Jader Galba Busato1, Gabriella Papa2, Luciano Pasqualoto Canellas3, Fabrizio Adani2, Aline Lima de Oliveira4, Tairone Paiva Leão1. 1. Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Caixa Postal 4508, CEP 70910-970, Brasília, (DF), Brazil. 2. Gruppo RICICLA, Dipartimento di Produzione Vegetale, Università degli Studi di Milano, Via Celoria 02, I-20133, Milan (MI), Italy. 3. NUDIBA, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Avenida Alberto Lamego, 2000, CEP 28013-303, Campos dos Goytacazes, (RJ), Brazil. 4. Instituto de Química, Universidade de Brasília, Campus Universitário Darcy Ribeiro, CEP 70910-970, Brasília, (DF), Brazil.
Abstract
BACKGROUND: Recycling of phosphorus (P) from organic residues (ORs) is important to develop environmentally friendly agriculture. The use of this P source depends on phosphatase enzymes, which can be affected by a chain of parameters during maturation of ORs. In this study the phosphatase activity levels throughout vermicomposting of filter cake (FC) and cattle manure (CM) were correlated with different physical and chemical parameters in an effort to increase the knowledge about recycling of P from ORs. RESULTS: FC presented higher total nitrogen content (TNC), total organic carbon (TOC), humic acid (HA) content, water-soluble P (WSP), phosphatase activities and nanopore volume than CM during vermicomposting. Decreases in TOC of CM resulted from carbohydrate mineralization, which was not observed for FC. CM showed increased hydrophobic index during vermicomposting while FC showed a slight decrease. CONCLUSION: Phosphatase activities correlated positively with TOC, pH and WSP and negatively with HA content for both vermicomposts. Nanopore volume was negatively correlated with phosphatase activities for FC but not for CM. No correlations between hydrophobicity and phosphatase activities were found for FC. Increased hydrophobicity throughout vermicomposting of CM could be partially associated with decreases in phosphatase levels.
BACKGROUND: Recycling of phosphorus (P) from organic residues (ORs) is important to develop environmentally friendly agriculture. The use of this P source depends on phosphatase enzymes, which can be affected by a chain of parameters during maturation of ORs. In this study the phosphatase activity levels throughout vermicomposting of filter cake (FC) and cattle manure (CM) were correlated with different physical and chemical parameters in an effort to increase the knowledge about recycling of P from ORs. RESULTS: FC presented higher total nitrogen content (TNC), total organic carbon (TOC), humic acid (HA) content, water-soluble P (WSP), phosphatase activities and nanopore volume than CM during vermicomposting. Decreases in TOC of CM resulted from carbohydrate mineralization, which was not observed for FC. CM showed increased hydrophobic index during vermicomposting while FC showed a slight decrease. CONCLUSION: Phosphatase activities correlated positively with TOC, pH and WSP and negatively with HA content for both vermicomposts. Nanopore volume was negatively correlated with phosphatase activities for FC but not for CM. No correlations between hydrophobicity and phosphatase activities were found for FC. Increased hydrophobicity throughout vermicomposting of CM could be partially associated with decreases in phosphatase levels.
Authors: Jader Galba Busato; Caroline Moreira de Carvalho; Daniel Basilio Zandonadi; Fernando Fabriz Sodré; Alan Ribeiro Mol; Aline Lima de Oliveira; Rodrigo Diana Navarro Journal: Environ Sci Pollut Res Int Date: 2017-11-23 Impact factor: 4.223