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Asian Journal of Plant Sciences
Year: 2002  |  Volume: 1  |  Issue: 2  |  Page No.: 79 - 81

Influence of Sewage Sludge and Organic Manures Application on Wheat Yield and Heavy Metal Availability

Tahir Hussain Chatha, Rifat Hayat and Irum Latif    

Abstract: A field experiment was carried out to see the effects of sewage sludge and organic manures on heavy metals availability and wheat yield. The treatments included, control, NP fertilizers @ 100-75 kg ha-1, farmyard manure @ 25 t ha-1 , poultry manure @ 25 t ha-1 sewage sludge @ 25 t ha-1 , ½ FYM + ½ NP, ½ PM + ½ NP and ½ SS + ½ NP fertilizers. Highest increase in tiller length, number of grain spilke-1 and number of tiller plant-1 106.3 cm, 55.3 and 305 respectively were observed in the plots treated with ½ PM+ FERT. Highest yield (3424 kg ha-1) was obtained by the combined use of PM and NP-fertilizers (half the rate of each) followed by PM and NP-fertilizers applied singly. The results revealed that use of SS, PM, FYM or NP-fertilizers did not affect soil pH, ECe, but application of SS and PM to soil increased soil organic matter considerably. The organic matter went up from 0.48 (control) to 1.08 % in case of sewage treated soil and to 1.28 % in case of PM amended soils. Sewage sludge and PM amended soils were found to have significantly higher Cd contents (two-fold) than those of control. Plant contents of Cd did not change significantly with the application of SS, PM, FYM or NP-fertilizers to the soil. AB-DTPA extractable Pb was significantly increased (two-fold) by the soil application of SS and PM. But these treatments did not affect Pb contents in plants. No significant differences among the treatments could be detected for extractable Ni and Cr in soil and leaves of wheat crop.

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