Sokoine University of Agriculture

Pedological characterization, clay Mineralogy and classification of, some Soil of Mikese Area, Morogoro District, Tanzama

Show simple item record Msanya, B. M. Kimaro, D.N. Kimbe, G.G. 2017-12-18T06:13:19Z 2017-12-18T06:13:19Z 1999
dc.identifier.issn 0856 668X
dc.description Tanzania Journal of Agricultural Sciences1999, Vol. 2(1); 7-18 en_US
dc.description.abstract A study was carried out in Mikese Ward, Morogoro District, with the objective to make an inventory·of the soils of the area, to determine their physico-chemical and mineralogical properties and to classify them. Eight soil profiles were identified and form three major groups of soils ·namely, very deep, well drained, dark reddish brown to dark brown, sandy clay loams and sandy clays on the steep convex slopes; very deep, well drained, dark brown to dark red, sandy clay loams and; sandy clays on the linear slopes; and very deep, well and imperfectly drained sa1'1dy loams to sandy clay loams a~q sandy clays in the valley bottoms. The soils of the convex and linear slC?pes classified as Isohyperthermic, deep, mixed, Kanhaplic Haplustalfs and Isohyperthermic, deep, mixed Oxic Ustropepts representin~ a relatively advanced pedogenic development as indicated by high contents of Fe, Al and,Ti and relatively low SiiAI ratios. The soils of the valley bottoms classified as Isohyperthennic, deep, mixed, 'Typic Argiustolls, Isohyperthermic, deep, mixed, Typic Tropaquepts and Isohyperthermic, deep; mixed, Fluventic Ustropepts. These soils are of low to intermediate pedogenic development as indicated by the relatively lower Fe, Al and Ti contents and both high Stand SilAI ratios. X-ray diffraction analysis revealed that the studied soils have a mixed clay mineralogy including kaolinite and mica. Small amounts of smeciite were identified in one profile with alkaline subsoil reaction. Bulk densities of surface horizons are rela~ tively lower than those of subsoils rangingfrom 1.1 to I. 6 Mglm3 in topsoils andfrom i.4 to i.-9Mglm1 in subsoils. Total porosity rangedfrom 40 to 58% in surface soiis and frbm'28 to,32 % in ~ubsoils. Available water holding capacities of the soils are between 155 and 248 mmlm of soil. The soils IWve overall poor supply of Nand P. The basic catio,!s Ca++, Mg+ + and, K+' are medium to high throughout the profiles. The CEC of the soils is very low with values rangingfroin 6 to 13 cmol(+ J/kg soil). These results imply that continuous utilization of the soils for c;rop production withoutproper management will result into a drastic loss of soil fertility. en_US
dc.language.iso en en_US
dc.subject Pedological characterization en_US
dc.subject Mineralogy en_US
dc.subject Soil classfication en_US
dc.title Pedological characterization, clay Mineralogy and classification of, some Soil of Mikese Area, Morogoro District, Tanzama en_US
dc.type Article en_US

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