Papers

Influence of liming on residual soil respiration and chemical properties in a tropical no-tillage system.

Author: Adolfo Valente Marcelo, José Eduardo Corá, Newton La Scala Júnior

Keywords: soil CO2 emission, limestone, soil fertility.

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Summary

Because of the climate changes occurring across the planet, especially global warming, the different forms of agricultural soil use have attracted researchers´ attention. changes in soil management may influence soil respiration and, consequently, c sequestration. the objectives of this study were to evaluate the long-term influence of liming on soil respiration and correlate it with soil chemical properties after two years of liming in a no-tillage system. a randomized complete block design was used with six replications. the experimental treatments consisted of four lime rates and a control treatment without lime. Two years after liming, soil co2 emission was measured and the soil sampled (layers 0–5, 5–10, 10–20, and 20–30 cm). the p, ca2+ e mg2+ soil contents and ph and base saturation were determined. co2 emission from soil limed at the recommended rate was 24.1 % higher, and at twice the recommended rate, 47.4 % higher than from unlimed soil. liming improved the chemical properties, and the linear increase in soil respiration rate correlated positively with the p, ca2+ and mg2+ soil contents, ph and base saturation, and negatively with h + al and al3+ contents. the correlation coefficient between soil respiration rate and chemical properties was highest in the 10–20 cm layer.