Use of sludge from the water treatment plant for production of seedlings of Eucalipto

The objective of this study is to test the feasibility of using the sludge that forms on decanter and floculater walls of the Water Treatment Plant (WTP) in the composition of substrate for production of E. urophylla x E. grandis (E. "urograndis") hybrid seedlings. The method of propagation used was minicutting in four 50 cm 3 streaks tubes. The experiment was carried out in CENIBRA greenhouse under nursery conditions from March to May 2009, in a completely randomized design (CRD), with 11 treatments and 4 replications of 11 plants each. The percentage of rooting, the height of the shoot, stem diameter, dry matter of shoot, dry matter of roots and root length were evaluated. The WTP sludge can be applied as a substrate compound for E. "urograndis" seedlings production up to a rate of 50%.