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On-line version ISSN 1678-4596
BACKES, Clarice et al. Use of sewage sludge in zoysiagrass production. Cienc. Rural [online]. 2009, vol.39, n.4, pp. 1045-1050. ISSN 1678-4596. http://dx.doi.org/10.1590/S0103-84782009000400014.
Aiming to evaluate sewage sludge effect in the grass sod qualitiy and formation it was installed in Itapetininha - SP one experiment using Zoysia japonica Steud. The experimental design adopted was randomized blocks with split plot design, with four replications, the main plots consisting of five doses of sludge (0, 10, 20, 30 and 40Mg ha-1, a dry basis), another treatment with NPK, according to the requirement of the culture, and subplots with two management systems (with and without chisel use, to break a compacted surface layer). The sludge used came from "Estação de Tratamento de Esgoto de Jundiaí/SP". The doses of sludge applied correspond to the doses of 100, 200, 300 and 400kg ha-1 of nitrogen. 165 days after sewage sludge application, the dose of 31Mg ha-1 allowed the complete closing (100% of soil cover rate) and greater resistance of the zoysiagrass sod. The same results were found when chemical fertilization was used. The control and the plots that received 10Mg ha-1 of sludge did not formed sod. The sewage sludge applied to surface promoted reduction of zoysiagrass sod mass. The use of surface chisel reduced the strength of zoysiagrass sod. The heavy metals values found in sewage sludge were below the limit set by the rules governing the sewage sludge use in agriculture.
Keywords : Zoysia japonica Steud.; nitrogen; soil cover; systems of handling.