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NIGERIAN JOURNAL OF SOIL AND ENVIRONMENTAL RESEARCH

Year: 2018|   Volume No: 17|   ISSN: 1595-61-21|   Page No: 83 - 91


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Title:  Soil Suitability Evaluation and Management for Cassava (Manihotspp.) Cultivation in Selected Soils of Obio-Ndot, Oruk Anam L.G.A., South Southern Nigeria
Nsor, M.E. and Udofia, P.A.

DEPARTMENT OF SOIL SCIENCE AND METEOROLOGY, MICHAEL OKPARA UNIVERSITY OFAGRICULTURE, UMUDIKE,ABIA STATE, NIGERIA.

ABSTRACT

Soil suitability evaluation for cassava (Manihotspp.) cultivation in Obio-Ndot farm land was carried out based on the morphological, physical and chemical characterization of the soils. A preliminary reconnaissance survey delineated the study area into three (3) mapping units based on toposequence namely, steep slopes, gentle slopes and flood plains. Six (6) profile pits, two (2) per mapping unit were dug, described and examined to represent the study area. Soil samples were collected from genetic horizons, processed and analyzed for physical and chemical characterization. The results indicated a moist surface colour of dark brown (10YR 3/4) to brownish black (7.5YR 2/2) over bright brown (7.5YR 5/6) and yellowish brown (10YR 5/6) sub soils for soils of steep and gentle slope mapping units. The flood plain mapping units had brownish grey (7.5YR 5/1) top soils over grayish (7.5YR 5/2) sub soils that had bright brown (2.5YR 5/6) to brownish (7.5YR 4/4) redoximorphic features (mottling). Physically, sand particles were more dominant in the surface soils of gentle and steep slope units (60-86%). The flood plain unit had an almost equal proportion of sand (20-44%), silt (19-57%) and clay (19-53%). Chemically, the soils of steep and gentle slopes units were strongly acid (pH 4.7-5.2), low to moderate in basic cations and CEC. The soils of flood plain units were moderately acid (pH 5.2-5.8), medium to high in basic cations and CEC. The soils of steep and gentle slope mapping units were classified Psammentic Paleudults (USDA) and AlbicArenosols (FAO/UNESCO). The flood plain soils mapping units were classified TypicHumaquepts (USDA) and EutricCambisols. The actual productivity index ratings evaluated the soil of steep slope mapping unit as currently not suitable NI (13.7%), whereas the soils of gentle slope (23.5%) and flood plain (22.0%) units were evaluated marginally suitable (S3) for cassava cultivation in the study area. Management measures including the use of liming, manuring, fertilization, erosion control etc for soils of steep and gentle slope mapping units and in addition proper drainage for soils of flood plain units would enhance the suitability of these soils for cassava production in the study area.

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