Resumo

MADERO-MORALES, Edgar; PENA-ARTUNDUAGA, María Elvira; ESCOBAR, Betsy Yadira  e  GARCIA, Luís Fernando. Potential compaction in two soils of the flat portion of Valle del Cauca. Acta Agron. [online]. 2012, vol.61, n.1, pp.27-31. ISSN 0120-2812.

Samples from the top 20 cm of two soils in CIAT Palmira (Calciustoll and Haplustoll both vertic mixed loamy isohipertermic 0.5% slope) used in both secondary forest cover and diverse crops for more than fifty consecutive years were compacted into the apparatus of Richards at two soil moisture contents (0.1 and 0.5 bar) to compare the point of maximum soil compaction and its influence in the soil bulk density changes, rate of oxygen diffusion, aeration porosity, saturated hydraulic conductivity and rupture modulus. A complete randomized design with factorial arrangement was used which consisted of 2 soils x 2 uses x 2 soil moisture content x 3 repetitions and means separated by Duncan probe. The study showed that high soil content of O.M. do not always prevent soil degradation due to of agricultural machinery traffic at high soil moisture contents. Irrespective of soil use, siltier Calciustoll had a slightly more potential to compaction than Haplustol, and continued cultivation of the two soils has made them more susceptible to physical damage, because in wet condition compacted to the extreme and showing physical degradation which in practice may result from traffic on soils, and in moist state, compacted moderately.

Palavras-chave : Potential soil compaction; Richards's compactor; soil management.

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