Anais do XXXV Congresso Brasileiro de Ciência do Solo
MINERAL FERTILIZERS AND SEWAGE SLUDGE TO INCREASE WOOD PRODUCTION IN EUCALYPTUS PLANTATIONS IN TROPICAL SOIL
CASSIO HAMILTON ABREU-JUNIOR(1); LUCIA PITTOL FIRME(4); CARLOS ALBERTO BACA MALDONADO(2); SEBASIÃO PIRES DE MORAES NETO(3); ANTONIO LEITE FLORENTINO(4); VERÓNICA ASENSIO FANDIñO(4); 1 - UNIVERSIDADE DE SÃO PAULO / CENTRO DE ENERGIA NUCLEAR NA AGRICULTURA - USP/CENA; 2 - UNIVERSIDADE FEDERAL DA GRANDE DOURADOS; 3 - EMBRAPA CERRADO.; 4 - USP/CENA;
Effects of sludge and N and P fertilizer application on the Eucalyptus wood volume yielded up to 44 months after planting, and the time needed for the wood production of 150 m3 ha 1 were evaluated. Rates of sludge (0, 8, 15 and 23 Mg ha-1, dry base), N (0, 47, 95, and 142 kg ha 1) and P2O5 (0, 28, 56 and 84 kg ha-1) were combined in a 4 x 4 x 4 factorial scheme, in a randomized block design, with two replications. From 8 to 44 months after planting, the sludge application, with or without N and P, yielded wood volume ranging from 0.6 to 192 m3 ha-1, which was larger than the volume ranging from 0.4 to 166 m3 ha-1 obtained with the application of N and P fertilizers. The response surface study was the basis for a recommendation of N and P fertilizer doses for Eucalyptus treated with sludge. The application of sludge on the N criterion reduces the need of N and P fertilizers by 100%, and, if two third of recommended P were applied, increases wood volume by 7% in comparison with the volume yielded by application of NPK fertilizer. The cultivation time to produce 150 m3 ha-1 of wood volume was 45 months for control, and reduced by two, three, four, or five months, respectively, through application of recommended P, sludge recommended dose, sludge plus one third of P, and sludge plus two third of P.
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