Australian Journal of Soil Research articles from August 2007

Australian Journal of Soil Research archives from August 2007

Gravity segregation during miscible displacement--re-investigation and re-interpretation.(Report)
August 1, 2007... Introduction When the liquid residing in a horizontal bed of porous material is displaced by another liquid of different density, the resulting hydrodynamic dispersion is modified by the formation of a tongue of denser liquid undershooting...

Labile soil organic matter pools under a mixed grass/lucerne pasture and adjacent native bush in Western Australia.(Report)
August 1, 2007... Introduction Much of the wheat produced in Western Australia (WA) is grown on coarse-textured soils (>90% sand). Typically, it is grown in a 3- or 4-course rotation including a break crop (e.g. canola) and annual/perennial grasses with...

Effects of 15 years of conservation tillage on soil structure and productivity of wheat cultivation in northern China.(Report)
August 1, 2007... Introduction China is one of the world's major dryland farming countries. Rainfed land (crop production without irrigation) is largely located in the 16 provinces of northern China, where 33 Mha of arid and semi-arid land represents 52.5%...

Short-term changes in soil properties under tillage systems and their effect on sweet potato (Ipomea batatas L.) growth and yield in an ultisol in south-eastern Nigeria.(Report)
August 1, 2007... Tillage influences soil quality via its effects on soil physical, chemical, and biological properties, which in turn affect crop productivity. This study evaluates the effects of conventional (CT) and no-till (NT) systems on (1) soil ...

Effects of nitrogen fertiliser and wheat straw application on C[H.sub.4] and [N.sub.2]O emissions from a paddy rice field.(Report)
August 1, 2007... Introduction Both C[H.sub.4] and [N.sub.2]O have been listed as controlled greenhouse gases following C[O.sub.2] in Kyoto Protocol. According to Climate Change 2001, C[H.sub.4] and [N.sub.2]O have 23 and 296 times higher global warming...

Effects of zeolite application on nitrate and ammonium retention of a loamy soil under saturated conditions.(Report)
August 1, 2007... Nitrogen (N) loss from irrigated cropland, especially in rice paddies, results in low N-use efficiency and groundwater contamination. Soil conditions that increase ammonium and nitrate ion retention alleviate these problems. ...

A laboratory and glasshouse evaluation of chicken litter ash, wood ash, and iron smelting slag as liming agents and P fertilisers.(Report)
August 1, 2007... Introduction Soil acidity is a major problem worldwide, as it decreases plant growth by affecting the availability of nutrients and causes various toxicities. Acid soils are commonly deficient in phosphate (P), so that both conditions...

Chemical fractionation of fluorine in soils with a long-term phosphate fertiliser history.(Report)
August 1, 2007... Introduction Large quantities of fluorine (F) are incidentally added to soil from the application of phosphorus (P) fertilisers (1-4% F) (Loganathan et al. 2003). The added F continues to accumulate in the top few centimetres of soils as a...

A comparison of some surface soil phosphorus tests that could be used to assess P export potential.(Short Communication)(Author abstract)(Report)
August 1, 2007... Introduction In many freshwater ecosystems, phosphorus (P) limits primary production. Soil testing has often been used to estimate the risk of P exports associated with agricultural production systems (Sims 1993, 1998; Sims et al. 2000;...