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phosphorous

Catalogue: GRDC Updates
A real example, a trial conducted at Condobolin in 2005 comparing DAP and Product A in canola... Figure 1: Canola & alternative phosphorus source "Product A" The chart above shows there was no further significant yield response to phosphorus above 4 kg/ha... 65 kg/ha "Product A" or at an equivalent rate of 65 kg/ha: DAP provides 13 kg P/ha "Product A" provides 4 kg P/ha..
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Catalogue: GRDC Research Summaries
The work will characterise PUE of a diverse range of wheat and barley varieties in the field to identify germplasm with consistently high PUE... The aim of the project is to assess the level of genetic variation in response to phosphorus fertiliser in wheat and barley and to provide plant breeders with the information and genetic tools to improve phosphorus use efficiency of cereals... There are three outputs from this project: (i) it will characterise the response to phosphorus among a large number of varieties of wheat and barley; (ii) it will provide detailed analysis of the reasons why varieties show different response to phosphorus fertiliser and how this relates to their phosphorus use effciency and (iii) through genetic studies it will aim to provide plant breeders with tools to make the selection for phosphorus use effciency easier...
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Catalogue: GRDC Updates
Many soils may already have lost much of this extra, slow release P reserve... Soil testing for available P status commonly involves a Colwell test on the 0-10 cm layer... The paper summarises some recent work that attempts to quantify the differences in availability of sparingly soluble P sources as affected by soil acidification...
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Catalogue: GRDC Updates
Aim to sow large (>5 g/1000 seeds) canola seed to achieve adequate establishment rates from early sowing... Hybrid vigour (heterosis) has an indirect effect (larger seed size) and a direct effect (enhanced vigour) on canola establishment.. The results reported have greatest relevance for an early planting opportunity and a lesser relevance for canola that is dry sown or planted into moisture in May...
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Catalogue: GRDC Updates
Phosphorus application improves grain yield regardless of variety choice, but limit the amount of P applied in direct contact with seed... Due to lack of adequate follow-up rain at both Nyngan and Trangie sites after the in-crop application, only the rate component of 2013 trials is reported ... Although N application can increase grain yield, it may reduce oil concentration in the grain...
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Catalogue: GRDC Media
Soil testing the key to phosphorus management.. Dr Mike Bell, from the University of Queensland's Alliance for Agriculture and Food Innovation (QAAFI), says soil testing is important to understanding the status of these key nutrients, of which native stocks in the soils have been run down over time... Some soils have a heck of a lot and still have a lot; others started with not much and now the well is dry, particularly in the sub soils," Dr Bell said...
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Catalogue: GRDC Media
The new age of soil phosphorus testing is.. Extensive testing over recent years and trial analysis this year have demonstrated that the DGT test offers considerable improvement in predicting soil available P levels on many cropping soils in south-eastern Australia... Dr Mason says the DGT test is a plastic device that uses an iron oxide gel as a P sink, which attracts available P through a membrane...
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Catalogue: GRDC Updates
Chickpeas provide an excellent break crop and gross margin opportunity for growers, and many are now realizing the importance of break crops in a farming system with the current expense of nitrogen... Operationally chickpeas fit very well into many farming systems, often being able to be sown before cereals and generally harvested after... Harvesting on time should be a priority in such a high valued crop...
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Catalogue: GRDC Updates
Managing for least cost rather than most profit.. In summary - For the effort of spraying the paddock twice over summer and an investment of $30/ha, a gain could be achieved in the following wheat crop of $105/ha.. P fertiliser should not be broadcast prior to seeding in 2008 because this approach is only justified in situations where soil P reserves are high and dressings are designed to maintain those reserves - in 2008 simply do not broadcast those paddocks and use the money saved on other inputs which will return better profits...
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Catalogue: GRDC Updates
0-10 cm Zinc DTPA soil test values NSW 2008 by location... We have to maximise income when those 3 good seasons happen... The aim of this data and the economic + risk analysis is to provide you with a framework to assist you thinking through your circumstances: soil test P on each paddock, cash available to be used across all paddocks, and your attitude to risk...
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