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Accueil du site → Master → Kenya → Modeling potential impact of climate change on Sorghum (Sorghum bicolor) and Cowpea (Vigna inguiculata) growth and performance under different tillage and cropping systems in semi-arid areas of Eastern Kenya

University of Nairobi (2012)

Modeling potential impact of climate change on Sorghum (Sorghum bicolor) and Cowpea (Vigna inguiculata) growth and performance under different tillage and cropping systems in semi-arid areas of Eastern Kenya

Kitinya, Kirina T.

Titre : Modeling potential impact of climate change on Sorghum (Sorghum bicolor) and Cowpea (Vigna inguiculata) growth and performance under different tillage and cropping systems in semi-arid areas of Eastern Kenya

Auteur : Kitinya, Kirina T.

Université de soutenance : University of Nairobi

Grade : Masters of Science in land and Water management 2012

Résumé
Crop models can be used to assess risk associated with climate change and variability. The output can be more useful to farmers if the process involves their input. This study was hinged on a participatory concept and therefore a survey in the study area (Makueni County, in Eastern, Kenya) was conducted to capture farmers experience, knowledge- and adaptation strategies employed in response to climate change and variability. A field trial was carried at Kambi ya Mae location in Eastern Kenya, to evaluate the effect of tillage and cropping system on performance of sorghum and cowpea. The trial was done during long rains (LRS) 2010 and short rains (SRS) 20 10/20 11 and consisted of three tillage (Tie-ridge, sub soiling and ox plough) and four cropping systems (sole sorghum and cowpea, sorghum-cowpea intercrop and rotation). The treatments were arranged in split plots with tillage practices as the main plots and cropping systems as the sub-plots in a Randomized Complete BIC !’CkDesign (RCBD).The APSIM model was used to assess the potential impact of limate change on sorghum and cowpea yields under semi-arid conditions with the following future climate scenarios considered, current temperature . (To) and rainfall (Ro) provided the baseline, To+2°C (T2), To+3°C (T3) and To+10% R reduction (R2) and a combined effect of T2 and T3 and R2 was examined for both crops. For Cowpea, CO2 fertilization at 450ppm and 700ppm and their combination with T2 and T3 and R2 was also examined. Rainfall unreliability and low amount was ranked top as the most important challenge farmers face and on average constituted 58% of the risks in their farming system.53% alleging that significant change in climate will manifest in 10 -20 years. CCV as an issue was rated very high by 72% of the farmers who solely depended on farming as their only source of livelihood compared to just 15% who had diversified ; income sources. This gave an insight into and confirmed farmer’s vulnerability.

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