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soil strength

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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 and Food, Western Australia... Overall, 60-70 per cent of flour is used in traditional flat breads, 20-25 per cent of flour is used in western style breads and 5-10 per cent is used in cakes and biscuits... In summary, canola varieties sown 2-3 weeks earlier than normal (early to mid April) can be grazed in winter prior to bud elongation (usually providing 600-800 dse grazing days/ha) and recover with no impact on yield or oil...
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Catalogue: GRDC Research Summaries
The project assesses how strategic irrigation can be used to overcome the complexities of duplex soils to maximise yield and water-use efficiency (WUE) of barley through maximising root depth and distribution... To date, field trials with barley have been conducted in the 2009 and 2010 growing seasons under contrasting irrigation regimes in Cambridge, Tasmania on a duplex soil (output 1)... Strategic irrigation of barley was demonstrated to have a positive influence on grain yield, rooting depth and distribution in duplex soils...
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Catalogue: Ground Cover
Soil compaction, including its remediation and prevention, is an issue that continues to challenge many growers... In response to grower requests on the peninsula, researchers Cathy Paterson, Ben Ward and colleagues at the South Australian Research and Development Institute (SARDI) Minnipa Agricultural Centre have embarked on a project that they hope will better define the causes and cost of soil compaction in the region... Six sites that represent the major soil types across Eyre Penisula have become the basis for replicated trials, one of them a broadacre trial...
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Catalogue: GRDC Updates
Twenty cows were moved through the race and depth of hoofprint, penetration resistance at the base of hoofprints, and aggregate stability and size were measured before and after they passed through... Eleven weeks later, following 3 partial wetting/drying cycles involving 160 mm of rainfall, depth of hoofprints were again measured and aggregate stability determined... Table 1: Stocking rate effects on soil moisture, hydraulic conductivity, penetration resistance from 70-150mm and aggregate stability in a Black Vertosol following 21 days grazing with 0, 3 or 9 400 kg steers on 0.4 ha...
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Catalogue: GRDC Final Reports
The main findings were that raised beds provided improved drainage and were consistently drier than conventional cropping... In 2003 wheat grew better on the conventional cultivation than the raised beds, a difference that continued through to harvest when significantly greater grain yield was measured on the conventional cultivation (6.9 t/ha)... The findings from the project provide additional knowledge of the key soil physical properties, together with crop yields, on raised beds compared with cropping on conventional cultivation and pasture in south-western Victoria...
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Catalogue: GRDC Updates (West)
Impact of soil inversion, soil dilution and claying on non-wetting sandplain soils Stephen Davies, Peter Newman and Breanne Best, Department of Agriculture and Food, Western Australia.. Soil penetration resistance was measured with a Rimik CP40 cone penetrometer when the soil was at field capacity in both trials... The soil pH deeper in the soil profile was not measured at the time but is assumed to increase to around 5, which is typical for the soil type...
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Catalogue: GRDC Factsheets
Deep ripping not appropriate for all soil types A comprehensive understanding of the cause and location of high soil strength is required before undertaking deep ripping as research has shown it is does not provide an economic solution in some soil types... KEY POINTS Deep ripping of compacted soils is most likely to improve grain yields on sandy soils and where compaction has occurred on upper parts of the soil profile through machinery traffic or livestock trampling... Overall, compacted subsoils impede root growth, causing reduced plant vigour and poorer water-use efficiency as roots have limited access to water and nutrients, especially in the subsoil...
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Catalogue: GRDC Factsheets
Deep ripping not appropriate for all soil types A comprehensive understanding of the cause and location of high soil strength is required before undertaking deep ripping as research has shown it is does not provide an economic solution in some soil types... KEY POINTS Deep ripping of compacted soils is most likely to improve grain yields on sandy soils and where compaction has occurred on upper parts of the soil profile through machinery traffic or livestock trampling... Overall, compacted subsoils impede root growth, causing reduced plant vigour and poorer water-use efficiency as roots have limited access to water and nutrients, especially in the subsoil...
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Catalogue: GRDC Updates
A subset of the data showing the effects of stubble cover and grazing on summer water storage is reported ... Infiltrometer measurements taken in autumn 2010 showed that although grazing had reduced infiltration rates relative to the un-grazed control, infiltration in the un-grazed canola paddock surrounding the experiment was just as low... Grain yield of canola (Tawriffic TT sown 15 April 2010) sown over grazing treatments at Temora, and PAW measured at canola maturity on 12 November 2010...
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Catalogue: Ground Cover
Dr Neil Fettell checks stored soil water with a neutron probe at Condobolin, NSW - By Nicole Baxter.. Dr Hunt says the extra water in the ungrazed treatments was stored deeper in the profile, which suggests the difference resulted from improved infiltration rather than reduced evaporation... In summary, Dr Fettell says the results from the two trials support earlier research and suggest that stubble is most beneficial where the summer rainfall intensity is high, unstable soil surface structure results in low infiltration rates and slopes are enough to encourage runoff...
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