World Congress of Soil Science Logo 18th World Congress of Soil Science
July 9-15, 2006 - Philadelphia, Pennsylvania, USA
International Union of Soil Sciences

Friday, 14 July 2006

This presentation is part of 99: 1.2B Soil System Behavior in Time - Theater

Chemical Properties of an Oxisol under Long-term No Till and Conventional Till Systems.

Maria de Fátima Guimarães1, Cibele Masciolli R. Portella2, Osmar R. Brito1, Christian Feller3, Carmen S. V. J. Neves1, and Jerry Ritchie4. (1) UEL, Agronomy Dept, PB 6001, Londrina, 86051-990, Brazil, (2) State University of Londrina, Rod Celso Garcia Cid s/n, Londrina, Brazil, (3) IRD, Bp 64501, Montpellier Cedex 5, 34394, France, (4) ARS-BARC-HRSL, 10300 Baltimore Ave, Beltsville, MD 20705

The use of soil for agricultural purposes changes the chemical balance and generally increases nutrient and Soil Organic Carbon (SOC) loss. This study assessed the effects of 20 years of no-till and conventional till management systems on the chemical properties of a Typic Haplorthox, using a forest soil as a reference. Soil samples were collected from depths 0-5, 5-10, 10-20 and 20-40 cm, with six replications. The pH, cation exchange capacity, base saturation, available phosphorus, exchangeable calcium, magnesium and potassium, total SOC and total nitrogen were measured. The highest concentrations for these variables were found in forest soils. Total mass of SOC calculated in the 0-20 cm layer was also greatest under forest. The no-till soils had higher concentrations of the measured variables than the conventional till soils. Soil management systems that minimize soil disturbance and take into consideration the use of crop residues are the useful alternatives, especially for farms with low investment capacity.

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