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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/31610
Title: 
Microbial populations and activities in sewage sludge and phosphate fertilizer-amended soil
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
ISSN: 
0929-1393
Abstract: 
A greenhouse study was conducted to determine the number of microbial populations and activities in sewage sludge and phosphate fertilizer-amended dark red latosoil for cultivation of tomato plants. Sewage sludge was applied at doses of 0, 10, 20, 40, 80 and 160 t ha(-1), and phosphate (P2O5) at doses of 0, 100, 200, 400 and 800 kg ha(-1). The bacterial populations increased as a function of sewage sludge and phosphate application. Fungal populations were not affected by the application of phosphate alone but were increased by the application of sewage sludge. Phosphate doses higher than 100-200 kg ha(-1) in combination with sewage sludge inhibited both bacterial and fungal growth. The responses determined by microbial counts were reflected in the microbial biomass values, with a more significant effect of sewage sludge than of phosphate or of a combination of both. These results confirm the need for a carbon and energy source (represented here by sewage sludge) for microbial growth in a soil poor in organic matter. Dehydrogenase and urease activities reflected the results of the microbial populations due to the effect of sewage sludge and phosphate, but no satisfactory result was obtained for phosphatase. Urease activity was expressed by a linear regression equation as the result of the effect of sewage sludge, and by a quadratic regression equation as the result of the effect of phosphate. All parameters investigated showed a significant correlation with bacterial counts but not with fungal counts, indicating a greater effect of sewage sludge and phosphate on bacteria than on fungi.
Issue Date: 
1-Jul-1996
Citation: 
Applied Soil Ecology. Amsterdam: Elsevier B.V., v. 4, n. 1, p. 75-82, 1996.
Time Duration: 
75-82
Publisher: 
Elsevier B.V.
Keywords: 
  • bacteria
  • fungi
  • microbial biomass
  • enzyme activity
  • sewage sludge
  • triple phosphate
Source: 
http://dx.doi.org/10.1016/0929-1393(96)00094-7
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/31610
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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