Management of poor quality irrigation water
2000
Chang, M.H. | Leghari, A.M. (Drainage Research Centre, Tandojam (Pakistan)) | Sipio, Q.A.
The effect of poor quality drainage effluent on moderately saline- sodic, medium textured soil at different growth stages of wheat and cotton is reported. The irrigation treatments were: i) All canal irrigations, ii) one irrigation of 75 mm with saline drainage effluent (EC= 3 dS m-1) after four weeks sowing of the crop, iii) one irrigation of 75 mm with saline drainage effluent after seven weeks sowing of the crop, and iv) one irrigation of 75 mm with saline drainage effluent after ten weeks sowing of the crop. The treatments receiving saline water gave significant decrease in crop yields as compared to canal irrigation treatment. The higher yield of wheat and seed cotton was recorded in T1 followed by T2, T3 and T4. The trend of produce was T1 less than T2 less than T3 less than T4 respectively. Electrical conductivity of the soil (ECe) in T1 was decreased and in other three treatments was increased, whereas, pH decreased in T1 & T2. The SAR of soil decreased in all the treatments as compared with initial values. Treatment receiving an irrigation with saline water after four weeks of sowing (T2) was better in reducing soil salinity as compared to treatments receiving such water after 7 or 10 weeks of sowing. Poor quality water (EC=3 dSm-1) can be managed for irrigation after four weeks of sowing of crops provided certain soil and water management practices like good seed bed preparation and proper drainage measures are adopted.
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