Resumo

CASTIGLIONI, Mario Guillermo  e  BIANCO, Trinidad Reddel. Temporal and spatial variation of penetration resistence in a plot under no tillage. Cienc. suelo [online]. 2021, vol.39, n.1, pp.12-19. ISSN 1850-2067.

Soil compaction represents a productive and environmental problem. This process can vary in intensity according to soil depth, soil landscape position and management practices. The objective of the present work was to study, during a soybean-wheat/soybean crop sequence under no tillage, the temporal and spatial penetration resistence (RP) variation, in a plot with ondulate relief located in the north of Bs. As. We worked on an Argiudol in an ondulate plot with the presence of eroded soils and with more than twenty years under no tillage. The RP and gravimetric soil water content was measured every 5 cm of depth and up to 20 cm, in three landscape positions and at five moments during a year. In order to compare the RP results between dates and landscape positions, the results of this variable were corrected to the same soil water content reference value (RPcorr). The results showed that even with soil moisture content close to field capacity, soils would present restrictions to root growth from 10-15 cm deep. The temporal variations of RPcorr depended on the soil position in the landscape. These changes did not result from the effect of agricultural machinery traffic. Soil erosion did not affect the RPcorr results, being the footslope the landscape position that generally presented higher values in this property.

Palavras-chave : landscape position; erosion; management practices.

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