Abstract
<!-- @page { margin: 2cm } P { margin-bottom: 0.21cm } --> This study aimed to characterize the chemical and microbiological soil as microbial carbon biomass (MCB), released carbon dioxide (C-CO2), mycorrhizal colonization (COL), and Brachiaria brizantha dry matter production (DMP), at different sampling periods. The test areas were located in four farms on the São Paulo State, Brazil: São José da Barra (51°07'59,02";W and 20°25'24,82";S), Valência (51°07'10,38";W and 20°27' 59,96";S), Primavera (50°59'44,02";W and 20°31'17,42";S) and Gior (50°59'19,00";W and 20°31'25,31";S). The predominant soil was a eutrophic red-yellow podzolic, for the S. J. da Barra, Valência, and Primavera farms, and an alic red-yellow podzolic for the Gior farm. The highest values for MCB were found on Apr./2003, with no differences between areas; for released C-CO2, highest values were showed on Aug./2002, at S. J. da Barra; highest DMP values were found on Aug./2002, at the Primavera; the highest COL values were obtained in Jul./2003, and the highest spore numbers were counted on Apr./2003, both in the S. J. da Barra. Despite the acid soil condition in all farms, as well as low nutrient content and moderate organic matter levels, the values for microbiological variables and DMP ranges from satisfactory to highly satisfactory. However, considering the areas histories, the necessity of chemical management in those areas is evident. KEY-WORDS: Arbuscular micorrhyzal fungi; microbial biomass carbon; released C-CO2.carbon; released C-CO2. <!-- @page { margin: 2cm } P { margin-bottom: 0.21cm } --> O trabalho teve por objetivo a caracterização química e microbiológica do solo, em termos do carbono da biomassa microbiana (CBM), do dióxido de carbono (C-CO2) liberado e colonização micorrízica (COL), bem como da produção de massa seca da parte aérea (MSPA) por Brachiaria brizantha, em diferentes épocas de amostragem. As áreas de teste estiveram localizadas em quatro fazendas na região noroeste do Estado de São Paulo: São José da Barra (51°07'59,02"W e 20°25'24,82"S), Valência (51°07'10,38"W e 20°27'59,96"S), Primavera (50°59'44,02"W e 20°31'17,42"S) e Gior (50°59'19,00"W e 20°31'25,31"S). O solo predominante é o argissolo vermelho-amarelo eutrófico, para S. J. da Barra, Valência e Primavera, e álico para Gior. Os valores mais elevados de CBM ocorreram em abr./2003, não existindo diferenças entre áreas; os de C-CO2 liberado, em ago./2002, para S. J. da Barra; os de MSPA, em ago./2002, para Primavera; os de COL, em jul./2003; e os de esporos, em abr./2003, para S. J. da Barra. Apesar da condição de solos ácidos predominante em todas as fazendas, bem como os baixos teores de nutrientes e níveis médios de matéria orgânica, os valores das variáveis microbiológicas e de MSPA podem ser considerados como satisfatórios ou altos. Entretanto, considerando o histórico das áreas, ficou evidente a necessidade de manejo químico adequado às áreas. PALAVRAS-CHAVE: Fungo micorrízico arbuscular; carbono de biomassa microbiana; carbono do CO2 liberado.
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Claims 7
Claim · model-written summary
MCB was highest in Apr./2003.
- Taxon
- Brachiaria brizantha
Urochloa brizanthat0 - Outcome
- MCBe0
- Direction
- higheste0
- Qualifier
- Apr./2003e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AND Brachiaria brizantha BIOMASS”
e0“The highest values for MCB were found on Apr./2003, with no differences between areas; for released C-CO2, highest values were showed on Aug./2002, at S. J. da Barra; highest DMP values were found on Aug./2002, at the Primavera; the highest COL values were obtained in Jul./2003, and the highest spore numbers were counted on Apr./2003, both in the S. J. da Barra”
Claim · model-written summary
released C-CO2 was highest in Aug./2002 at S. J. da Barra.
- Taxon
- Brachiaria brizanthaUrochloa brizanthat0
- Outcome
- released C-CO2e0
- Direction
- higheste0
- Qualifier
- Aug./2002e0
- Setting
- S. J. da Barrae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AND Brachiaria brizantha BIOMASS”
e0“The highest values for MCB were found on Apr./2003, with no differences between areas; for released C-CO2, highest values were showed on Aug./2002, at S. J. da Barra; highest DMP values were found on Aug./2002, at the Primavera; the highest COL values were obtained in Jul./2003, and the highest spore numbers were counted on Apr./2003, both in the S. J. da Barra”
Claim · model-written summary
DMP was highest in Aug./2002 at Primavera.
- Taxon
- Brachiaria brizanthaUrochloa brizanthat0
- Outcome
- DMPe0
- Direction
- higheste0
- Qualifier
- Aug./2002e0
- Setting
- Primaverae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AND Brachiaria brizantha BIOMASS”
e0“The highest values for MCB were found on Apr./2003, with no differences between areas; for released C-CO2, highest values were showed on Aug./2002, at S. J. da Barra; highest DMP values were found on Aug./2002, at the Primavera; the highest COL values were obtained in Jul./2003, and the highest spore numbers were counted on Apr./2003, both in the S. J. da Barra”
Claim · model-written summary
COL was highest in Jul./2003 at S. J. da Barra.
- Taxon
- Brachiaria brizanthaUrochloa brizanthat0
- Outcome
- COLe0
- Direction
- higheste0
- Qualifier
- Jul./2003e0
- Setting
- S. J. da Barrae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AND Brachiaria brizantha BIOMASS”
e0“The highest values for MCB were found on Apr./2003, with no differences between areas; for released C-CO2, highest values were showed on Aug./2002, at S. J. da Barra; highest DMP values were found on Aug./2002, at the Primavera; the highest COL values were obtained in Jul./2003, and the highest spore numbers were counted on Apr./2003, both in the S. J. da Barra”
Claim · model-written summary
spore numbers was highest in Apr./2003 at S. J. da Barra.
- Taxon
- Brachiaria brizanthaUrochloa brizanthat0
- Outcome
- spore numberse0
- Direction
- higheste0
- Qualifier
- Apr./2003e0
- Setting
- S. J. da Barrae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AND Brachiaria brizantha BIOMASS”
e0“The highest values for MCB were found on Apr./2003, with no differences between areas; for released C-CO2, highest values were showed on Aug./2002, at S. J. da Barra; highest DMP values were found on Aug./2002, at the Primavera; the highest COL values were obtained in Jul./2003, and the highest spore numbers were counted on Apr./2003, both in the S. J. da Barra”
Claim · model-written summary
Microbiological variables and dry matter production were satisfactory to highly satisfactory despite acidic, low nutrient soils.
- Taxon
- Brachiaria brizanthaUrochloa brizanthat0
- Outcome
- microbiological variables and DMPe0
- Direction
- satisfactory to highly satisfactorye0
- Qualifier
- acid soil conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AND Brachiaria brizantha BIOMASS”
e0“Despite the acid soil condition in all farms, as well as low nutrient content and moderate organic matter levels, the values for microbiological variables and DMP ranges from satisfactory to highly satisfactory”
Claim · model-written summary
The authors recommend chemical management of the study areas.
- Taxon
- Brachiaria brizanthaUrochloa brizanthat0
- Outcome
- chemical managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“AND Brachiaria brizantha BIOMASS”
e0“However, considering the areas histories, the necessity of chemical management in those areas is evident”