Growth of eucalyptus seedlings irrigated with different wastewaters

摘要

This study aimed to evaluate the growth of two species and one eucalyptus hybrid irrigated with different wastewaters. The experiment was carried out in a greenhouse in a completely randomized split-plot experimental design with three replications. The effluent included: Urban source, beef cattle slaughterhouse, poultry/swine slaughterhouse and soy processing/dairy plant from the wastewater treatment plants (WWTPs). In the subplot, the wastewater was diluted to the concentrations of 0, 25, 50, 75 and 100%. In the subplot, two species (Eucalyptus citriodora and Eucalyptus urophylla) and a eucalyptus hybrid (Eucalyptus urophylla x Eucalyptus grandis) were tested. The following physiological attributes were evaluated: mortality, root area, leaf area, stem diameter, plant height, green matter mass and dry matter weight. The results showed that the water from the beef cattle slaughterhouse WWTP, at 50% concentration, impaired growth of genotypes and promoted higher mortality values. As the concentrations of the four wastewater types increased, there was a significant variation for all characteristics except for: leaf area, plant height and dry matter weight with the soy processing/dairy WWTP water. The tested waters might be used in seedling irrigation of the two Eucalyptus plant species and the hybrid.