An investigation of the environmental effects due to Chemical Fertilizers usage on the chemical characteristics of drainage water of DEZ pilot irrigation
2011
Paknejad, Alireza | Salimpour, Saeed
Nearly 50 percent of Dez river water after irrigation of agricultural fields with a large amount of fertilizers and element contaminants through the drains come back to the river. Drainage water for agricultural fields has been used from long ago. For knowing contaminant status in drains this experiment was conducted for tow years water samples were taken from river and eight main drains monthly and PH, EC, and amount of SAR, NO3/N, PO4 and heavy elements of Fe, Ni and Cd were measured. Compared to the beginning of the river, the highest quality variation were observed in Lure Shure and Atij drains and the lowest variation was observed in Salimeh and Sekheiri drains. The highest variation of EC on average 3.2 times of the beginning of the river at 1400 micromhos/cm was recorded. According to Wilcox classification river water was C2 S1 and the worst drain was C3 S1, so from the salinity and Sodium danger stand point using of all of the drains for agricultural use has no problem. Variation range for the amount of Nitrate was 2-75 mg/L and Phosphate was 0.1-2.2 mg/L, which is indicative of the positive effect of these factors fertilizer source. The amount of heavy elements of drains were lower than the standard level and the amount of Cadmium at the end of the network was lower than the detection level of the device (0.01mg/L). The amount of Fe at the beginning of the network with 0.04mg/L and at the end of the network with 0.05mg/L was not significantly different and the high out put of river could be the main cause of this similarity. The lowest variation was observed in PH which is because of the amount of Bicarbonate in the river.
Показать больше [+] Меньше [-]