Alteração de atributos fisicos de um solo, sob pastagem degradada, submetido a escarificação / Physical attributes changes on a soil, under degraded pasture, submitted to scarification

AUTOR(ES)

Marcelo Jose Colet

DATA DE PUBLICAÇÃO

2006

RESUMO

The intensive use of the soil combined with inadequate management practices leads to soil degradation. This problem is common with pasturelands, where the farm manager specializes in animal husbandry, and not in soil management. Soil compaction in such areas can be considered as one of the main limitations to forage production capability. Several techniques may be applied to break through compacted soil layers, and scarification is one of them. The objective of this study is to evaluate the changes to soil physical properties in pasture areas after scarification, aiming at the recovery of degraded pasturelands. The experiment was set up at the Zootechny Institute in Nova Odessa (SP) on a Brachiaria decumbens field. The machine used in the study was a prototype developed at Feagri/Unicamp for simultaneous soil scarification and fertilizer distribution. The effect of scarification on the soil was evaluated by soil resistance to penetration with an electronic hydraulic penetrographer, and by the physical attributes of macroporosity, microporosity, total porosity and soil density 60 days after setup. Scarification increased soil macro and total porosity, and reduced soil density on the top 100 mm, observed between scarification rows. Macroporosity, microporosity and soil density was not affected in the depth of 100-200 mm. Scarification caused a slight compaction immediately below the work-depth, made evident by the higher macroporosity in this section of the soil. The methodology of analyzing the area below the resistance curve allowed the statistical comparison of soil resistance to penetration. This methodology showed that scarification caused statistically significant reduction of the figures on soil resistance to penetration

ASSUNTO(S)

solos - porosidade bulk density solos - manejo soil degradation soil porosity soil penetration resistance teste de penetração do solo solos - compactação soil compaction solos - degradação solos - densidade soil management

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