Physiological Response of Lavandula to the Use of Raw and Treated Effluent in Surface and Subsurface Irrigation With Permeable Tubes

One of the major issues facing arid and semi-arid regions is the water crisis, which has been exacerbated by recent droughts. Limited water resources in these areas require the use of unconventional waters such as wastewater to irrigate urban landscape plants and the agricultural sector. This study was conducted to investigate the effect of raw and treated wastewater on some characteristics of landscape plants Lavandula in irrigation by using permeable tubes. The experiment was performed as a factorial experiment in a randomized complete block design with three replications in the research site of Yazd Taft Wastewater Treatment Plant. Experimental treatments included type of irrigation water (well water, raw wastewater and treated wastewater) and irrigation method (subsurface using permeable tubes and surface irrigation). The results showed that the effect of interaction between irrigation water type and irrigation method on SPAD reading at 5% level and on ion leakage was significant at 1% level in Lavandula. Based on the results, SPAD reading and water use efficeincy in lavender were obtained by using raw wastewater by subsurface irrigation method. According to the results of this study, the municipal wastewater can be used in a subsurface method to irrigate landscape plants.