Sokoine University of Agriculture

Pedological characterization of some typical alluvial soils of Kilombero District, Tanzania

Show simple item record Kalala, A. M. Msanya, B. M. Amuri, N. A. Semoka, J. M. 2017-04-13T06:36:08Z 2017-04-13T06:36:08Z 2017-03-02
dc.identifier.issn 2330-8583
dc.description American Journal of Agriculture and Forestry 2017; 5 (1): 1-11 en_US
dc.description.abstract This study was carried out in Kilombero District, Tanzania with the objective of characterizing the soils in terms of their morphology, genesis, physico-chemical properties and classification. Three pedons KISA-P1, MKU-P1 and MBA-P1 were identified within the Kilombero Valley, dug, described and sampled. Disturbed and undisturbed soil samples were taken from designated pedogenic horizons for physical and chemical analysis in the laboratory. Using both field and laboratory data soils were classified using both USDA Soil Taxonomy and World Reference Base for Soil Resources schemes of classification. Results show that the three pedons were developed under Isohyperthemic temperature and Aquic moisture regimes. All pedons were deep (100 - 120 cm). Whereas Pedons KISA-P1 and MBA-P1 had sandy clay loam topsoils overlying sandy clay subsoils, Pedon MKU-P1 had clayey texture throughout its profile depth. All pedons had low chromas of . 3 and redoximorphic features in form of abundant mottles particularly in the subsoils. Topsoils of Pedons KISA-P1 and MBA-P1 had dominantly friable to very friable moist consistence while those of Pedon MKU-P1 had very firm moist consistence. Subsoil moist consistence varied from firm to extremely firm (Pedons KISA-P1 and MKU-P1) and from friable to very firm (Pedon MBA-P1). Structures were dominantly weak to moderate subangular blocky in all studied soils but some horizons were structureless single grained and massive. Soil reaction ranged from extremely acid (topsoil of MBA-P1) to mildly alkaline (subsoil of MKU-P1) with pH values of 4.44 and 6.73 respectively. Topsoil organic carbon and total nitrogen contents in the studied pedons were low (0.66 to 1.4%) and very low to low (0.08 to 0.19%) respectively. CECsoil values were rated as low to medium ranging from 8.4 to 23.8 cmol (+)/kg respectively in Pedon KISA-P1 and Pedon MKU-P1. Percent BS values varied between and within studied pedons and ranged from low < 50% to high > 50%. Studied soils manifested nutrient imbalances in respect of basic cations. On the overall, fertility of the studied soils was rated as low to medium. According to USDA Keys to Soil Taxonomy, Pedons KISA-P1 and MKU-P1 classified as Inceptisols, equivalent to Cambisols in WRB for Soil Resources whereas Pedon MBA-P1 classified as Entisols equivalent to Fluvisols. All three sites were recommended for paddy production. en_US
dc.language.iso en en_US
dc.publisher American Journal of Agriculture and Forestry en_US
dc.relation.ispartofseries American Journal of Agriculture and Forestry;2017; 5(1): 1-11
dc.subject Physico-Chemical Properties en_US
dc.subject USDA Soil Taxonomy en_US
dc.subject WRB en_US
dc.subject Pedons en_US
dc.subject Kilombero District en_US
dc.subject Tanzania en_US
dc.title Pedological characterization of some typical alluvial soils of Kilombero District, Tanzania en_US
dc.type Article en_US
dc.url en_US

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