Agricultural savanna sandy loam soil inter-particle coherence. Monagas State, Venezuela

Cohesion and angle of internal friction are of agricultural interest aspects for root growth, soil tenacity, design tools, systems on the soil tractive/traction, erodibility, elasticity, deformation, infiltration, field capacity, design sources of power and self-propelled equipment. It has been conjectured that sandy loam soils have not expandable clays which lacks cohesion. The objective was to assess the soil inter-particle coherence and its relationship with the angle of internal friction, dry density, the normal stress, soil moisture, depth and its effect on the studied soil resistivity. The Triaxial tests were used to measure the physical and terramechanic parameters, and linear regression and statistical analysis for the best subset to interpret the variance between parameters. Among the results yielded a maximum value of the strength of inter-particle coherence or apparent cohesion of 98.05 kPa with a normal stress of 835.58 kPa, an internal friction angle of 31.77 ° and a humidity of 6.12% and 68.31 kPa for an internal friction angle of 33.31 °, a dry density of 1640 kg*m-3 and a humidity of 6.04%. It was concluded that soil moisture was the most influential, inverse exponential relation, on soil cohesion and soil shear stress. In the friable state could produce a range of interparticle attraction between 33.88 and 19.96 kPa suitable for tillage and root development. Compaction had effect on the inter-particle attraction and internal friction did not intervene. The effect of soil cohesion on soil strength seconded to the angle of internal friction, a component of the equation of Coulomb shear strength, was the most influential parameter of resistance. La cohesión y el ángulo de fricción interna son de interés agrícolas en los aspectos del crecimiento radical, tenacidad del suelo, diseño de implementos, sistemas tractivos en la interfaz suelo/tracción, erodibilidad, elasticidad, deformación, infiltración, capacidad de campo, diseño de las fuentes de potencia y equipos autopropulsados. Se ha conjeturado que los suelos francos arenosos por no poseer arcillas expansibles carecen de cohesión. El objetivo consistió en valorar la coherencia interpartículas del suelo y sus relaciones con el ángulo de fricción interna, la densidad seca, la tensión normal, la humedad, la profundidad y su efecto en la resistencia del suelo. Los ensayos triaxiales se utilizaron para determinar los parámetros físicos y terramecánicos; y la regresión lineal y el análisis para el