[Effect of treated wastewater on concentration of nutrients and some heavy metals in soil and irrigated corn plants]
1988
El-Khattari, S. | Jamjoum, Kh. (Jordan Univ., Amman (Jordan))
Results indicated that irrigation with treated wastewater increased the total dry matter yield of corn and its components, especially ear yield, where the increase was 18% over the control. Concentration of heavy metals Ni, Cd, Pb, in corn leaves and seeds was not affected by irrigation with treated wastewater as compared to that irrigated with regular water, whereas the concentration of N, P, K was increased. The concentrations in plant leaves were 2.35% N, 0.2% P, 2.2% K, wastewater irrigation, respectively, while irrigated with regular water they showed 1.93% N, 0.25% P, 1.69% K. In corn seeds of wastewater irrigated plants concentrations were 0.8, 0.28, 0.25%, respectively, and 0.71, 0.26, 0.22% in plants irrigated with regular water. Wastewater also affected the soil EC and organic matter content but had no significant effect on pH. At mid-season soil EC increased by 0.35mmhos/cm, and organic matter by 0.16% at the surface soil, while at the end of the growing season increase in EC reached 0.41mmhos/cm due to use of wastewater, but organic matter content did not increase significantly. Soil extractable P and K were highly increased while the extractable trace nutrients were increased to lesser extent. No increase in extractable heavy metals concentration was detected. The high quality treated wastewater, produced from the airport treatment plant, could be used in irrigation of economic crops with continuous monitoring for water quality to avoid the addition of undesired substances
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