بررسي اثرات كاربرد پساب فاضلاب تصفيه شده شهري در روش هاي مختلف آبياري سيب زميني

Effects of using municipal wastewater in irrigation of potato

Whenever good quality water is scarce, water of marginal quality, such as treated municipal wastewater, will be considered for using in agriculture. In this study, secondary treated municipal wastewater effluent of Isfahan Wastewater Treatment Plant is used to irrigate two varieties of potato (Morfona and Navita) in 2000-2001 cropping season. Five irrigation treatments including: furrow irrigation with well water (T I), drip irrigation with treated wastewater (T2), subsurface drip irrigation (at a depth of 15 cm) with treated wastewater (T3), subsurface drip irrigation (at a depth of 30 cm) with treated wastewater (T4) and furrow irrigation with treated wastewater (T5) were considered. Crop water requirement was determined by ET-HS model and some contamination indices were measured in irrigation water and potato tubers. The results showed that surface and subsurface drip irrigation has decreased soil pollution as compared to furrow irrigation. T3 had highest yield (46 tons per hectare for Marfona and 22.56 tons per hectare for Navita). Part of this increase in the yield over other treatments was attributed to better soil moisture and more available nitrogen. T3 had the highest water use efficiency, too. T1 and T4 treatments had the least microbiologic contamination.