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soil aggregate

Catalogue: GRDC Publications
Soil organic matter contributes to a range of biological, chemical and physical properties of soil and is essential for soil health... Soils rarely reach their theoretical potential for organic matter storage (see Figure 1.7)... In soils with low clay content the amount of humus and resistant soil organic matter is increasingly important to nutrient exchange because its large surface area gathers (adsorbs) cations from the soil solution, holding nutrients that would otherwise leach...
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Catalogue: GRDC Publications
Overall, soil CEC and SOC content was greatest in the 0.2 and 0.2-2 m fraction, indicating that size, and probably type, of SOM influenced CEC... Kaiser et al. (2003) found that soils with a high content of black carbon showed increased sorption ability compared with plant- and microbial-derived SOM... Addition of organic amendments can increase P availability to plants by decreasing the P adsorption capacity of soils...
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Catalogue: GRDC Updates
The objective of the paper is to examine the relative contribution of soil biological attributes, including organic carbon to crop production using Western Australian (WA) farming systems as an example... Identifying Soil Constraints to Crop Production Environmental indicators are measures of physical, chemical, biological or socio-economic characteristics which reflect changes in processes, properties or function - with different attributes required for different land uses... In the trial, the microbial biomass (measured to 30 cm depth) contained the equivalent of 192 kg/ha urea (stubble retained) and 146 kg/ha urea (stubble burnt) - a significant source of potentially plant available N. These results illustrate that regular inputs of organic residues promote both a larger but also more active microbial community...
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Catalogue: GRDC Final Reports
Improving compacted soils in the eastern wheatbelt.. The pore spaces between soil aggregates are enlarged and can hold and conduct more water increasing the ability of the soil to store and supply water... A combination of deeper ripping and closer tine spacing can give larger yield increases...
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