|
|
|
|
|
Moraes,Moacir T. de; Debiasi,Henrique; Franchini,Julio C.; Silva,Vanderlei R. da. |
Soil compaction caused by machinery traffic reduces crop yields. This study aimed to evaluate the effects of intensive traffic, and the soil water content, on the soil penetration resistance (PR) of a Rhodic Eutrudox (Distroferric Red Latosol, Brazilian Classification), managed under no-tillage (NT). The experiment consisted of six treatments: NT with recent chiseling, NT without additional compaction, and NT with additional compaction by 4, 8, 10 and 20 passes of a harvester with a weight of 100 kN (70 kN on the front axle). Undisturbed soil samples were collected at 5.5-10.5 cm and 13.5-18.5 cm depth to quantify the soil bulk density (BD). The PR was assessed in four periods, using an impact penetrometer, inserted in the soil to a depth of 46 cm. The... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil layers with mechanical impedance; No-tillage; Soil compaction; Soil consistency; Soil profile. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400014 |
| |
|
|
Lima,Herdjania Veras de; Silva,Álvaro Pires da; Giarola,Neyde Fabíola Balarezzo; Imhoff,Sílvia. |
Many soils have a hard-setting behavior, also known as cohesive or "coesos". In such soils, the penetration resistance increases markedly when dry and decreases considerably when moist, creating serious limitations for plant emergence and growth. To evaluate the level of structure degradation in hard-setting soils with different texture classes and to create an index for assessing soil hardness levels in hard-setting soils, six soil representative profiles were selected in the field in various regions of Brazil. The following indices were tested: S, which measures soil physical quality, and H , which analyzes the degree of hardness and the effective stress in the soil during drying. Both indices were calculated using previously described functions based on... |
Tipo: Info:eu-repo/semantics/other |
Palavras-chave: S index; Coastal tablelands; Soil consistency; Hardened horizons. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000600007 |
| |
|
|
|