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organic amendment

Catalogue: GRDC Final Reports
Subsequently a key extension publication was developed that outlines the considerations required prior to the use of animal manures and organic wastes in grain cropping systems... The research highlights that a large volume of available data exists on the use of manures and organic amendments in cropping systems... Higher rainfall cropping zones (more than 600 mm/year) have the greatest capacity to store soil carbon (18 tonnes per hectare compared with 2.5 tonnes per hectare for rainfall less than 600 mm/yr) and are more likely to positively respond to organic inputs...
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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 Final Reports
Chemical forms of organic P have been partially characterised in these soils... A future project using the data generated from UA00062 and using outputs from other GRDC research projects on C and N decomposition could be aimed at the construction of a combined C:N:P organic matter mineralisation model relevant to farming systems on southern Australian soils that will underpin the development of a P fertiliser decision tool... Biochemical composition (e.g. lignin content, total and water soluble P, C and N) for a number of different plant residues were measured and related to release of plant-available P as well as changes in organic P (labile, microbial and stable) pools...
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