Abstract:
A review of soil acidity problems with regards to causes, extent and management in Ghana
shows that the extent of soil acidity has changed within a period of 2-3 decades. In the
1970s’ soil acidity was a major problem in the Western region and the lowlands. Oxisols and
Ultisols are common soils found in this area. However, anthropogenic causes have augmented
natural causes resulting in more low pH soils. Soil acidity has therefore become a
serious problem throughout the country. Anthropogenic causes identified include general
agronomic practices such as tillage, use of mineral fertilizers and continuous cultivation.
Rates of 1-2 t ha-’ lime on ultisols and oxisols in Ghana are more than adequate to meet
the calcium demands and sufacient to neutralize residual acidity of any nitrogen fertilizer.
Addition of organic amendments on low pH soils was also found to be beneficial and
resulted in increased yields. The adoption of the “sawah” technology for lowland rice production
has also resulted in improved water management, increased nutrient availability
and significant increases in rice yields.
