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available phosphorus

Catalogue: Ground Cover
Soil phosphorus can be taken up by wheat roots directly or through beneficial arbuscular mycorrhizal fungi (AMF)... Professor Andrew Smith and his team, which includes Professor Sally Smith, Dr Maria Manjarrez-Martinez and Dr Ann McNeill from the University of Adelaide, are using this technique to demonstrate how important the contribution of mycorrhizas is to phosphorus nutrition and whether break crops can be used to maximise AMF populations... The research team established a field experiment at the beginning of this crop season to follow up and quantify the amount of phosphorus transferred by AMF. Results can also be used to measure the contribution of phosphorus uptake by wheat with different fertiliser applications and to inform new breeding strategies...
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Catalogue: GRDC Media
A new soil test for phosphorus is showing considerable potential for use in Australian calcareous soils, with the help of a PhD project supported by growers and the Australian Government through the Grains Research and Development Corporation (GRDC)... The test, diffusive gradients in thin films (DGT), was originally developed for testing metal contamination in the soils and waterways of the United Kingdom, but with some modifications it has been found to correlate well with plant response to applied phosphorus in deficient Australian soils... Photo caption: "Dr Sean Mason prepares to test soil samples for available phosphorus" Dr Mason found that DGT readings were more accurate than other tests in calcareous soil types in laboratory trials...
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Catalogue: Ground Cover
Laboratory soil testing using DGT, which involves an orange-coloured gel containing iron to bind phosphorus and remove it from the solution... Western Australian growers could benefit from a new soil-testing method for phosphorus, which is reported to be more accurate and less complicated than the Colwell P test commonly used by laboratories... "The solution used in the Colwell P test can sometimes solubilise less available forms of phosphorus," Dr Mason says, adding that this can lead growers to overestimate available phosphorus on both calcareous, alkaline soils and acidic soils containing high levels of aluminium and iron...
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Catalogue: GRDC Media
A new soil test for phosphorus is showing considerable potential for use in Australian calcareous soils, with the help of a PhD project supported by growers and the Australian Government through the Grains Research and Development Corporation (GRDC)... The test, diffusive gradients in thin films (DGT), was originally developed for testing metal contamination in the soils and waterways of the United Kingdom, but with some modifications it has been found to correlate well with plant response to applied phosphorus in deficient Australian soils... Photo caption: "Dr Sean Mason prepares to test soil samples for available phosphorus" Dr Mason found that DGT readings were more accurate than other tests in calcareous soil types in laboratory trials...
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Catalogue: Ground Cover
a Stored moisture measured at sowing via five grainmetric soil cores Switching to alternatives to conventional fertilisers such as monoammonium phosphate (MAP) to correct phosphorus deficiency is unlikely to deliver any hoped-for savings, according to recent research by the New South Wales Department of Primary Industries (DPI)... The benefits of liquid versus granular phosphorus fertilisers had not been adequately assessed in central NSW on such soils prior to this research... Mr McMaster says the potential of a soil to lock up phosphorus is estimated by the PBI, a test used with standard soil analysis...
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