Resumo

CASTILLO F, Jesús A; NAVIA E, Jorge F  e  MENJIVAR F, Juan C. Estimation of the structural stability of two soils of the south of Colombia with different types of management.. Acta Agron. [online]. 2008, vol.57, n.1, pp.31-42. ISSN 0120-2812.

The study carried out in two localities in zones to the north of the department of the Cauca Colombia , random a design of blocks with six treatments was used: 1. bare plots (reference); 2. Rotation crops + organic fertilizer. (Farming); 3. Rotation from improved praire. (Minimum till + chemical fertilizer); 4. Conventional rotation. (Chemical Farming + chemical fertilizer); 5. Rotation crops + legumes. (Chemical Farming + chemical fertilizer); 6. Rotation from improved praire. (Chemical Farming + chemical fertilizer). These treatments established as run-off plots during eight years were exposed without vegetation to the impact of rains during 10 months, which were compared to the reference plots whose original to praire was 15 years old. To evaluate the structural stability the test of turbidimetría was used. The results appeared like the area under the curve (AUC) for the dispersion variable (%), which was lower for the aggregates taken from the surface of virgin soils (Treatment 1) and rotation of crops plus minimum till (Treatment 3). The rotation treatment with addition of organic chicken manure (3 t/ha) and covers of legumes presented the higher values.

Palavras-chave : Turbidimetría; crops rotation; minimum till; aggregate dispersion; legumes; manure.

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