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phosphorous management

Catalogue: GRDC Media
Over the next year, new research will provide Western Australian growers with information to compare the cost effectiveness of purchasing different information layers for variable rate technology (VRT) zone application maps... In addition to a comprehensive literature review, knowledge and experiences from growers, agronomists and precision agriculture practitioners about the benefits and drawbacks of each information layer will be incorporated into the study... "With seeding well underway in the west, decision making about the cost effectiveness of purchasing different map layers for variable rate technology (VRT) zone application will be top of mind for many growers," Mr White said...
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Catalogue: GRDC Media
For grain growers who thought they were already shovelling out the nitrogen every year, 's a sobering thought... Dr Angus says the rate of decrease appears to be linear over 10 to 30 years but after about 50 years, turns out to be curved and soil N eventually flat-lines... Dr Angus says it is likely that gross margins underestimate the profitability of the mixed pasture-crop system by not accounting for other synergies between pastures and crops...
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Catalogue: GRDC Updates
Soil testing can be used to assess the likely nutrient constraints, but soil testing and soil test interpretation is not a precise science... To summarise a number of trial results, some sites had consistent increases in crop growth for crop-after-crop; others were more hit-and-miss... Nutrient rates used are 40 kg P (MAP or a fluid source), 200 kg K (SOP or MOP), and 40-80 kg S (SOA or ATS), with the high application rates designed to allow impacts to be followed through an extended crop rotation...
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Catalogue: GRDC Updates
Dry weight response of crops to increasing P levels with and without mycorrhizal fungi in the soil... Unlike saprobic soil fungi, which colonise and break down organic matter and do not require a host plant in the system to complete their lifecycle, arbuscular mycorrhizal fungi (AMF), the type found in cropping systems, do require the presence of a host to reproduce and are called obligate symbionts... Having adequate populations of mycorrhizal fungi present in soils can be beneficial and in some cases essential for crop growth...
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Catalogue: GRDC Updates
Optimising water use efficiency in western NSW.. The relative merit of different rotation crops can also be assessed by looking at the amount of water they extract from the soil profile... Research has shown that canola is better able to extract phosphorus (P) from soil than wheat (Bolland and Brennan 2008) meaning that maximum yield of canola can be achieved with lower P application than is required for wheat...
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Catalogue: GRDC Media
Break crops could hold key to tap soil phosphorus reserves.. University of Adelaide research, funded by the GRDC, on break crops has demonstrated positive effects on phosphorus uptake and yield in subsequent wheat crops... Wheat following a break crop has a greater P uptake and higher yield than continuous wheat rotations...
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Catalogue: GRDC Updates
CSIRO has a long track record of making major on-going investment into the genetic improvement of wheat varieties and their agronomy to ensure they fit the target requirements for both the main wheat belt and the High Rainfall Zones of Australia... Underpinning the development of the traits provided to Australian breeders are a series of basic technologies that we are applying to our work... We outline the state of current research efforts supported by public funds (CSIRO, GRDC) with particular emphasis being given to developments that we believe will assist plant breeders in Australian breeding companies to deliver new high quality, well adapted productive wheats that have the ability to counter major constraint factors...
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Catalogue: GRDC Media
Studies funded by the Grains Research and Development Corporation (GRDC) are investigating whether crop stubbles offer useful amounts of phosphorus (P) to plants during the growing season... The research is being conducted by the University of Adelaide which plans to develop a better understanding of how P is released from stubble and then taken up by subsequent crops... ENDS Caption: University of Adelaide research student Sarah Noack is involved in a study which plans to develop a better understanding of how P is released from stubble and then taken up by subsequent crops...
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Catalogue: GRDC Media
Soil testing the key to fertiliser savings.. According to the Crop Nutrition Fact Sheet published recently by the Grains Research and Development Corporation (GRDC), results from more than 100,000 recent soil tests in the south-west of WA showed that most growers are operating at or above the soil P levels required... If the tests show that soil P status is sufficient, there may be an opportunity for growers to save money on P fertiliser by cutting back to a maintenance rate...
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Catalogue: GRDC Updates
Samples of chaff were collected from four different chaff carts during harvest 2011... The grain yield and crop harvest index were used to estimate the total crop residue in the paddock... The cost of a unit of potassium was estimated at the time of writing and will vary considerably...
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