one and two dimensional contaminant transport by pure diffusion through single layer of fine grained soil was investigated using one and two dimensional laboratory models. these models simulates a simple hydrogeologic situation underneath a solid waste landfill comprising a fine grained soil overlying a bed rock. sodium chloride solution was sued as a contaminant source above a compacted clayey...

The extent of contamination of soils with soil transmitted helminthes (STH) eggs, particularly Toxocara, was determined in selected urban and rural towns of Laguna, Philippines. Soil samples were collected from public schools, house yards, and empty lots. Results revealed that, of the 1480 soil samples collected, 460 (31%) were positive for STH eggs. Toxocara sp. was the most prevalent (77%), f...

This paper presents the application of a frequency-domain reflectometry (FDR) sensor designed for soil salinity assessment of sandy mineral soils in a wide range of soil moisture and bulk electrical conductivity, through the determination of soil complex dielectric permittivity spectra in the frequency range 10-500 MHz. The real part of dielectric permittivity was assessed from the 380-440 MHz,...

We studied the effects of Fusarium oxysporum f.sp. strigae (Fos), a soil-borne biocontrol agent (BCA) against Striga hermonthica, on total fungal and arbuscular mycorrhizal fungal (AMF) taxa in rhizospheres of maize in both clayey and sandy soil. Effects of Fos-BCA 'Foxy-2' were evaluated against (1) S. hermonthica presence, and (2) organic fertilization with Tithonia diversifolia residues at 1...

Two soils spiked with lead at different rates were stabilised/solidified using Portland cement and fly ash at different soil:binder ratios and tested for their setting time, unconfined compressive strength (UCS), leachability and durability. Results show that soil texture, percentage of binders and lead concentration play an important part in the treatment, significantly influencing the perform...

The experiment was laid down on October 3rd, 1932, at Hazara Estate, Kearsney, the property of The .pH gives an idea of the "force" .of .the free acids in the soil, but one can easily understand that two different soils, with different physica-l properties but the same degree of acidity in terms of pH, will not react in the same manner to identical lime treatment; for example, sandy soils poor ...

Soils of the Solonetzic Order account for about 7% of the agricultural land in Western Canada. They are most common in semi-arid regions (the Brown and Dark Brown soil zones) but occur as well in the Aspen Parkland and even under forest. They occur on parent materials containing sodium salts, or in lowland areas influenced by ground water discharge. Solonetzic soils are often referred to as cla...

expansive soils may cause disaster if not adequately taken care of. lime continues to be commonly used for modification of these types of soils although it may have limited success in some applications. thus, the present study was performed to address the viability of using silica fume (sf) as industrial waste to modify the behavior of expansive soils. this achieves the double objectives of ove...