Abstract
The perpetual decline of the quality of available surface water resources due to increasing global pollution menace necessitates the needfulness for suitability assessment of river water resources for irrigation purposes. Water samples were collected during the dry season (November, 2018) and wet season (July, 2019) into sterilized, labelled bottles and were transported in ice packed to laboratory for analyses. Results showed the pH 6.87-6.91, calcium 36-38 mg/l, magnesium 8-9 mg/l, potassium 2.40–2.50 mg/l, sodium 1.28-1.46 mg/l, bicarbonate constant at 180 mg/l, phosphate 0.08-0.11 mg/l, electrical conductivity constant at 0.06mg/l, Nitrate 0.04–0.41 mg/l, sulphate 26-28 mg/l, total dissolved 33.30-34.10 mg/l, chloride 7.5-9 mg/l for the dry season and the pH range of 7.15-7.33, calcium 30-32 mg/l, magnesium 17-18 mg/l, potassium 2.70–2.80 mg/l, sodium 1.86-1.88 mg/l, bicarbonate 290-295 mg/l, phosphate 0.11-0.12 mg/l, electrical conductivity 0.13-0.14 mg/l, Nitrate constant at 0.07mg/l, sulphate 35-36 mg/l, total dissolved solid 64.30-67.50 mg/l, chloride 12-14 mg/l for the rainy season. Most of the samples analyzed were within the recommended limits set by [22], [13] for irrigation water standard. The water quality indicators SAR,0.05; SSP,2.28; KR,0.02; PI,78.03; RSC1.37 for dry season and SAR, 0.07; SSP, 2.62; KR, 0.03; PI, 73.28; RSC, 1.79 for rainy season were under safe limits.
Highlights
Water is an important source of life which is extremely essential for survival of all living organisms
Descriptive statistics of water quality indicators The results of the minimum, maximum, mean, standard deviation and coefficient of variation of the water quality indicators evaluated for Oba River in Ogbomoso are presented in Table 1 and Table 2 for dry and rainy season respectively
The water samples results revealed that the area are under desirable limit and suitable for irrigationboth during the dry and rainy season as quality indices ranged from good to excellent uses
Summary
Water is an important source of life which is extremely essential for survival of all living organisms. Water is one of the abundantly available substances in the nature which men have exploiting more than any other resources for the sustenance of life. The visible bodies of water are referred to as surface water. These are essential water for achieving good agricultural produce and to attain standard food security in developing countries in the world. Remaining 0.6 per cent is in underground form [37]. The qualities of these water bodies vary widely depending on the location and environmental factors [4]
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