ASSESSMENT OF PHYSICAL AND CHEMICAL PARAMETERS OF MODAL SOIL IN RELATION TO POND CONSTRUCTION AND PRODUCTIVITY IN NIGERIA
A study was carried out for five weeks to examine physical and chemical parameters of modal soil in selected areas in relation to pond setting and productivity in Lagos State, Nigeria. Physical (water temperature, soil permeability, bulk density and textural) and chemical parameters (pH, nitrogen and phosphorus) were determined according to standard. Results showed that the soil of the study area belongs to four different textural classes: sandy, sandy clay, clay loam and sandy clay loam. The sandy clay was dominant with 38 % proportion, sandy (28 %), sandy loam (28 %) and sandy clay loam was least with 6 % proportion of the prevalent soil textural class in the study area. Soil permeability (6.2 – 24.9 mm/hr) exceeded the permissible value 4mm/hr, Soil bulk density and pH (1.20 – 1.57g/cm3) and (5.3 – 7.3) were within acceptable limits of 1,4g/cm3 and 7.5 respectively. Nitrogen (20.20 – 29.30 ppm) and phosphorus (1.93 – 6.57 ppm) contents for different soil locations were less than the recommended values of 50.0 and 9.0ppm respectively. These results revealed that the soil locations were not suitable for pond construction and productivity. Pond to be built in these areas requires special techniques such as building of clay core, puddle and compaction and application of lime and
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