Asian Journal of Plant Sciences1682-39741812-5697Asian Network for Scientific Information10.3923/ajps.2002.79.81ChathaTahir Hussain Rifat Hayat Irum Latif 2200212A 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.]]>Alloway, B.J. and D.C. Ayres,19972nd Edn.,pp: 208-211pp: 208-211Campbel, W.F., W.R. Miller, J.H. Reynolds and T.M. Schreeg,198312243249Clapp, C.E., S.A. Stark, D.E. Clay and W.E. Larson,19861986pp: 209-253pp: 209-253Couillard, D.,1994228396Higgins, J.A.,198413441448Krause, R.,19881988Lerch, R.N., K.A. Barbarick, D.G. Westfall and R.H. Follet,199036671Moore, Jr. P.A., T.C. Danniel, A.N. Sharpley and C.W. Wood,199550321327Soltanpour, P.N.,198516323338Steel, R.G.D. and J.H. Torrie,19802nd Edn.,Pages: 633Pages: 633Tisdale, S.L., W.L. Nelson and J.D. Beaton,19935th Edn.,Pages: 634Pages: 634