Table 2 shows the physico-chemical composition of some groundwater in the study area. The waters are
moderately acidic, with pH values ranging from 5.59 to 6.30. Therefore the water is likely to be corrosive
when used for a long time, suggesting the need for the use of PVC, plastic or well coated steel pipes for the
water supply if lime is not added. A pH ranging between 5 and 6.5 has been reported for some groundwater
in Southwestern Nigeria (Asseez, 1972). The values of electrical conductivity range from 156.26 to
275.70mmhos/cm. The borehole at Ososun gave the highest value both for pH (6.30) and EC (257.70).
According to Richard, 1954 all the groundwater falls in the C1S1 (low salinity, low alkalinity). The total
dissolved solids of the groundwater ranges from 150 to 247.4ppm. These values suggest that sprinkler system
could be used without much damage to the nozzles. The chloride concentration in all the samplers ranged
from 1-20mg/l with a mean of 9.67mg/l. The sodium adsorption ratio (SAR) ranged from 0.68 to 3.44, which
indicate a low alkalinity hazard. The sodium concentration ranged from 16.6 to 57.2 mg/l while the
magnesium ion ranged from 1.09 to 3.2 mg/l. The values are within the acceptable range of values in
irrigation water according to the FAO, 1985 standards. There is no immediate toxicity effects envisaged from
the concentration in the different ions in the irrigation water.
Table 2 shows the physico-chemical composition of some groundwater in the study area. The waters are
moderately acidic, with pH values ranging from 5.59 to 6.30. Therefore the water is likely to be corrosive
when used for a long time, suggesting the need for the use of PVC, plastic or well coated steel pipes for the
water supply if lime is not added. A pH ranging between 5 and 6.5 has been reported for some groundwater
in Southwestern Nigeria (Asseez, 1972). The values of electrical conductivity range from 156.26 to
275.70mmhos/cm. The borehole at Ososun gave the highest value both for pH (6.30) and EC (257.70).
According to Richard, 1954 all the groundwater falls in the C1S1 (low salinity, low alkalinity). The total
dissolved solids of the groundwater ranges from 150 to 247.4ppm. These values suggest that sprinkler system
could be used without much damage to the nozzles. The chloride concentration in all the samplers ranged
from 1-20mg/l with a mean of 9.67mg/l. The sodium adsorption ratio (SAR) ranged from 0.68 to 3.44, which
indicate a low alkalinity hazard. The sodium concentration ranged from 16.6 to 57.2 mg/l while the
magnesium ion ranged from 1.09 to 3.2 mg/l. The values are within the acceptable range of values in
irrigation water according to the FAO, 1985 standards. There is no immediate toxicity effects envisaged from
the concentration in the different ions in the irrigation water.
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