The impact of sewage irrigation on morphological characteristics, yield components, and contain elements of seed cotton (cultivar varamin) in Shahr Ray region

To investigate the effects of city sewage on yield and yield components and the contamination balance of heavy metals in Ray Zone, an experiment in form of randomized complete block design with four replications and 5 treatments: Includes Treated domestic wastewater (T1), untreated domestic wastewater raw sewage, (T2) irrigation with well water and treated wastewater as interlaced (T3), irrigation with well water and untreated wastewater as interlaced (T4) and Well water as a control (T5) was conducted. The study showed that the effect of treatments on yield and its components was significant and best yield performance was achieved from untreated city wastewater. A significant difference at 1% level of earliness was observed among the treatments that the highest percentage of earliness with 75/8% belonged to Control which well water was used and untreated city wastewater had the least percentage of earliness. Significant differences at 1% level of the amount of manganese, copper, iron, nickel, cadmium and lead in cotton seed was observed among treatments. This study showed that the effect of treatments on yield and yield components were effective and the best performance was obtained using untreated home wastewater. The reason is that in this type of wastewater have more nutrients that play an important role in the production of bolls numbers and the performance of final yield. In arid and semi-arid regions like Iran reuse of water can be a means to compensate for water shortages.