Agricultural produce remains Kenya’s largest export and in many parts of the country, the loss of fertile top soil is a major problem.

Population growth, erosion and poor methods constantly threaten the viability of the soil and its ability to grow crops.

But now, a Kenyan company is offering loans to farmers where the interest rates charged are linked to the quality of the soil, providing an incentive for soil preservation.

The BBC’s Hannah McNeish reports from the Aberdares in central Kenya for Africa Business Report.