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Catalogue: GRDC Publications
In summary, 20 trials have now recently been undertaken across a number of seasons and locations in NSW. None of them have demonstrated S responses in yield or oil %. This does not exclude deficiency and yield penalties from occurring but does highlight that the frequency and the likelihood is not high... In summary, using Yield Prophet as a way of increasing soil water knowledge is more difficult to trial than probes... In summary, the growth in the use of probes to understand soil water is easily explained using the framework above...
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Catalogue: GRDC Publications
In summary, 20 trials have now recently been undertaken across a number of seasons and locations in NSW. None of them have demonstrated S responses in yield or oil %. This does not exclude deficiency and yield penalties from occurring but does highlight that the frequency and the likelihood is not high... In summary, using Yield Prophet as a way of increasing soil water knowledge is more difficult to trial than probes... In summary, the growth in the use of probes to understand soil water is easily explained using the framework above...
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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
Increasing organic matter (and organic carbon) in soil requires a balance of carbon and nitrogen as well as other nutrients... 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 Publications
Soil microrganisms also impact on the physical properties of soils including their capacity to hold water... An on-going output will be the coordination of review workshops and reporting processes to ensure that adequate resourcing, integration and consistency measures are being applied across all projects and new opportunities are identified... The major foci of this project are to screen and identify elite diseasesuppressive microbes for cereals and nodulation enhancing beneficial microbes for legumes...
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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 Research Summaries
Recent work has shown nitrate adsorption to anion exchange sites slows nitrate leaching in soils with pH dependent positive charge... To achieve the objective, soil from long-term field trials will be analysed for carbon (C), nitrogen (N) and phosphorus (P) in measureable fractions and information obtained will be used to test model predictions using crop N & P uptake plus yield collected in long-term trials... The project output will include a revised soil module in the crop systems model, APSIM, based on measureable fractions of organic matter and knowledge of ratios of carbon (C), nitrogen (N) and phosphorus (P) in these fractions...
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Catalogue: GRDC Updates
Previous trials and demonstrations funded through the Department of Environment Water and Natural Resources (DEWNR) and Caring for Our Country have shown large increases in production are possible results have been variable and somewhat unpredictable. '.. The document provides a summary of areas of potential opportunity and also a brief description of the most likely and most beneficial outcomes... While a review of claying trials in South Australia showed an average yield increase of 70 per cent, individual results ranged from 0 to 100 per cent...
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Catalogue: GRDC Factsheets
Nitrogen is vital to crop growth but it is mostly present in soil in an organic form that plants cannot take up... Organic nitrogen typically accounts for more than 90 per cent of all nitrogen in soil but usually is not directly available to plants... The ratio of carbon to nitrogen in residues is a deciding factor whether nitrogen is removed or released in the soil...
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