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deep soil

Catalogue: GRDC Updates (West)
The relative effectiveness was calculated at the effectiveness of N at a depth compared with the effectiveness of N in the top-soil (0-0.2 m layer)... (A assuming Bulk density of 1.5), B % of sites measured to that depth not of the 474 cores).. The trials necessarily included whatever deep soil N the crops could access and so the responses will be weighted by that contribution from deep N. For tools such as Yield Prophet , the N at depth is usually measured and included in the model the roots for most of the soils in Yield Prophet are set to unconstrained growth...
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Catalogue: GRDC Media
There are few positives to come out of back-to-back dry seasons - such as that experienced by South Australia's south east - but growers can use the experience to dig deep below the soil surface to understand what is contributing to crops not fulfilling their yield potential... Dr Melissa Fraser, a soil consultant with the Rural Solutions SA division of Primary Industries and Regions SA (PIRSA), says a lot of soils in south east SA have a physical or chemical impediment that restricts root growth to the top 10cm of the soil, hindering the plants ability to access moisture and nutrients stored deeper in the profile... Dr Fraser is encouraging growers in the south east to dig holes over summer and do some deep soil testing to get a basic understanding of the make-up of the subsoil and to understand what might be holding back yield potential...
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Catalogue: GRDC Media
There are few positives to come out of back-to-back dry seasons - such as that experienced by South Australia's south east - but growers can use the experience to dig deep below the soil surface to understand what is contributing to crops not fulfilling their yield potential... Dr Melissa Fraser, a soil consultant with the Rural Solutions SA division of Primary Industries and Regions SA (PIRSA), says a lot of soils in south east SA have a physical or chemical impediment that restricts root growth to the top 10cm of the soil, hindering the plants ability to access moisture and nutrients stored deeper in the profile... Dr Fraser is encouraging growers in the south east to dig holes over summer and do some deep soil testing to get a basic understanding of the make-up of the subsoil and to understand what might be holding back yield potential...
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Catalogue: GRDC Media
As manager of the Narrabri MEF, she is part of the team leading a charge to improve drought and heat tolerance in cereals and recognises the pivotal role of the research in improving the long-term crop productivity and profitability of growers across New South Wales and Queensland... Located at the I.A Watson Grains Research Centre, the Narrabri MEF represents a significant investment for GRDC's northern region and provides researchers with the ability to make accurate, repeatable and relevant measurements of drought and heat response in wheat... "The MEF is a nationally funded GRDC project which aims to look at drought tolerant wheat varieties or breeding lines to identify what traits make a wheat cultivar more resistant or tolerant to drought," Dr Pattison said...
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Catalogue: GRDC Media
As manager of the Narrabri MEF, she is part of the team leading a charge to improve drought and heat tolerance in cereals and recognises the pivotal role of the research in improving the long-term crop productivity and profitability of growers across New South Wales and Queensland... Located at the I.A Watson Grains Research Centre, the Narrabri MEF represents a significant investment for GRDC's northern region and provides researchers with the ability to make accurate, repeatable and relevant measurements of drought and heat response in wheat... "The MEF is a nationally funded GRDC project which aims to look at drought tolerant wheat varieties or breeding lines to identify what traits make a wheat cultivar more resistant or tolerant to drought," Dr Pattison said...
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Catalogue: GRDC Research Summaries
An improvement in the efficiency of soil nitrogen cycling is expected to reduce nitrous oxide emissions... Existing farmer networks (Southern Farming Systems - Hamilton Branch, Horsham East Top Crop Group and the Birchip Cropping Group) will be used to help develop the key messages, so that they clearly demonstrate their relevance and importance to commercial cropping farms... Key extension messages at field days and fact sheets will focus on efficient nitrogen use by utilising existing tools (ie Yield Prophet, deep soil testing) for more informed nitrogen fertiliser decision making...
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Catalogue: GRDC Research Summaries
An improvement in the efficiency of soil nitrogen cycling is expected to reduce nitrous oxide emissions... Existing farmer networks (Southern Farming Systems - Hamilton Branch, Horsham East Top Crop Group and the Birchip Cropping Group) will be used to help develop the key messages, so that they clearly demonstrate their relevance and importance to commercial cropping farms... Key extension messages at field days and fact sheets will focus on efficient nitrogen use by utilising existing tools (ie Yield Prophet, deep soil testing) for more informed nitrogen fertiliser decision making...
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Catalogue: GRDC Final Reports
It is recommended that research be undertaken to develop a simplified nitrate sorption method and to determine the distribution of soils in the western grains region where retardation of nitrate is a significant factor for making N fertiliser decisions... Simulation experiments in the project showed that for duplex soils, depth to the K-rich B horizon is an important determinant of the yield response to K fertiliser... Results from the project indicate an opportunity to re-balance investment from P fertiliser that is building up soil P levels, to the alleviation of K deficiency and acidity which limits yields in a large proportion of crops (8% and 70%, respectively)...
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Catalogue: Ground Cover
Deep soil testing to 40 centimetres or below across Western Australia's agricultural regions has revealed there is more nitrogen in the subsoil that can be accessed by crops than previously realised... Testing to the depths provides detailed mineral nitrogen (ammonium plus nitrate) profiles through subsoil layers and can help diagnose any potential crop production constraints, such as an acid band, compaction or hardpan... Where there were no root constraints in the subsoil, deep mineral nitrogen found at 100cm to 120cm was up to 60 per cent as effective as the same amount of nitrogen in 0 to 20cm and Dr Oliver says it should be accounted for in fertiliser decisions in these situations...
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Catalogue: Ground Cover
South coast soils turned upside down.. "Where we used the machine, the canola roots had penetrated to a depth of 18cm in the first four weeks after sowing, compared with 8cm for canola roots in the untreated area," he says... "Behind the discs, we have tynes spaced at 280 millimetres that plough to a depth of 30cm, bringing clay to the surface, busting it up and spreading it through the soil profile," Ashley says...
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