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mineral nitrogen

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Catalogue: Ground Cover
Stop moisture and nitrogen loss: manage summer weeds.. Trials highlight the value of controlling weeds to prevent losses of nitrogen and soil moisture in summer fallows... "The trials highlighted the importance of controlling summer weeds to conserve nitrogen as well as moisture," Mr McMaster says...
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Catalogue: GRDC YouTube channel
Low protein -- is it timing, decision making or something else... Low protein in cereal grains is indicative of poor nitrogen supply to the grain during the grain fill period... Technology to reduce spray drift GCTV: Drift Reducing Technology..
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Catalogue: Ground Cover
Trials have shown significant denitrification in summer after post-harvest mineralisation of crop residues such as chickpea crops and canola... In 'normal' dry years, losing soil nitrate through denitrification is a relatively small problem - a bigger issue now is the slowly declining soil nitrogen reserves across the region, especially after multiple above-average yields... Wet summers increase the potential to lose nitrogen through the natural process of denitrification, so the potential for losses is higher under those conditions...
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Catalogue: Ground Cover
Predictable protein levels getting the nitrogen right.. In 2012 low soil nitrogen and subsequent grain protein were compounded by: wet summer fallows leading to waterlogging and denitrification; depletion of subsoil mineral nitrogen reserves by crops in 2009, 2010 and 2011; a decline of organic matter in the soil due to continuous cropping; and lack of legumes in rotations to supplement the decline in nitrogen from organic matter... If we want a return to high protein grains, we need to work out how to get that nitrogen back in the system," Dr Dowling says...
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Catalogue: Ground Cover
Stop moisture and nitrogen loss: manage summer weeds.. Trials highlight the value of controlling weeds to prevent losses of nitrogen and soil moisture in summer fallows... "The trials highlighted the importance of controlling summer weeds to conserve nitrogen as well as moisture," Mr McMaster says...
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Catalogue: Ground Cover
Data presented showed that farm practices that have a positive impact on soil biology include no-till, effective crop sequencing (rotations), lime applications and building up soil carbon... Soil microbiologist Dr Lori Phillips of the Victorian Department of Environment and Primary Industries (DEPI) says there are direct links between the microbes that release nitrogen from crop residues and soil sources, and the microbes that convert fertiliser nitrogen to crop-available nitrogen... In related research, the University of Western Australia's Professor Dan Murphy said his work had shown that organic molecules released from plant roots had more influence on the microbes that can retain (immobilise) nitrogen than soil organic carbon levels...
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Catalogue: GRDC Factsheets
experiments in southeastern Australia have shown that canola provides an effective break following cereal crops... influence of rotation Recent research has shown a strong influence of rotation choice on the build-up of inoculum... Cereals provide the most rapid increase in inoculum...
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Catalogue: Ground Cover
Data presented showed that farm practices that have a positive impact on soil biology include no-till, effective crop sequencing (rotations), lime applications and building up soil carbon... Soil microbiologist Dr Lori Phillips of the Victorian Department of Environment and Primary Industries (DEPI) says there are direct links between the microbes that release nitrogen from crop residues and soil sources, and the microbes that convert fertiliser nitrogen to crop-available nitrogen... In related research, the University of Western Australia's Professor Dan Murphy said his work had shown that organic molecules released from plant roots had more influence on the microbes that can retain (immobilise) nitrogen than soil organic carbon levels...
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Catalogue: Ground Cover
Deep soil testing to 40 centimetres or below across Western Australia's agricultural regions has revealed there is more nitrogen in the subsoil that can be accessed by crops than previously realised... Testing to the depths provides detailed mineral nitrogen (ammonium plus nitrate) profiles through subsoil layers and can help diagnose any potential crop production constraints, such as an acid band, compaction or hardpan... Where there were no root constraints in the subsoil, deep mineral nitrogen found at 100cm to 120cm was up to 60 per cent as effective as the same amount of nitrogen in 0 to 20cm and Dr Oliver says it should be accounted for in fertiliser decisions in these situations...
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