1. Use of organic fertilizers to enhance soil fertility, plant growth and yield in a tropical environment;Ahmad,2016
2. Adoption, profitability, impacts and scaling-up of agroforestry technologies in southern African countries;Ajayi,2008
3. Tropical Soil Biology and Fertility: A Handbook of Methods;Anderson,1993
4. The Soils of Iceland;Arnalds,2015
5. Carbon sequestration and reclamation of severely degraded soils in Iceland;Arnalds;Buvisindi,2000