Phosphate fertilizers used in planted forests mainly come from scarce and non-renewable sources, and there is a need for new sources of phosphorus (P). An alternative is the use of sewage sludge (SS), rich in organic matter, nitrogen, and P. The objectives were to evaluate the soil P availability and its effect on wood production in 22-month-old Eucalyptus urograndis plantation treated with SS. A field experiment was set up in a randomized complete block design, four replicates, with the following treatments: control without fertilization; mineral fertilization (MF); 14.5 Mg ha–1 of SS + 22 kg ha–1 of P (S1P1); 29 Mg ha–1 of SS (S2); 29 Mg ha–1 of SS + 17.5 kg ha–1 of P (S2P2); and 43.5 Mg ha–1 of SS (S3), dry base. Of the total P in SS, 65% was in organic form and 42% was in labile + moderately labile forms. S2P2 and S3 positively altered the pattern of soil P distribution, with more P in the labile and moderately labile fractions than in the non-labile fraction, along 0–20 cm depths, than MF and control. There were higher microbial and available P as a function of SS dose. Wood volume and biomass were highly related to soil P availability as a function of SS dose. Within the SS treatments, S2P2 resulted in higher gains of volume and biomass of wood. The SS application at the recommend rate, supplemented with 66% of recommended P fertilizer dose in Eucalyptus plantations, can reduce the use of P fertilizer by 33% and N fertilizer by 100% and maintain comparable soil P availability and wood production.
Sewage Sludge Application in Eucalyptus urograndis Plantation: Availability of Phosphorus in Soil and Wood Production / Abreu-Junior, C. H.; Oliveira, M. G. D.; Cardoso, P. H. S.; Mandu, T. D. S.; Florentino, A. L.; Oliveira, F. C.; Reis, J. V. D.; Alvares, C. A.; Stape, J. L.; Nogueira, T. A. R.; Capra, G. F.; He, Z.. - In: FRONTIERS IN ENVIRONMENTAL SCIENCE. - ISSN 2296-665X. - 8:116(2020), pp. 1-1. [10.3389/fenvs.2020.00116]