Title: Fertiliser use and definition of farmer domains for impact-oriented
Authors: Manyong, VM ×
Makinde, KO
Sanginga, N
Vanlauwe, B
Diels, Jan #
Issue Date: 2001
Publisher: Kluwer
Series Title: Nutrient cycling in agroecosystems vol:59 pages:129-141
Abstract: One of the options to alleviate soil fertility constraints for sustainable agriculture in the savannas of West Africa is
to develop soil nutrient management technologies from an adequate supply and feasible share of organic and
mineral inputs. This paper makes a diagnosis of farm-level use of organic and inorganic inputs, as a basis for the
development of technologies. The results from the diagnosis are then used to develop a framework for
characterizing farmers for impact-oriented research on soil nutrient management systems. The survey was carried
out with 200 farmers carefully selected in two villages in the northern Guinea savanna of Nigeria. The results
showed that more than 90% of farmers in both villages used chemical fertilizers. This is contrary to a general
belief that they are not widely applied to food crops by smallholders in African agriculture. However, up to 81% of
the fields received less than half of the recommended 120 kgN/ha because of high costs due, probably to removal
of subsidies and inefficient marketing systems. Organic inputs such as animal manure were applied in very small
quantities (about 8% of the requirements). However there is evidence of integrated use of inorganic fertilizers and
organic manure on some (24%) of the fields. The problem to be addressed is that of the production (and efficient
utilisation) of organic inputs in the northern Guinea savanna. Nitrogen deficiency is the most limiting soil nutrient
in the cereal-dominated systems of study area. On this basis, farmers were classified into two a-priori groups using
a threshold of 30 kgN/ ha, and multiple quantitative variables were fitted in a discriminant analysis to validate the
typology. Results indicated that more than 75% of farmers were well classified into two groups that had the
characteristics of the a-priori groups. Two others were atypical and included the remaining 25% of farmers. Thus,
there are a total of four groups of farmers referred to as farmer domains in this paper. The two domains with 75%
of well-classified individuals are suitable for the selection of farmers with whom to conduct applied research or for
development activities because they represent the general patterns in the supply and use of soil nutrients in the
study area. Although basic research can be done in the four domains, the two atypical groups are most suited for
process-level studies to improve the understanding of factors that make the systems either more efficient or less
efficient than the two other farmer domains. In either case, representative farmers were easily identified by their
highest probability of belonging to a specific domain from the model results. Multivariate models constitute a
good framework to make a typology of, and to select farmers for, participatory research and extrapolation of
results in the northern Guinea savanna.
ISSN: 1385-1314
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Earth and Environmental Sciences
Division Soil and Water Management
× corresponding author
# (joint) last author

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