Australian Journal of Soil Research articles from March 2001

Australian Journal of Soil Research archives from March 2001

Shallow groundwater dynamics in smectite dominated clay on the Liverpool Plains of New South Wales.
March 1, 2001... Introduction The risk of dryland salinity development on the Liverpool Plains in northern New South Wales was first appreciated when it was realised that shallow groundwater ([is less than] 5 m depth) existed over much of the Plains, and...

A comparison using the caesium-137 technique of the relative importance of cultivation and overland flow on soil erosion in a steep semi-tropical sub-catchment.
March 1, 2001... Introduction Soil erosion is a major environmental concern in agricultural practice, especially on steeply sloping land. In addition to erosion by rainfall and overland flow it is increasingly being recognised that cultivation itself can...

Traffic and residue cover effects on infiltration.
March 1, 2001... Introduction In dryland crop production with highly variable, summer-dominant rainfall, crop yield depends on soil water stored during fallow (Freebairn et al. 1986a), so reduced infiltration can limit yield. Runoff associated with low...

Tillage and traffic effects on runoff.
March 1, 2001... Introduction The climate of the northern Australian cropping zone is characterised by evaporation rates 2-3 times greater than the annual rainfall, a significant proportion of which occurs in storms of great intensity (Pierrehumbert 1977)....

Spatial prediction of topsoil salinity in the Chelif Valley, Algeria, using local ordinary kriging with local variograms versus whole-area variogram.
March 1, 2001... Introduction The widespread and growing phenomenon of salinisation in Mediterranean areas is related largely to climatic factors and irrigation development (Isbell et al. 1983; Puigdefabregas and Mendizabal 1998). The problem is acute in...

Land suitability assessment in the Namoi Valley of Australia, using a continuous model.
March 1, 2001... Introduction Land evaluation is the process of assessing the possible uses of land for agriculture, engineering, forestry, recreation, industry, conservation, and so on. In a farming context, it is the assessment for a specified kind of...

Soil degradation under cropping and its influence on wheat yield on a weakly structured New Zealand silt loam.(Statistical Data Included)
March 1, 2001... Introduction Mixed cropping (i.e. grazed ryegrass/white clover pastures grown in rotation with arable crops) is a major land use on the Canterbury Plains of New Zealand. Traditionally, the pastoral and arable phases were of similar length...

Effects of management practice on properties of a Victorian red-brown earth. 2(*). Wheat root distribution and grain yield.(Statistical Data Included)
March 1, 2001... Introduction The present average wheat yield in Victoria is approximately double that of the early 1860s (Williams and Raupach 1983). This is much lower than would be expected, given the major advances that have taken place in farm...

Rotation crops for irrigated cotton in a medium-fine, self-mulching, grey Vertosol.(Statistical Data Included)
March 1, 2001... Introduction Sustainability in any farming system depends upon a number of interacting factors including climate, soil quality, plant nutrition, management, and weed and disease incidence, as well as economic factors (Greenland and...

Nitrate accumulation under cropping in the Ferrosols of Far North Queensland wet tropics.(Statistical Data Included)
March 1, 2001... Introduction Recent fertiliser N mass-balance studies for the major cropping systems (sugarcane, banana, and pasture) in the wet-tropical Johnstone River Catchment (JRC) of Far North Queensland (FNQ) showed that 30-50% of the fertiliser N...

Changes in chemical nature of soil organic carbon in Vertisols under wheat in south-eastern Queensland.
March 1, 2001... Introduction Cultivation and crop production can have profound effects on the C levels of soils. Prolonged cultivation invariably leads to a decline in C and N levels in soil, particularly when virgin land is first brought under...

Carbon and nitrogen mineralisation in sand, silt, and clay fractions of soils under maize and pasture.(Statistical Data Included)
March 1, 2001... Introduction Soil organic carbon (C) and nitrogen (N) are key indicators of soil quality (Doran et al. 1994), and long-term ecosystem sustainability is influenced by the C and N status of soils. Soil is also an important global reservoir...

Variability of [[Delta].sup.15]N in soil and plants at a New Zealand hill country site: correlations with soil chemistry and nutrient inputs.
March 1, 2001... Introduction Since human contact around 2000 years ago (Holdaway 1996), a series of environmental disturbances derived from human activity and natural events have occurred in New Zealand. Natural events include a devastating volcanic...

Nitrogen leaching from soil lysimeters irrigated with dairy shed effluent and having managed drainage.
March 1, 2001... Introduction In Australasia, dairy farms produce considerable volumes of effluent following the cleaning of milking sheds after each milking. The effluent is a dilute organic waste containing faeces and urine, which is washed into a...

Beneficiation of apatite rock phosphates by calcination: effects on chemical properties and fertiliser effectiveness.
March 1, 2001... Introduction Most rock phosphates (RPs) are apatite-bearing rocks that contain enough phosphorus (P) to be utilised for the manufacture of fertilisers, elemental P, and/or phosphoric acid (Gary et al. 1974). Some RPs are calcined during...

Phosphorus sorption and desorption in oxide-rich Ferralsols of New Caledonia.
March 1, 2001... Introduction In the warm humid tropics, alteration of parent materials has generally led to the formation of Ferralsols, which are characterised by the presence of 1:1 clay minerals and aluminium (Al) and iron (Fe) oxides. The high...

The orthophosphate content of bicarbonate soil extracts.
March 1, 2001... Introduction Phosphorus (P) is an essential macronutrient for plants, and is mainly derived from the soil solution as orthophosphate (Wild and Jones 1988). Numerous tests have been developed to estimate the capacity of the soil to provide...

Charge properties of red Argentine soils as an indicator of iron oxide/clay associations.
March 1, 2001... Introduction Soils are a very complex mixture of clay minerals, oxides, and organic matter, with the concurrent existence of adsorption of organic matter and oxides on clay minerals. In the north-east area of Argentina, weathering of...