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<p>Two pot experiments were carried out to investigate effect of deficit irrigation with wastewater on seed yield, heavy metals and seedling emergence in oat (<em>Avena sativa</em>). The research at seedling stage included different ratios of sewage-contaminated water (100% well water, 75% well water + 25% wastewater, 50% well water + 50% wastewater, 25% well water + 75% wastewater and 100% wastewater) and three irrigation intervals (1, 2 and 3 days). The research at complete plant stage included different ratios of sewage-contaminated water used at seedling stage and irrigation intervals of 2, 3 and 4 days. Results showed that at oat seedling stage, irrigation interval of 1 days and 100% wastewater produced the highest seedling weight. Irrigation interval of 3 days with 100% wastewater had the lowest seedling emergence. At complete plant stage, by increasing wastewater concentration, leaf chlorophyll content was increased, but relative water content was decreased. 100% wastewater produced the highest seed yield, 1000-seed weight, concentrations of zinc, copper and potassium. According to references, the concentration of studied heavy metals was lower than dangerous threshold. </p>
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