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Acta Scientiarum. Agronomy

versão impressa ISSN 1679-9275versão On-line ISSN 1807-8621

Resumo

FLAVIO NETO, José et al. Biological soil loosening by grasses from genus Brachiaria in crop-livestock integration. Acta Sci., Agron. [online]. 2015, vol.37, n.3, pp.375-383. ISSN 1807-8621.  https://doi.org/10.4025/actasciagron.v37i3.19392.

Soil compaction associated with pastures degradation can decrease animal productivity, forage longevity and compromise environmental sustainability. To confront this serious issue, the loosening potential of forages should be recognized. We evaluated the least limiting water range as indicator of biological loosening potential in relation to cultivation of grasses the genus Brachiariain crop-livestock integration. We also evaluated the water availability to soybean crop that succeeded these grasses. Our studies were performed in two stages. In the first stage, we divided 32 plots into four randomized blocks in which we cultivated corn combined with following treatments: 1 - Brachiaria brizanthacultivar Marandu; 2 - Xaraes; 3 - Piata; 4 - MG4; 5 - B. decumbens; 6 - B. ruziziensis; 7 - Invasive plants; and 8 - uncovered soil. We evaluated soil, to quantify the biological soil loosening, and also forages. In the second stage, we cultivated soybean and added: 9 - conventional tillage as a control treatment, increasing number of plots to 36. Our results suggest that it is possible to cultivate Brachiaria brizantha or Brachiaria decumbens as management strategy to aid edaphic recovery. Xaraes and Piata grasses provide greater soil loosening while increasing water availability to successive soybean crop.

Palavras-chave : pasture recovery; soil structural quality; least limiting water range.

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