Investigation of the Effect of Irrigation Water Quality, Treated Wastewater and N. P. K Fertilizer Management in Broccoli Cultivation on Soil Chemical Properties

The aim of the present research is to study the effect of both different irrigation water quality (treated wastewater and urban water) and N. P. K fertilizer via Tape subsurface micro irrigation on the soil chemical properties in the test area was investigated in Fras Bajgah Region in 2010. In this study، the impact of treated Shiraz urban wastewater under micro irrigation in broccoli cultivation on the soil chemical properties was evaluated. According to the results of this research، Electrical Conductivity to a depth of 30 cm of soil was increased significantly due to irrigation with wastewater and irrigation fertilizer comparing to urban water. Also، using wastewater increased pH in surface layer of soil. Although، considering the buffer wastewater and soil environment and its resistance to ph variations، there was little increase. Moreover، the treatment containing the wastewater was led to increase Sodium Absorption Ratio (SAR) in the surface layer of soil. However، this effect was more in treatments which that have benefited the fertilizer and wastewater. Also، variations of Bicarbonate، Sulfate and accumulation B، sodium;Na، ferro;Fe، zinc;Zn، copper;Cu، potassium;K and magnesium;Mg، to a depth of 30 cm of soil and also the accumulation of nitrogen، calcium، phosphorus in the depth of soil in an area under studying was increased significantly due to irrigation with wastewater and irrigation fertilizer comparing to urban water. As expected، using the wastewater increases the concentration of heavy metals of nickel، lead and cadmium in under studying soil area.