Resumo

PICCIN, Marcieli; AMADO, Telmo J. C.  e  FIORIN, Jackson E.. Management strategies to deep rooting layer improvement of an Oxisol. Rev. de Ciências Agrárias [online]. 2020, vol.43, n.2, pp.48-66.  Epub 22-Abr-2020. ISSN 0871-018X.  https://doi.org/10.19084/rca.19242.

The long term use of the no-tillage system has caused limitations to the soil, such as the subsurface compaction and acidity. The aim of this study was to evaluate the effect of management strategies on soil attributes and soybean yield. The experiment was carried out in the 2016/17 and 2017/18 crop seasons and its experimental design was a randomized blocks with three replications. The treatments were constituted by strategies of physical improvement (chiseling and subsoiling) and chemical improvement (calcium and magnesium oxide, limestone and gypsum), isolated or combinated. Soil samplings for chemical analysis and determination of resistance to soil penetration were performed 6 and 18 months after application of treatments. The chiseling and subsoiling were efficient in reduction compaction, but presented temporary effects in the soil. The intense subsoiling associated with the deep application of calcium and magnesium oxide, 18 months after the application, increased the pH values and the calcium and magnesium contents in addition to neutralizing the aluminum saturation to the depth of 60 cm. In both evaluated seasons, there was no significant effect of treatments on soybean productivity.

Palavras-chave : No-tillage system; penetration resistance; subsurface acidity.

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