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phosphorous management

Catalogue: GRDC Updates
The database underlying the BFDC Interrogator contains the results of more than 5000 soil test calibration experiments conducted in Australia since the 1950s... Soil test-crop response (N, P, K and S fertiliser) trials have been undertaken by many different organisations in Australia since the late 1950's... There have been a number of scientific publications (Crop & Pasture Science Special Issue, Volume 64) derived from the trial data contained within the BFDC dataset...
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Catalogue: GRDC Updates
Agricultural soils have lost approximately half (~ 50 t/ha) of their organic carbon since the industrial revolution, a loss that has greatly contributed to soil degradation... We have shown, in experiments with wheaten straw incubated in a variety of soils, that the conversion of the straw into humus (which is much richer in N, P and S than are crop residues) is increased three to tenfold by augmenting the residues with supplementary nutrients according to the established ratios... We hypothesised that adding some extra nutrients (N, P and S) would lead to more microbes being formed than without the extra nutrients and that this would lead to faster stubble decomposition and more plant-C being transformed into humus-C because, we believe, humus is largely dead microbes not dead plant material...
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Catalogue: GRDC Media
Photo: GRDC Northern Panellists inspect GRDC-funded winter crop trials in northern NSW... The checklist gives growers a comprehensive 'to do list' that will help growers maximise the potential that each year offers so they will be satisfied when harvest rolls around and yield and protein levels come in... Rotations - top of the list is the selection of crops and varieties as rotations, summer and winter, have become essential to our farming system in terms of controlling weeds and diseases...
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Catalogue: GRDC Media
Dr Bell, who heads up the Soils and Farming Systems research team at UQ's Queensland Alliance for Agriculture and Food Innovation (QAAFI), said many farmers in the north were not getting their nutrient inputs right, and solving the problem could mean rethinking their entire cropping systems... "Legumes offer a solution in that area because they are a way of getting nitrogen into the cropping system to then allow us to divert money being spent on nitrogen for sorghum and wheat, into phosphorus, potassium and sulfur," Dr Bell said... Audio download : Listen to Dr Mike Bell, from the Soils and Farming Systems research team at UQ's Queensland Alliance for Agriculture and Food Innovation (QAAFI), discuss nutrient deficiency...
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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: GRDC Updates
In a survey conducted in 2011 of sheep producers in the mixed-farming zone of the Hume Livestock Health and Pest Authority (LHPA) in southern NSW, 42% of respondents identified that they had grazed late pregnant or lambing ewes on dual-purpose wheat during the period 2005-2010... Given the above statistics, there is both a perception and a reality of the potential for high losses in reproducing ewes grazing dual-purpose wheat... In a field trial in 2010 with lambing merino ewes on a wheat crop near Balldale in southern NSW we observed only a 1% mortality rate in ewes grazing dual-purpose wheat...
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Catalogue: GRDC Updates
The use of biotechnology will play a significant role if Australia is to continue to be a major player in the global grains market... But currently growers and the general public are hearing conflicting view points on whether this technology will benefit Australia, or whether we'd be better off without genetically modified crops... The reduced usage of herbicides plus yield benefit obtained from the ability to seed early and control weeds, more than covers the additional cost...
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Catalogue: GRDC Updates
*Note - the report may contain independently supported projects, which complement the work in this GRDC research program... CTF systems support and maximise new technologies.. CTF systems are farming systems built on the simple concept of controlled traffic or permanent wheel tracks...
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Catalogue: GRDC Updates
At current fertiliser prices and by using the products tested in this trial, the application of balanced N, P, Mg, K and Zn would increase wheat gross margins by approximately $77.60 /ha... The chemistry of P placement; banding versus broadcast Primary researchers: Kylie Dodd, Ganga Hettiarachchi and Mike McLaughlin In P responsive soils, fertiliser banding is used to increase efficiency by improving early root contact with the fertiliser... The results suggest that increased granular fertiliser efficiency with banding was primarily due to improvements in early root contact with fertiliser P rather than its effect on P fixation...
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Catalogue: GRDC Media
Digging into history to guide future fertiliser use.. History is helping to shape the future when it comes to the use of fertiliser in Australian cereal, pulse and oilseed crops... Results from soil test-crop response trials conducted across Australia over the past half a century are being collated for a new national data bank designed to assist with fertiliser application recommendations in years to come...
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