Effect of sewage sludge on soil fertility and on the nutritional quality of durum wheat (Triticum durum, waha variety)

Abstract

In aims to assess the effect of increasing doses of sludge on the nutritional quality of the durum wheat and on soil fertility. An experiment was carried out in a green house in Faculty of Exact Sciences and Natural and Life Sciences at the University of Tébessa. Four levels of sewage sludge (control = 0 g of sludge/pot; B1 = 120 g of sludge/pot, B2 = 300 g of sludge /pot, B3 = 600gof sludge/pot) were brought into plastic pots; each dose is reproduced in three repetitions. The results revealed significant increase in the humidity of the wheat seed which amended by the sludge. Plants treated with sludge accumulate more ash, nitrogen and fatty acidity compared to control plants. The sewage sludge improves soil fertility; the results have shown an increase in organic matter, nitrates and phosphorus. In addition, the electrical conductivity reveals a strong accumulation of salts in the pots amended by the sewage sludge in comparison with the control.