Cultivation of sorghum and sunfower in soils with amendment of sludge from industrial landfll


1 Soil Department, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil

2 Engineering Center, UFPel, Pelotas, Brazil


Purpose The purpose of this work was to evaluate the impacts of the amendment of industrial landfll sludge (ILS) in two diferent soils with cultivation of sunfower and sorghum plants. Methods The plants grew in two types of soils (Typic Paleudult—TP, and Grossarenic Hapludult—GH) with diferent doses of ILS (0, 2, 5, 10, and 20 Mg ha−1). The evaluation of the pH, electrical conductivity, available concentrations of P, K, Ca, Mg, and Na, and the hydrolysis of FDA in the soils were tested. The height and dry mass of both plants were measured, as well as the stem diameter of the sunfower. The total concentration of Cu, Cd, Cr, and Pb was evaluated in the plants and soils, in addition to the translocation factor of those in the plants. Results The amendment of ILS in the soils was efcient to increase the pH and macronutrients, as to increase the biomass production. The largest production occurred with 10 Mg ha−1, and the highest dose (20 Mg ha−1) had negative efects in all treatments. Both plants had low accumulation of Cu, Cd, and Pb in their tissues. Cr increased in the roots of sunfower plants (especially in the TP soil) without translocation to the shoots. Conclusions The amendment of ILS in soils is an alternative to disposal with benefts to plants and soil quality. TP soil presented better results, being more secure to receive the sludge due to its higher content of clay when compared to the GH soil.