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agricultural soil

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Catalogue: GRDC Research Summaries
" DGT as the soil test of choice for predicting phosphorus requirements of grain crops.. Work funded previously by GRDC has shown that a new soil test sensor, known as Diffusive Gradients in Thin Films (DGT) provides an accurate measure of soil phosphorus available to wheat... The network of collaborators established in previous projects will be used to ensure as many regions and trials are accessed as possible - both current and archived soil samples will be analysed using DGT as well as the traditional Colwell, the resin test used by researchers and the Colwell plus PBI modification...
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Catalogue: Ground Cover
Danny Flanery's focus on soil health has resulted in canola yields increasing from just 50t when he was starting out to around 500t from the same area (2500ha) now... Danny could not afford the fencing or trees on the scale required to make an effective start on the remediation of his own property, but local Landcare coordinator Louise Hufton of the Murrumbidgee Catchment Management Authority (CMA) was able to set some wheels in motion to secure government assistance... Danny has planted trees across a total of 300ha, and he sees this as a way to reinvigorate the property's biodiversity, while providing shelter for stock, pasture and crops, and absorbing excess moisture in the gullies...
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Catalogue: GRDC Final Reports
Further field validation of DGT has been successful across a range of seasons - 2007 to 2011 - encompassing a wide range of soil types, highlighting the potential for improved decision-making based on DGT and significant economic benefits... Work during the project extension has enabled assessment of potassium (K) and sulphur (S) in a range of agricultural soils using DGT methodology... Current soil P testing (Colwell P with Phosphorus Buffering Index (PBI)) techniques can provide inaccurate estimates of plant available P. This is not solely limited to soils with high amounts of calcium carbonate but applies to many soils...
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Catalogue: Ground Cover
The CSIRO has discovered an Australian strain of a "mineral-eating" fungus that promises to release nutrients from soil minerals and boost crop yields... The strains that have now been discovered can release nutrients from soil minerals... To date, the major limitation has been the identification and development of strains of Penicillium suited to local soils and environmental conditions...
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Catalogue: GRDC Updates (West)
Dr Edmeades commenced his science career in 1977 at the Ministry of Agriculture and Food in Ruakura NZ, initially his research interests were on soil acidity and liming... After 20 years in his role as a soil scientist at Ruakura, Doug left institutional science in 1997 and established his own science consulting business, which has evolved into agKnowledge... This project investigated the role of surface drainage in controlling waterlogging on shallow sandplain soils and the adaptation of species and varieties of cereals and broad-leaved plants to waterlogging...
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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: 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 (West)
The aim of the following study was to acquire a unique, long-term (> 1 year) data set of N 2O emissions from a rainfed, cropped soil in a semi arid region and to investigate the relationship between N 2O emissions and other soil and environmental parameters... Some ability to make in-season tactical decisions when to graze or continue through to harvest would be valuable... The commodity prices are an important aspect of any decision to graze a cereal crop...
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Catalogue: GRDC Updates (West)
Mention of a trade name or company in this publication does not imply endorsement of any product or company by the Department of Agriculture... I was educated by a group of farmers at Varley in 1982, to the importance of Crop Updates is a partnership between the Department of Agriculture, Western Australia and the Grains Research & Development Corporation 22.. Advisers and consultants should highlight the management options available to their clients, do sensitivity analyses which in effect, tell the client 'what happens to production, quality and profitability, if he chooses a certain management option ' and show how that changes with input levels, season, soil type, prices going up/down, etc...
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