Field experiments with common bean crops grown under no-till farming were conducted at three sites with the following soil texture classes: sandy loam (coarse-textured soil), sandy clay loam (medium-textured soil), and clay (fine-textured soil) (Table 1), which were classified as Typic Hapludox, Rhodic
Hapludox, and Typic Rhodudalf (Soil Survey Staff 2014) respectively.
The main soil orders in the region are Humic and Typic Dystrudepts, Lithic Udorthents and Rhodic
Kanhapludults (Flores et al., 2012).
Oat cultivars were grown in Rhodic
Hapludox (USDA, 2014).The soil was collected in the 0-20 cm top-layer in a field cultivated with grain crops and managed with no tillage.
The major soils in Yatta sub-county are a combination of Ferric Luvisols, Lithisols and Rhodic
Ferralsols (USDA, 1978; WRB, 2006).
Soil quality indicators in a Rhodic
Paleudult under long term tillage systems.
There are four different types of soil in the region: clay loam dystrophic acrisols (chromic), rocky/coarse dystrophic acrisols (chromic), rocky/coarse dystrophic and eutrophic acrisols (chromic), and clayey dystrophic rhodic
haplustox (Machado and Santos, 2003).
The soil was characterized as a typical Rhodic
Ferralsol (WRB, 2015).
Major soil types traversing the study area are Hyperdystric Cambisol (loamic and ochric), Rhodic
Acrisol (clayic, cutanic, epieutric, and profondic), Luvic Stagnic Umbrisol (endoeutric and loamic), Endogleyic Protovertic Eutric Cambisol (colluvic and ruptic), and Pellic Vertisol (ferric, humic, and mesotrophic) .
No tillage and crop rotation effects on soil aggregation and organic carbon in a Rhodic
Ferralsol from southern Brazil.
Masinde, "Effects of rock phosphate, lime, and green manure on growth and yield of maize in a non-productive niche of a Rhodic
Ferraisol in farmer's field," in Advances in Integrated Soil Fertility Management in Sub-Saharan Africa: Challenges and Opportunities, A.
Ferralsols are the predominant soil type, in which Xanthic Ferralsols dominate the 1 000-1 800 m altitudinal zones, and Rhodic
Ferralsols are dominant below 1 000 m altitudinal zones (Tran 1991, Vo et al.