Title: The development of a prototype land information system for the northern
Authors: Tabi, FO
Ogunkunle, AO
Diels, Jan
Issue Date: 2007
Publisher: Springer
Host Document: Advances in integrated soil fertility management in sub-Saharan Africa: challenges and opportunities pages:629-646
Abstract: Data and maps from soil surveys conducted in the past can assist to better target agricultural technologies and to
make technical recommendations more site-specific. Although data on soil and land characteristics are available
for the northern Guinea savanna (NGS) agro-ecological zone of Nigeria, they are not in a form that can be easily
retrieved, combined with other information, and used for decision-making in crop production and in planning
agro-technology transfer. Now that appropriate tools are available for creating databases and for more quantitative
analyses and interpretation of data, the potential of a given technology can be assessed over a large geographical
support. This study was designed to evaluate major soils in a 20,000 km2 test area in the NGS of Nigeria in terms of
yield returns with the use of mineral fertilizers, farmyard manure (FYM) and their combination.A second objective
was to develop a land information system to support the transfer of combined use of mineral fertilizers and farmyard
manure within the entire NGS.
The performance of the Quantitative Evaluation of the Fertility of Tropical Soils (QUEFTS) model to estimate
potential nitrogen and phosphorus supply capacities of soils as well as maize grain yield estimates was tested, and
next used to estimate yields for available soil profiles within the test area. Other empirical models were used for
the quantification of the land qualities moisture supply capacity, susceptibility to crusting, and susceptibility to
water erosion that related to maize production in the agro-ecological zone. An attribute database of soil properties,
land characteristics, land qualities and predicted maize grain yield was established and linked to a spatial database
(land system map). The 20,000-km2 test area within the NGS agro-ecological zone was stratified into different land
management units (LMUs) based on the QUEFTS-based estimates of maize grain yield when no fertilizer or manure
is applied. Three land management units of significantly different (P < 0.05) yield potential were delineated in the
larger test area, with the first management unit LMU1 (687 kg ha−1) being the least productive and the third, LMU3
(1382 kg ha−1) the most productive.
Major soils in the NGS benchmark area are responsive to combined use of FYM and mineral fertilizers. Response
to this integrated nutrient management (INM) technology is expected in the larger target area, because of the similarity
in native soil fertility status and other crop production constraints (provided by the land information system
developed) of the larger NGS benchmark area with that of the two villages in which the INM technology was tested
on-farm. Response is expected to be highest in LMU1 (if measures to check erosion and to reduce surface crust are
taken into consideration) and least in LMU3
ISBN: 978-1-4020-5759-5
Publication status: published
KU Leuven publication type: IHb
Appears in Collections:Division Soil and Water Management

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