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soil carbon stock

Catalogue: GRDC Media
Dr Baldock said practices to increase soil carbon included: enhancing the proportion of perennial vegetation in pastures or conversion of paddocks or portions of paddocks that continually give negative returns to perennial vegetation; increasing the retention of crop residues, reduced stocking rates and increased use of green manure crops to return more plant material and biologically fixed nitrogen to the soil; and optimising farm management inputs and other management practices to maximise water use efficiency and maximise the addition of crop/pasture derived carbon to the soil... "There is no doubt that soils could potentially hold more carbon," he said... "To gain a true appreciation of the potential economic gains associated with a soil carbon increase, the affect on soil productivity and subsequent product yields should be incorporated into the economic analysis," he said...
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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
Soil organic carbon makes up about 58 per cent of the mass of organic matter and is usually reported in a soil analysis report as the concentration (i.e. per cent) of organic carbon in soil (see Chapter 1 for more detail)... If a soil has a significant amount of gravel or stone material, this fraction is removed before analysis with the final soil carbon or nutrient assessment being only representative of the mineral component of the remaining soil... Understanding how organic matter cycles through the soil and what drives its accumulation and loss is critical to maintaining it at optimal levels within agricultural systems...
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Catalogue: GRDC Updates
As an example, where appropriate use of fertilisers can increase productivity beyond that currently being attained, adjusting the amount or timing of fertiliser application would result in greater carbon inputs to the soil... Recent research results have also noted that the proportion of residue carbon that is retained in a soil to enhance soil carbon stocks can be enhanced by ensuring that enough nutrients exist in the soil to both satisfy the crop requirements and the requirements to build soil organic carbon... If we use the same bulk density as above (1.2 g/cm3) and restrict our calculations to the top 10 cm of soil where organic carbon is most easily increased, at 2% carbon the soil would contain 24 tonnes C/ha...
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