Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Kenya → Evaluation of land cover and crop type change : building evidence on the effect of cropping systems and organic inputs on sorghum yield and enhancing farmers climate change adaptive capacity

University of Nairobi (2014)

Evaluation of land cover and crop type change : building evidence on the effect of cropping systems and organic inputs on sorghum yield and enhancing farmers climate change adaptive capacity

Agesa, Beverly L

Titre : Evaluation of land cover and crop type change : building evidence on the effect of cropping systems and organic inputs on sorghum yield and enhancing farmers climate change adaptive capacity

Auteur : Agesa, Beverly L

Université de soutenance : University of Nairobi

Grade : Master of Science Degree in Sustainable Soil Resource management (SSRM) 2014

Résumé partiel
The Arid and Semi Arid Lands (ASALs), which in Kenya constitutes 80% of its landmass, are the most affected by climate change. Crop production is most affected as a result of climate variability with farmers being the most affected in terms of reduced crop yields, poverty and food insecurity. A study was carried out in Yatta sub – County, Kenya to assess farmers‟ perceptions, coping and adaptation strategies, crop type change within the past two decades in relation to climate change. Additionally, climate change effects on the growth and yield of sorghum under different cropping systems and organic inputs was modelled. A semi structured questionnaire administered to 60 farmers in the two study divisions of Yatta sub - County (Katangi and Ikombe) was used to collect the said information and ground truthing to estafblish the crop type change. Geographical Information Systems using Landsat imageries from the years 1986, 2000 and 2012 were used to assess the change in crop type over the past two decades. Field experiments were carried out in two seasons (short rains from October – December 2010 ; long rains from May – July 2011 ;) to determine the effects of cropping systems (monocropping, intercropping and rotation) and organic inputs (farm yard manure and compost) on sorghum performance. A randomized complete block design (RCBD) with a split plot design replicated three times was used. The main plots were the cropping systems while the subplots comprised of the organic inputs. The Agricultural Production Systems sIMulator (APSIM) was employed to model the effects of climate change on the growth and yield of sorghum under the different cropping systems and organic inputs. Correlation coefficient, root mean square error (RSME), normalized root mean square (NMRSE) and range ratio (RR) were used to test the model efficiency. Climate change scenarios were used to simulate future climatic effects on sorghum production under different cropping systems and organic inputs. The farmers in the region were aware of climate change and the major aspects of climate change mentioned were erratic rainfall (62%), low rainfall (43%), prolonged droughts (39%), increased temperatures (35%) and flooding (10%). The major causes of climate change were deforestation (63%), industrial pollution/chemicals (22%) and human activities (8%). Farmers in both divisions observed that reduced crop yield (52%) and crop failure (41%) were significant effects felt as a result of climate change. Introduction of drought tolerant crops (45%), reduced yields (43%) and change in planting time (38%) were the three main impacts of climate change on crop production in Yatta sub – County. The farmers identified early land preparation/planting on time (52%), use of organic and inorganic fertilizers (37%), planting early maturing crop varieties (28%) and water - soil conservation (18%) as the top adaptation strategies to climate change

Présentation

Version intégrale (2,66 Mb)

Page publiée le 11 décembre 2014, mise à jour le 21 février 2018