Indicadores microbiológicos e bioquímicos da qualidade do solo em transição para cultivo orgânico de feijoeiro comum (Phaseolus vulgaris L.)
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2009-05-30
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Universidade Federal de Goiás
Resumo
The soil quality indicators analyses during and after the transition period of
conventional to organic production system are very important to evaluated the
sustainability of agricultural systems. Soil microbiological and biochemical indicators
shall quickly indicate changes occurred on both, soil management and production
systems. The objective of this work was to evaluated shifts on microbiological and
biochemical soil indicators of a conventional common bean production system in
transition to an organic system, under conventional and non-tillage soil management
systems after cover crops. Total enzymatic activity (AET), betaglucosidase activity
(betaglucosidase), acid fosfatase activity (fosfatase), carbon (CBM) and nitrogen
(NBM) of the microbial biomass, the basal soil respiration (RBS) and the metabolic
quotient (qCO2) were evaluated on soil samples collected at tillage common bean cycle.
The experiment was carried out at Embrapa Rice and Beans, in Santo Antônio de Goiás
GO, and it was also collected soil samples in a secondary forest area close to the
experiment to be used as a reference. The content of carbon and nitrogen of the soil
microbial biomass, as well as, microbial and enzymatic activities in conventional and
non-tillage systems were independent of the cover crop specie used. Under the
experimental conditions, the soil management systems did not show effect in the
enzymatic and microbial soil activities. The total and acid fosfatase enzymatic activities
of the cropped soils were lower than in the forest soil. The betaglucosidase enzymatic
activity was higher in cropped soil than under forest soil in the raining season and lower
in the dry season. The soil tillage performed before common bean sowing promoted
shifts on the CO2 efflux from soil to the atmosphere, which was verified by an increase
on both, basal soil respiration and metabolic quotient.
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ROSA, Joyce Rover. Microbiological and biochemical indicators of the quality of
ground transitioning to organic cultivation of common bean
(Phaseolus vulgaris L.). 2009. 86 f. Dissertação (Mestrado em Ciências Biolóicas) - Universidade Federal de Goiás, Goiânia, 2009.