Australian Journal of Soil Research articles from March 1999

Australian Journal of Soil Research archives from March 1999

Urban soil contamination in Bangkok: concentrations and patterns of polychlorinated biphenyls (PCBs) in topsoils.
March 1, 1999... Abstract Little is known about the polychlorinated biphenyl (PCB) pollution of tropical environments, although part of the contribution to global PCB contamination originates in the tropics. The objective of this study was to compare PCB...

Comparison of peroxide-oxidisable sulfur and chromium-reducible sulfur methods for determination of reduced inorganic sulfur in soil.
March 1, 1999... Abstract The rational management of acid sulfate soils requires analytical methods that provide reliable and accurate data on the content of reduced inorganic sulfur; it is this fraction that produces acid during oxidation. This study...

Use of on-ground gamma-ray spectrometry to measure plant-available potassium and other topsoil attributes.
March 1, 1999... Abstract The incidence of potassium (K) deficiency is increasing in crops, pastures, and forestry in south-western Australia. Although soil K can be measured using soil sampling and analysis, [Gamma]-ray spectrometry offers a potentially...

Using active fractions of soil organic matter as indicators of the sustainability of Ferrosol farming systems.
March 1, 1999... Abstract Chemical and physical degradation of Red Ferrosols in eastern Australia is a major issue necessitating the development of more sustainable cropping systems. This paper derives critical concentrations of the active...

Dispersed clay and organic matter in soil: their nature and associations.
March 1, 1999... Abstract Clay dispersion in soil results in structural instability and management problems. The aim of this study was to determine whether or not the easily dispersed colloidal materials differ in their properties from colloidal materials...

Kinetics of nonexchangeable potassium release from a Tropaquept as influenced by long-term cropping, fertilisation, and manuring.
March 1, 1999... Abstract We studied the effect of long-term cropping, fertilisation, and manuring on kinetics of nonexchangeable potassium (K) release from a Tropaquept in 0.01 M Ca[Cl.sub.2] and 0.01 M citric acid media under a rice-rice cropping system...

The influence of the soil matrix on nitrogen mineralisation and nitrification. IV. Texture.
March 1, 1999... Abstract Small undisturbed soil volumes (c. 1.7 [cm.sup.3]) were collected from the surface of a small field plot. Soil volumes were treated with clover-derived substrate, dried and rewetted, or retained continuously moist from the field....

The influence of the soil matrix on nitrogen mineralisation and nitrification V. Microporosity and manganese.
March 1, 1999... Abstract Small soil cubes of dimensions 12 by 12 by 12 mm were collected from the surface of a red earth. Treatments were addition of clover substrate or urea, drying and rewetting, or no amendment, after which soils were incubated at...

A lysimeter study of the impact of cow urine, dairy shed effluent, and nitrogen fertiliser on nitrate leaching.
March 1, 1999... Abstract The effect of cow urine, dairy shed effluent (DE), and urea fertiliser on nitrate leaching was determined using undisturbed soil lysimeters (500 mm diameter by 700 mm deep) with ryegrass (Lolium perenne)--white clover (Trifolium...

Losses of nitrogen from an effluent-irrigated plantation.
March 1, 1999... Abstract Effluent-irrigated tree plantations are becoming a popular alternative to the direct discharge of sewerage effluent into inland rivers. However, when irrigated at the water-use rate of the plantation, nitrogen (N) applied in the...

Hydraulic conductivity in soils irrigated with wastewaters of differing strengths: Field and laboratory studies.
March 1, 1999... Abstract Application of wastewater can decrease the hydraulic conductivity of soils, and so reduce future loading rates. A possible mechanism for this decrease is blockage of soil pores by microbial growth and extracellular carbohydrate...