摘要：Land degradation cripples smallholder crop production in Sub-Saharan Africa, including those found in the densely populated, grain basket areas of Kenya. Research in the early nineties already documented and rated nutrient depletion to be very high in the east African Highlands. Whereas some of the soil related problems are inherent, smallholder farmer practices have contributed to the degradation, including the increasing soil nutrient depletion.
