Measurements of soil penetration resistance (SR) have been frequently used for the evaluation of soil structural quality for plant growth. However, different data analysis approaches have been used, without a previous evaluation of their statistical quality. In this study we tested the hypothesis that the mean is the parameter with best statistical properties to evaluate alterations in soil pen...

Lincomycin is commonly used on swine farms for growth promotion as well as disease treatment and control. Consequently, lincomycin may accumulate in the environment adjacent to the swine farms in many ways, thereby influencing antibiotic resistance in the environment. Levels of lincomycin-resistance genes and lincomycin residues in water and soil samples collected from multiple sites near waste...

Overtopping, internal erosion, and piping are the main causes of accidents and failures of embankments for dams, lagoons, and levees. A key parameter in the failure of these structures is the erodibility of the soil materials used in construction of the embankments. The soil materials are typically constructed based on compaction specifications. The jet erosion test (JET) has been developed to ...

Since its introduction in 1940, the plaster of Paris block method of measuring soil moisture by means of electrical resistance (4) has been widely employed in agricultural fields. Hydrologic research2 (16), war production problems involving guayule culture (11, 12), and many other investigations ranging from field irrigation to greenhouse studies have made use of this technique. Briefly, the me...

A field pile loading test was carried out on the Peshawar–Karachi Motorway (PKM) project in Pakistan to show settling mechanism of bored foundation pulverized soil and force characteristics frictional resistance at pile-soil interface. The changes lateral settlement during loading-unloading process piles were measured analyzed, as well load-settlement distribution different layers, internal for...

Due to the lack of good quality water for human consumption and industry, in many countries irrigated agriculture is exposed to increasing pressure to expand the use of brackish and even high-saline waters for crop production. The application of lower quality waters requires special management practices, which are not yet fully understood with respect to optimization of plant growth on saline s...

This paper presents the effect of geogrid tensile strength by calculating pullout resistance and geogrid-soil interaction mechanism. In order to investigate this interface, a series of pullout tests have been conducted by large scale reformed direct shear test apparatus in both cohesive and granular soils. In numerical, finite difference software FLAC3D has been carried out on experimental test...

Measurements of rhizosphere carbon efflux are critical to the determination of soil carbon balance by CO2 flux measurements. We attempted to measure rhizosphere respiration in a forest ecosystem by transplanting 13Cenriched soils from a tallgrass prairie into a mixed-conifer forest soil but found that atmospheric air mixing and lateral diffusion confounded δC-CO2 measurements. Surface CO2 efflu...

Due to the complexity of pile–soil interaction, there is little research on active–passive piles that bear pile-top load transmitted from superstructure and pile shaft caused by lateral soil movement around simultaneously. The purpose this study analyze displacement internal force piles. Most design codes in China use elastic resistance method describe relationship between horizontal pile, but ...