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Kenyatta University (2019)

Effects of Climate Variability on Maize Yield in Nakuru County, Kenya

Koimbori, Jackson Kinyanjui

Titre : Effects of Climate Variability on Maize Yield in Nakuru County, Kenya

Auteur : Koimbori, Jackson Kinyanjui

Université de soutenance  : Kenyatta University

Grade : Master of Science (Climatology) 2019

Résumé partiel
The current climate in East Africa is characterised by large variability in rainfall and temperature with occurrence of extreme events such as prolonged and severe droughts that have led to increased cases of crop failure, hunger and destruction of habitats. This study analyzed the effects of climate variability on maize yield among farm holders in Bahati Sub- County, Kenya for the period 1985 to 2015. The specific objectives of this study were : to establish climate variability trends in rainfall and temperature experienced by farm holders in Bahati Sub-County, to analyze the effects of climate variability on maize yield in Bahati Sub- County and to identify and evaluate the existing climate variability adaptation strategies practised by farmers in Bahati Sub-County, Kenya. The climate parameters used included rainfall onset, rainfall cessations, seasonal rain, annual rainfall, annual mean temperature, maximum and minimum temperature. A descriptive case study was used relying on both primary and secondary data. Stratified random sampling technique was used to select 394 households from Dundori, Kabatini, Kiamaina and Bahati wards based on Yamane (1967) formula. Primary data was collected through household surveys and secondary data on rainfall and temperature for the past 30 years (1985 to 2015) was purposively sampled and collected from Nakuru Meteorological Station. Maize yield data for Bahati Sub-County was collected from the MOA, Tegemeo Institute and Nakuru County Agricultural Office for the period 1985 to 2015. The data collected on rainfall, temperature and maize yields was analyzed using Microsoft Office Excel 2010 and SPSS software version 23 to generate frequency tables, pie charts, graphs and moving averages. The findings were that annual rainfall and maize yield have shown a decreasing trend, while the average annual, maximum and minimum temperature have shown an increasing trend from 1985 to 2015. Rainfall has shown a decreasing trend during the long rain season and an increasing trend during short rain season. Rainfall variability is significant in both seasonal and annual trends with the highest annual rainfall variation below average occurred in 2000 with a variation of 350.40mm and highest annual variation above average occurred in 2010 with a variation of 475.80mm.


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