Abstract
This study examined cassava yield response to variable climate in the humid forest agro-ecological zone of Nigeria. The data employed for this study was sourced from the archives of Nigeria Meteorological Agency, Lagos State and Ogun State Agricultural Development Program, Abeokuta. Bivariate correlation, multiple regression and Z-distribution were employed for data analysis. Results show that monthly, seasonal and annual rainfall did not affect the yield of cassava but monthly, seasonal and annual minimum and maximum temperature was significantly related to cassava yield at p ≤ 0.05. Non-climatic factors have a greater influence on cassava yield than climatic factors in the study area. Nevertheless, climatic factors influenced cassava yield more at Abeokuta than Ijebu-Ode. Cassava yield was lower from 1987-1993 (with negative significant impact in 1987 and 1988 at p ≤ 0.01) than 1994-2012. These results demonstrated that climate variability needs to be taken into account in cassava impact assessment.Keywords: cassava yield, impact, climate variability, rainfall, temperature
Highlights
MATERIALS AND METHODSThe Study Area: The study area, Ogun State is situated between latitudes 6.2 oN and 7.8 oN and longitude 3.0 oE and 5.0 oE
Nigeria, cassava production ranks first, followed by yam production at 27 million tones in 2002, sorghum at 7 million tones, millet at 6 million tones and rice at 5 million tones (FAO, 2004)
Seasonal and annual rainfall had no significant relationship with cassava yield in the study area (Tables 1, 2 and 3)
Summary
The Study Area: The study area, Ogun State is situated between latitudes 6.2 oN and 7.8 oN and longitude 3.0 oE and 5.0 oE Ogun state is located in the moderately hot, humid, tropical climatic zone of southwestern Nigeria. It enjoys a tropical climate governed by the Intertropical Discontinuity (ITD). The climate variables used in the bivariate correlation analysis included mean annual, seasonal totals and monthly rainfall and temperature (maximum and minimum) during the growing season for the stations of Abeokuta and IjebuOde. The growing season is the period of the rainfall duration from rainfall onset to cessation. The dependent variable was the yield of cassava while the independent variables were mean annual rainfall and temperature (maximum and minimum).
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