Sewage Sludge Application in Eucalyptus urograndis Plantation: Availability of Phosphorus in Soil and Wood Production
Nenhuma Miniatura disponível
Data
2020-07-28
Autores
Abreu-Junior, Cassio Hamilton
Oliveira, Marcelo Gomes de
Silveira Cardoso, Paulo Henrique
Mandu, Thays da Silva
Florentino, Antonio Leite
Oliveira, Fernando Carvalho
Reis, Josimar Vieira dos
Alvares, Clayton Alcarde
Stape, Jose Luiz
Rodrigues Nogueira, Thiago Assis [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Frontiers Media Sa
Resumo
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.
Descrição
Palavras-chave
alternative fertilizers, biosolids, organic fertilizer, P fractionation, soil P lability
Como citar
Frontiers In Environmental Science. Lausanne: Frontiers Media Sa, v. 8, 14 p., 2020.