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RESEARCH ARTICLE
Contents Vol 48(3)

Soil organic carbon and biological indicators in an Acrisol under tillage systems and organic management in north-eastern Brazil

Luiz F. C. Leite A C , Francisco C. Oliveira A , Ademir S. F. Araújo B , Sandra R. S. Galvão A , Janyelle O. Lemos A and Elzane F. L. Silva B
+ Author Affiliations
- Author Affiliations

A Embrapa Mid-North, Av. Duque de Caxias, 5650, Teresina, PI 64006-220, Brazil.

B Universidade Federal do Piauí, Centro de Ciências Agrárias, Campus da Socopo, Teresina, PI, Brazil.

C Corresponding author. Email: luizf@cpamn.embrapa.br

Australian Journal of Soil Research 48(3) 258-265 https://doi.org/10.1071/SR09122
Submitted: 8 July 2009  Accepted: 17 December 2009   Published: 6 May 2010

Abstract

No-tillage and organic farming are important strategies to improve soil quality. This study aimed to quantify the effects of the tillage systems and organic management on total organic carbon (TOC), labile C (CL), and biological indicators in an Acrisol in north-eastern Brazil. Five systems were studied: NV, native vegetation; NT/ORG, no-tillage plus organic fertiliser; NT/CHE, no-tillage plus chemical fertiliser; NT/CHE/ORG, no-tillage plus organic and chemical fertiliser; CT/CHE, conventional tillage plus chemical fertiliser. Soil samples were collected in the 0–0.10 and 0.10–0.20 m depths. TOC stocks were higher in NT/CHE/ORG (0–0.10 m, 14.0 Mg/ha; 0.10–0.20 m, 13.0 Mg/ha) and NT/ORG (0–0.10 m, 12.6 Mg/ha; 0.10–0.20 m, 11.6 Mg/ha) than in CT/CHE and NV systems. CL stocks were higher in NT/ORG (3.61 Mg/ha) at 0–0.10 m and in NT/ORG, NT/CHE, and NT/CHE/ORG at 0.10–0.20 m. At 0–0.10 m, microbial biomass C content was higher in the NT/CHE/ORG (190 mg/kg) and NT/ORG (155 mg/kg). Soil microbial respiration rate was similar in all systems. However, qCO2 was higher in the NT/CHE and CT/CHE systems, suggesting a stress in the soil microbial biomass. No-tillage and organic management promoted positive changes in soil organic carbon and soil microbial properties and improved soil quality.

Additional keywords: carbon sequestration, microbial activity, microbial biomass, no-tillage, fertiliser.


Acknowledgments

Authors acknowledge CNPq (National Council of Research and Development, Brazil) for the respective fellowship awarded to Luiz F. C. Leite and Ademir S. F. Araújo.


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