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soil colour

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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
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: Ground Cover
The authors endorse the recommendations of an earlier GRDC advice sheet, "Reducing economic losses from frost", produced in 2000... The leader of a major GRDC frost project based in the Climate Risk Management Unit at the South Australian Research and Development Institute (SARDI), Melissa Rebbeck, says that while trials need to be repeated to gain more statistical significance, preliminary results are interesting... Ms Rebbeck says the drought year of 2002 knocked out the trials, and the dryer conditions of 2004 made it difficult to discern some data, but in 2003, the researchers found that clayed soil can raise the temperature of the wheat canopy by 2 C compared to wheat canopies on adjacent unclayed sites...
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Catalogue: GRDC Updates (West)
KNIFE POINTS KNIFE POINTS.. Fine repellent dry soil 'boils' up in front of the almost vertical point face and runs behind the point into the seed slot.. The small wings behind the point push up the soil beside the point and increase the slope...
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