title: Compost biofortification with diazotrophic and P-solubilizing bacteria improves maturation process and P availability.
abstract: BACKGROUND
  Phosphorus-containing fertilizers play an important role in tropical agriculture owing to the well documented shortage of plant-available P in soils. Traditional P fertilizer production is based on chemical processing of insoluble rock phosphate (RP), which includes an acid treatment at high temperature. Processing the RP increases fertilizer costs, making it unavailable for undercapitalized and typically family-based farmers. Biotechnological methods have been proposed as an alternative to increase phosphate availability in RP. In this study, Burkholderia silvatlantica and Herbaspirillum seropedicae were co-inoculated into an RP-enriched compost with the aim of determining the effects of this technology on the levels of phosphatase activities and release of plant-available P.
  
  
  RESULTS
  Inoculation of both microorganisms resulted in higher organic matter decomposition and higher humic acid formation in composting. Herbaspirillum seropedicae was the most promising microorganism for the production of acid and alkaline phosphatase enzymes. Both microorganisms presented potential to increase the supply of P from poorly soluble sources owing to increased levels of water-soluble P and citric acid P.
  
  
  CONCLUSIONS
  Burkholderia silvatlantica and H. seropedicae in RP-enriched compost may represent an important biotechnological tool to reduce the overall time required for composting and increase the supply of P from poorly soluble sources. © 2016 Society of Chemical Industry.
authors.affiliation: Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Caixa Postal 4508, CEP, 70910-970, Brasília/DF, Brazil.
authors.forename: Jader G
authors.initials: JG
authors.lastname: Busato
authors.affiliation: Empresa Brasileira de Pesquisa Agropecuária, Centro Nacional de Pesquisa de Hortaliças, Rodovia BR-060, Km 09, Caixa Postal 218, CEP, 70351-970, Brasília/DF, Brazil.
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Zandonadi
authors.affiliation: Universidade de Brasília - UnB. Instituto de Química, Campus Universitário Darcy Ribeiro - Asa Norte, CEP, 70910-970, Brasília/DF, Brazil.
authors.forename: Alan R
authors.initials: AR
authors.lastname: Mól
authors.affiliation: Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Caixa Postal 4508, CEP, 70910-970, Brasília/DF, Brazil.
authors.forename: Rafaela S
authors.initials: RS
authors.lastname: Souza
authors.affiliation: Universidade Estadual do Norte Fluminense, Núcleo de Insumos Biológicos para Agricultura, Av. Alberto Lamego, 2000, CEP, 28013-602, Campos dos Goytacazes/RJ, Brazil.
authors.forename: Kamilla P
authors.initials: KP
authors.lastname: Aguiar
authors.affiliation: Empresa Brasileira de Pesquisa Agropecuária, Centro de Pesquisa Agropecuária dos Cerrados, Rodovia BR-020, Km 18, Caixa Postal 08223, CEP, 73310-970, Planaltina/DF, Brazil.
authors.forename: Fábio B Reis
authors.initials: FB
authors.lastname: Júnior
authors.affiliation: Universidade Estadual do Norte Fluminense, Núcleo de Insumos Biológicos para Agricultura, Av. Alberto Lamego, 2000, CEP, 28013-602, Campos dos Goytacazes/RJ, Brazil.
authors.forename: Fábio L
authors.initials: FL
authors.lastname: Olivares
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D059827:Agricultural Inoculants / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism*; D000469:Alkaline Phosphatase / Q000378:metabolism; D001426:Bacterial Proteins / Q000378:metabolism; D000072759:Biofortification / Q000379:methods*; D001938:Brazil; D019117:Burkholderia / Q000201:enzymology* / Q000254:growth & development / Q000378:metabolism; D018556:Crops, Agricultural / Q000191:economics / Q000254:growth & development / Q000378:metabolism; D003906:Developing Countries; D005308:Fertilizers / Q000191:economics; D042803:Herbaspirillum / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism*; D006812:Humic Substances / Q000032:analysis / Q000191:economics / Q000382:microbiology; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009586:Nitrogen Fixation; D010710:Phosphates / Q000737:chemistry / Q000378:metabolism*; D012988:Soil Microbiology; D012995:Solubility
chemical_list: D001426:Bacterial Proteins; D005308:Fertilizers; D006812:Humic Substances; D010710:Phosphates; D000469:Alkaline Phosphatase; D000135:Acid Phosphatase
keywords: biotechnological methods; low-cost fertilizers; microbial inoculation; organic matter degradation