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University of Guelph (1991)

Management effects on organic matter in soils of the Uasin Gishu District of Kenya

Dogo, Yusuf Wako

Titre : Management effects on organic matter in soils of the Uasin Gishu District of Kenya

Auteur : Dogo, Yusuf Wako

Université de soutenance : University of Guelph

Grade : Master of Science (MS) 1991

Résumé
The effects of cultivation and cropping practices on Soil Organic Matter (SOM) were examined on nitosolic soils from cultivated sites adjacent to native pasture at a location in the Uasin Gishu District in western Kenya. The soil samples were collected from five different depths in the selected soil profiles to 100-cm depth. The management practices investigated were 25-yr pine plantation, 15-yr continuous cultivation (corn-wheat-oat rotation) and 5-yr cultivation (corn-wheat-oat rotation). The concentrations of c and n in the soil samples suggested that cultivation has reduced the total quantity of Som. At lower depths, management practices had no significant effect on organic matter levels. This may be due to : (1) lack of cultivation disturbance below 15-20 cm depth and thus cultivation effects limited to surface SOM ; (2) resilient physical characteristics of these soils to degradation. The concentration of organic c and n in the surface 30 cm soil samples from cultivated sites was significantly lower than that from the native pasture site. Cultivation affected the quality of Som more profoundly. The mineralizable pools, which account for 2-10% of the total Som, declined significantly as a result of cultivation.

Sujets : Farming ; Soils ; Uasin Gishu District ; Crop rotation ;

Présentation (BAC)

Page publiée le 26 janvier 2017, mise à jour le 14 septembre 2019