Item request has been placed! ×
Item request cannot be made. ×
loading  Processing Request

Structural properties of the soil seedbed submitted to mechanical and biological chiseling under no-tillage

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
  • معلومة اضافية
    • Contributors:
      Guedes Filho, O.; da Silva, A.P.; Giarola, N.F.B.; Tormena, C.A.
    • Publication Information:
      Elsevier B.V., 2013.
    • Publication Date:
    • Subject Terms:
    • Abstract:
      Tensile strength and aggregate stability are two of the most important structural properties that may affect the physical environment of the soil seedbed for germination and initial plant development. The objective of this study was to determine the tensile strength, friability, and aggregate stability of the seedbed of an Oxisol after a long-term no-tillage. The experiment was carried out in Ponta Grossa, Paraná State, Brazil, at the farm belonging to Ponta Grossa State University. The treatments were no-tillage for 18years, no-tillage submitted to mechanical chiseling at 0.25m soil depth and no-tillage submitted to biological chiseling by a forage radish crop. The experimental design was in randomized blocks with four replications, resulting in 12 plots. Soil samples were collected at six and 18months after the treatments were applied, corresponding to a maize seedbed (October 2009) and soybean seedbed (November 2010), for the 0 to 5 and 5 to 10cm soil depths. Tensile strength was determined in 2400 aggregates with a diameter of 2 to 4mm using the indirect tension test through an electronically controlled loading frame with a displacement speed of 0.03mms⁻¹. Aggregate stability was determined by the water percolation method in acrylic columns filled with aggregates of 1 to 2mm diameter. The data were submitted to the variance analysis and, when significant, the means were compared by the Tukey test (p
    • File Description:
    • ISSN:
    • Accession Number:
    • Accession Number: