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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 Research Summaries
Salinity affects plant growth through impacts on plant water relations... We expect that the yields of cultivars in the water-limited environment will be highly correlated with the yields on the saltland site at Ballidu, but the yields in the non water-limited environment will not be correlated with the yields in either the water-limited or the saltland environment... Drought is impacting on the productivity of cereals in the drier parts of the wheatbelt and farmers need access to the best cereal cultivars for particular soils, timely "soil type specific" advice on how to respond to dry seasons, and advice about whether certain kinds of soils of low productivity should be withdrawn altogether from cereal production...
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Catalogue: GRDC Research Summaries
Salinity affects plant growth through impacts on plant water relations... We expect that the yields of cultivars in the water-limited environment will be highly correlated with the yields on the saltland site at Ballidu, but the yields in the non water-limited environment will not be correlated with the yields in either the water-limited or the saltland environment... Drought is impacting on the productivity of cereals in the drier parts of the wheatbelt and farmers need access to the best cereal cultivars for particular soils, timely "soil type specific" advice on how to respond to dry seasons, and advice about whether certain kinds of soils of low productivity should be withdrawn altogether from cereal production...
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Catalogue: GRDC Media
A study into the use of instantaneous pH probes inserted directly into moist soil to measure pH has found they are capable of making accurate measurements and are cheaper than traditionally used soil tests when many samples are required across a paddock... Soil pH is typically measured in WA by taking a soil sample and sending it to a laboratory where the soil is mixed in a solution of 1:5 CaCl2 and measured with a glass probe... But instantaneous pH probes provide the potential to relatively quickly and cheaply measure soil pH at many sites across a paddock, allowing pH and lime application maps to be drawn...
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Catalogue: GRDC Media
A study into the use of instantaneous pH probes inserted directly into moist soil to measure pH has found they are capable of making accurate measurements and are cheaper than traditionally used soil tests when many samples are required across a paddock... Soil pH is typically measured in WA by taking a soil sample and sending it to a laboratory where the soil is mixed in a solution of 1:5 CaCl2 and measured with a glass probe... But instantaneous pH probes provide the potential to relatively quickly and cheaply measure soil pH at many sites across a paddock, allowing pH and lime application maps to be drawn...
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Catalogue: GRDC Updates
If we use the same bulk density as above (1.2 g/cm3) and restrict our calculations to the top 10 cm of soil where organic carbon is most easily increased, at 2% carbon the soil would contain 24 tonnes C/ha... In Figure 4 the estimated changes in soil organic carbon content (%) of the 0-10 cm layer that occur with different levels of wheat production (grain yield) are presented... Results indicate that a sustained productivity of about 4 tonnes/ha/year of wheat grain yield is required to maintain the equilibrium soil carbon content at Roseworthy (Figure 4 a)...
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Catalogue: Ground Cover
Probing new ways to map pH.. Planfarm's mobile soil-pH-testing unit that is being used this year to further assess the use of instantaneous pH probes in WA following GRDC-funded research last season... For the 2014 RCSN project, Mr Quinlan compared two types of probes to measure soil pH - the Veris pH detector (containing an antimony probe that is inserted directly into the soil) and the traditional glass pH probe...
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Catalogue: Ground Cover
Probing new ways to map pH.. Planfarm's mobile soil-pH-testing unit that is being used this year to further assess the use of instantaneous pH probes in WA following GRDC-funded research last season... For the 2014 RCSN project, Mr Quinlan compared two types of probes to measure soil pH - the Veris pH detector (containing an antimony probe that is inserted directly into the soil) and the traditional glass pH probe...
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Catalogue: GRDC Final Reports
Changes to farming practices and resultant improvements to water storage efficiency, coupled with the high variability in climate, have increased demand for improved understanding of soil water management in agriculture... Investigation of technologies to expedite measurement of soil water has resulted in the development of the tools, SoilMapp and Soil Water Express and improved understanding of the potential for electromagnetic induction (EMI) and spectrometry to contribute to soil water management... If the accuracy of decision support tools is to be increased, there is a continuing need for the characterisation of soils at the paddock or broader spatial scales to fill existing data 'black holes'...
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