PJB-2007-283
EFFECTS OF UN-TREATED SEWAGE SLUDGE ON WHEAT YIELD, METAL UPTAKE BY GRAIN AND ACCUMULATION IN THE SOIL
MUHAMMAD ALI KHAN1*, T.G. KAZI2, R. ANSARI3, S.M. MUJTABA, B. KHANZADA, M.A. KHAN, M.U. SHIRAZI AND S. MUMTAZ
Abstract
The high nutrients and organic matter contents of sewage sludge make it an excellent fertilizer to enhance soil fertility and crop production. However, presence of metals is a major problem for such a utilization of sludge. In Pakistan, there are only two-sewage treatment plant, one in Islamabad and the other in Karachi. Due to not having sewage treatment facility, in the country on wide scale, usually sludge is directly mixed with agricultural soil. As the sewage sludge, produced in municipal station, is highly toxic, therefore, there is a danger for the uptake of toxic metals by plant and accumulation in the soil. The present study describes the effects of un-treated sewage sludge on wheat yield and uptake of metals by grain as well as addition of metals to the soil. The treatment consisted of sewage sludge @ 10
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