Effects on the content of organic matter, nitrogen, phosphorus and heavy metals in soil and plants after application of compost and sewage sludge

abonos amendement du sol azote cadmio cadmium cinc cobre compost composts copper crops cuivre cultivos engrais enmiendas del suelo fertilizers field crops fosforo heavy metals italia italie italy lead loam soils lodos residuales mais maize metales pesados nitrogen phosphore phosphorus plante de culture plomb plomo remolacha azucarera rotation culturale rotational cropping sewage sludge soil amendments soil organic matter sol sablolimoneux suelo franco sugar beet trigo wheats zinc