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duplex soil

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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, the DAFWA indices suggest that a more optimistic approach to decision-making is recommended in 2006 and confidence in this assessment would be enhanced if a La Ni a develops... The needs analysis has enabled an assessment of the distribution of farmers along the pathway from initial awareness through to final adoption of CRM information and tools being offered by various organisations...
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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
We have an unpredictable climate so timing the move from pasture to crop is a risk; lucerne is difficult to establish and remove; and the need to manage the water table never stops... "Simplistically, if we look at a six-year phase farming rotation with three years under crop and three years under lucerne, we"re at best achieving 50 percent of potential crop yield over that time," he says... "We"ve found that lucerne"s ability to control recharge is much better from the second year of establishment, so perhaps we have to look at crop being over-sown in the second year," he says...
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Catalogue: Ground Cover
Mr Freeman has been working with Mr Topham to differentially apply lime to his yellow sandy soils, which are highly acidic at depth... Tests have shown a pH as low as 4.1 in some areas... Zone 2 - Acidic gravelly sand over shallow gravel (yellow), PAWC 100 to 134mm: This soil has high aluminium toxicity and gravel increasing at depth, which results in low PAWC. Low PAWC combined with restricted rooting depth reduces plant access to water...
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Catalogue: GRDC Final Reports
The project team identified soil nutrient test kits, ground penetrating radar, remote electrical conductivity (EC) procedures and an instrumented, calibrated tine to measure soil strength as tools that offer value to growers in southern Australia... Several rapid soil tests may be used by growers to improve their knowledge of soil conditions... The use of a calibrated, instrumented tine while cultivating with a machine fitted with a precision GPS allows growers to diagnose and map compacted and hard setting soils (strong soils without structure).This information will allow growers to develop ripping regimes, controlled traffic practices and other amelioration procedures that precisely target these soil structure hazards...
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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, the production and supply of fertiliser accounted for a large proportion (35%) of the GHG produced from wheat production, and occurred in the pre-farm stage (Table 1)... Overall, constraints have a far smaller effect on heavy soils than on sand plain soils...
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Catalogue: GRDC Updates (West)
Agriculture is under increasing pressure to develop management practices to minimise P loss... The modelling predicts that depending on location and the benefit from biochar a farmer can spend between $15 and $165 either buying or producing biochar on farm and break-even... In this type of seasons, P fertiliser placed at 14 cm depth remained in moist soil longer than P placed at 4 or 8 cm and was more available for crop uptake later in the season...
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Catalogue: GRDC Final Reports
pH measurements taken from wet and dry soils can vary if we measure the pH in water because the soil has a "background" salt concentration... To minimise the effect of salt concentration in soil on pH values, pH is now measured in 0.01 molar calcium chloride... As soil testing for phosphorus was originally conducted on the top 10 cm of soil, so the soil pH was only measured for the top 10 cm...
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Catalogue: GRDC Media
Capacitance soil water probes can provide useful information about soil water data when used with adequate professional support... Computer simulation models predict soil water information based on soil tests, soil characterisations and climate/rainfall data... Soil characterisation is about measuring the ability of the soil to hold water for use by a particular crop - or the size of the soil water 'bucket' - and takes into account potential constraints that affect the soil's ability to store water and plant's ability to extract it...
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Catalogue: GRDC Research Summaries
The research program consists of a series of discrete investigations of new and existing technologies (the ""topics"") for their capacity to enhance growers' knowledge of soil conditions... Although the project will seek to review all or most of the topics suggested it will also consult with collaborators to determine which soil property/assessment technique combinations are seen as a priority for making better strategic and tactical agronomic decisions... The topics include the following: Topic 1 - within paddock variability of soils.....
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