Impact of sugarcane cultivation on the biological attributes of oxisol in the brazilian savannah
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Data
2014-10
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Resumo
Sugarcane is fundamental for the energy matrix in Brazil. The evaluation of biochemical
attributes in different sugarcane production systems provides information on their environmental sustainability.
Altogether, soil biochemical attributes are considered very sensitive indicators of changes in soil properties and of
alterations caused by soil management and land-use systems. The aim of this work was to study the effect of organic and
conventional sugarcane cultivation systems on microbial soil properties. Changes in carbon (C) and nitrogen (N) microbial
and microbial activity were evaluated in a Cerrado Oxisol in the state of Goiás, Brazil, cultivated with sugarcane in three
different production systems: organic (Organic Cane - OC), conventional with burning (Burned Cane - BC), and
conventional without burning (Raw Cane - RC). The native Cerrado (NC) and other cultivated pasture (PT) were used as
references. The soil samples were collected during the dry and rainy seasons from two depths: 0-10 and 10-20 cm. The
chronological order of the implementation of the land-use (NC, PT and sugarcane) and cultivation (RC, BC, OC) systems
were: NC, PT, RC/BC, OC. The microbial biomass C (C SMB ), microbial biomass N (N SMB ), basal respiration (Br),
metabolic quotient (qCO 2 ) and the C SMB /C org , N SMB /N total and C SMB /N SMB ratios were determined. The different land-use
and cultivation systems influenced microbial biomass and activity. The replacement of conventional tillage for organic
system recovered C SMB and N SMB levels and improved recycling of nutrients in the microbial biomass (N SMB /N total ). The
conventional tillage system with burning (BC) was less efficient in use of energy and carbon (high qCO 2 ), resulting in a
loss of C-CO 2 to the atmosphere.
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Palavras-chave
Cerrado, Microbial C, Organic farming, Soil microbial biomass, Microbial N, qCO 2, Cerrado, Cultivo orgânico, Biomassa Microbiana do Solo, C Microbiano, N microbiano, qCO 2
Citação
BORGES, Lurdineide de Araújo Barbosa; RAMOS, Maria Lucrecia Gerosa; VIVALDI, Lúcio José; FERNANDES, Paulo Marçal; MADARI, Beata Emöke; SOARES, Rogério Augusto Bremm; FONTOURA, Patrícia Rezende. Impact of sugarcane cultivation on the biological attributes of oxisol in the brazilian savannah. Bioscience Journal, Uberlândia, v. 30, n. 5, p. 1459-1473, Sept./Oct. 2014.