Authors: 1Nuhudeen, Z. O., 1Adamu, A. and 2Ibrahim, F.B.
The quality of water used for irrigation is a very important aspect of irrigated agriculture as the use of poor quality irrigation water affects the crop and the physical conditions of the soil. This work assessed the irrigation water quality of Kano River Irrigation Project (Kadawa sector). Water samples for the pre and post irrigation water were collected and tested for electrical conductivity, pH, Total Dissolved Solids (TDS), Calcium (Ca++), Magnesium (Mg++), Sodium (Na+), Carbonate (CO3-), and Bicarbonate (HCO3-), Chloride (Cl-), Nitrate-Nitrogen (NO3-N), Ammonia-Nitrogen (NH3-N), Phosphate-Phosphorus (PO4-P), Potassium (K+) and Boron (B). The result of the analysis showed that the salinity of the water was very low as the electrical conductivity ranged from 0.063 - 0.065ds/m. The sodium adsorption ratio of the water was also very low as it was calculated to range between 0.27 and 0.29. However, infiltration problems might still arise even with the low sodium adsorption ratio due to low calcium/magnesium ratio of the water (far less than 1). The sodium, chlorides and boron concentrations of the water ranged between 0.23 and 0.26, 0.32 and 0.35, 0.82 and 0.91 respectively. However, the results obtained revealed that the pre - irrigation water quality was within the limit for irrigation water standard. On the other hand, the range for the post irrigation water quality samples collected were as follows: pH (6.98 - 7.30), TDS (328 - 446 mg/l), SS (312 - 334 mg/l), Cl (11.3 - 12.1 mg/l), SO4 (1.2 - 1.4 mg/l), NO3 (15.92 - 17.64 mg/l), PO4(6.76 - 7.8 mg/l) DO (1.86 - 2.18 mg/l), BOD (38 - 44 mg/l) and COD (40.4 - 43.2 mg/l). These results showed shows that the post irrigation water had high suspended solids and nutrients concentration. This indicates that its disposal into water bodies through surface runoff may have detrimental effects.
Keywords: irrigation, water quality, salinity, crop yield, SAR.
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