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soil testing

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Catalogue: GRDC Media
Soil testing with rake and boot.. Research is updating 'critical soil test values' which is improving interpretation of soil test results and helping Western Australian grain growers make better fertiliser decisions... Findings from crop nutrition research and guidelines to help growers conduct soil testing and apply fertiliser effectively are outlined in a Soil Testing for Crop Nutrition Fact Sheet and More Profit from Crop Nutrition Ground Cover Supplement...
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Catalogue: GRDC Media
Soil testing with rake and boot.. Research is updating 'critical soil test values' which is improving interpretation of soil test results and helping Western Australian grain growers make better fertiliser decisions... Findings from crop nutrition research and guidelines to help growers conduct soil testing and apply fertiliser effectively are outlined in a Soil Testing for Crop Nutrition Fact Sheet and More Profit from Crop Nutrition Ground Cover Supplement...
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Catalogue: GRDC Research Summaries
" DGT as the soil test of choice for predicting phosphorus requirements of grain crops.. Work funded previously by GRDC has shown that a new soil test sensor, known as Diffusive Gradients in Thin Films (DGT) provides an accurate measure of soil phosphorus available to wheat... The network of collaborators established in previous projects will be used to ensure as many regions and trials are accessed as possible - both current and archived soil samples will be analysed using DGT as well as the traditional Colwell, the resin test used by researchers and the Colwell plus PBI modification...
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Catalogue: GRDC Updates
If we may accept that S removal in grain is lower than commonly accepted... S requirements of the trial yields could have been satisfied even considering an arbitrary figure of only 50% efficiency, except the Nyngan site... The figure of 50% above has no sound basis the author is aware of...
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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
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... Audio download: Click on the audio link below to hear Dr Mike Bell from the University of Queensland's Alliance for Agriculture and Food Innovation (QAAFI) discussing sub-soil testing ...
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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: Ground Cover
Clay and spading helps rebuild non-wetting soils.. On 19 July 2010, after about 78mm of rain, the nil treatment (Figure 1) had a lower plant density and went on to yield 0.66t/ha, while the 260t/ha of clay incorporated by spading plot (Figure 2) had a high plant density and went on to yield 1.41t/ha... In 2010 Trevor had electromagnetic surveys (EM38), gamma-ray spectrometry (radiometrics) and deep soil analysis done for measuring and mapping the depth to clay and he used these maps in 2011 to strictly apply clay only where it was needed...
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Catalogue: GRDC Updates (West)
The relative effectiveness was calculated at the effectiveness of N at a depth compared with the effectiveness of N in the top-soil (0-0.2 m layer)... (A assuming Bulk density of 1.5), B % of sites measured to that depth not of the 474 cores).. The trials necessarily included whatever deep soil N the crops could access and so the responses will be weighted by that contribution from deep N. For tools such as Yield Prophet , the N at depth is usually measured and included in the model the roots for most of the soils in Yield Prophet are set to unconstrained growth...
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Catalogue: GRDC Publications
Best Practice Guidelines Cotton Farming Systems.. Growers may achieve maximum profitability by applying additional spring-irrigations... The nitrogen requirement of an 8 t/ha wheat crop is approximately 275 kg N/ha studies in 2008 showed that many long-fallow paddocks that lodged had well in excess of this amount of nitrogen available (see Figure 9 (a))...
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