The effects of biosolid application on soil chemical properties and Zea mays nutrition

Background: The application of biosolid as a fertilizer in agricultural cultivation is a common practice in manycountries. This study investigates the effects of sewage sludge and compost usage on soil chemical properties andZea mays nutrition in comparison with those of iron and manganese sulfate solution. The experiment was carriedout in a completely randomized block design with the following treatments: sewage sludge and compost withthree levels (0, 25 and 50 t ha−1) and iron and manganese sulfate solution (1 g l−1 solution) with three replications.Results: The application of sewage sludge (50 t ha−1) had highly significant (P<0.01) positive effects on cationexchange capacity and organic matter, total nitrogen, phosphorus, iron and manganese diethylenetetramine-pentaaceticacid-extractable in soil, and nitrogen, phosphorus, iron and manganese in plant. Also, compost application(50 t ha−1) increased significantly (P<0.01) the electrical conductivity in soil and potassium in soil and plant. Drybiomass increased significantly (P<0.01) from 7.7 to 28.7 g per pot with sewage sludge application (50 t ha−1).Conclusions: Application of biosolid as fertilizer sources has become a common practice in Iran, especially in theagricultural lands. The reuse of these nutrients had some beneficial effects on soil fertility, such as increased cationexchange capacity, pH, organic matter, total nitrogen, phosphorous, iron and manganese. However, these benefitswere limited by the presence of some potentially toxic trace metals in biosolid.

Keywords:

Sewage sludge , Compost , Iron , Manganese , Zea mays , Plant nutrition