climate 10%
• soil 6%