Journal of Food, Agriculture and Environment

Dynamic of organic carbon in a clayey oxisol under tillage systems

Author(s):

Deonir Secco*, Araceli Ciotti de Marins, Reginaldo Ferreira Santos, Samuel Nelson Melegari de Souza, Augustinho Borsoi, Elisandro Pires Frigo

Recieved Date: 2011-11-03, Accepted Date: 2012-01-14

Abstract:

The soil’s organic matter is of fundamental importance for the improvement of the structure and retention of water and nutrients. This essay aims at evaluating the dynamic of organic matter in a clayey oxisol under three tillage systems, five periods and in five depths. The experiment was conducted in the Experimental Nucleus of Agricultural Engineering in the State University of Western Paraná (UNIOESTE), in the city of Cascavel, Paraná, Brazil, in a red latosol (usually known as oxisol) from clayey to very clayey texture (600 g kg^-1 clay; 320 g kg^-1 silt; and 80 g kg^-1 sand) basalt substrate and soft-wavy relief. The area is geographically set by the coordinates 24º48’ south latitude and 53º26’ west longitude, 760 m average height. The treatments were composed of three soil tillage systems: CT conventional tillage = disc plowing followed by harrowing to level; RT reduced tillage = scarification without a following harrowing to level; and, at last, NT no-till farming = implantation of crops on the stubble of the previous crop. The depths of soil sample extractions, for the determination of organic carbon content, in each tillage system, were as follows: 0.0-0.025; 0.025-0.05; 0.05-0.10; 0.10-0.20, and 0.20-0.30 m. Organic carbon content was determined in accordance with the Walkjey Black methodology, from years 2006 to 2010. The experimental design used was a 5×3×5 factorial (five periods, three tillage systems and five depths). Tukey’s test was applied to compare the average of treatments, with the significance level at 5%. After five years, NT showed an increase of 3.5% and 4.8% in organic carbon contents, related to CT and to RT, respectively.

Keywords:

Conventional tillage, reduced tillage, no tillage, organic carbon

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 1
Category: Environment
Pages: 1024-1025

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