Composted municipal waste and fertilizer effects on soils and sugarcane.

摘要

Application of composted municipal waste to agricultural lands has potential benefits to improve soil fertility and crop yield. It may lead to accumulation of heavy metals within soils and leaching of nutrients and heavy metals into the ground water. The objectives of this study were to investigate: (1) the effects of composted municipal waste and fertilizer on soil chemical properties and sugarcane elemental uptake and yield; and (2) the leachability of elements in compost amended soils.;Results of three field experiments from a Baldwin silty clay loam and a Memphis silt loam showed that compost application at ;Plant tissue and sugar juice data demonstrated that compost was beneficial for sugarcane growth and there was no heavy metal accumulation. Yield data indicate that compost application at ;The correlation analysis between extracted trace metals in soils and plant tissue digests showed that the increased heavy metals did not reflect the amounts taken up by sugarcane. This indicates that the DTPA method of soil metal extraction is a questionable index for the bioavailability of trace metals in compost amended soils.;Leaching experiments using soil columns showed that nutrient and heavy metal concentrations in leachate increased with increasing compost rate, but decreased with time. Concentrations of NO