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nitrogen loss

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Catalogue: GRDC Updates
Controlling summer weeds increased: - Canola grain yield by 830 kg/ha where full weed control was implemented... Plant available water (mm) for each of the four spray treatments measured at sowing... Level of mineral nitrogen (kgN/ha) for four spray treatments measured at sowing...
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Catalogue: Ground Cover
Southern Farming Systems chief executive officer Jon Midwood says there is scope for late-season nitrogen application to become more popular, given a soft finish to the season... "Some of the sites we trialled already had adequate nitrogen because of high residual levels, or the grower had applied more nitrogen prior to GS32," Mr Midwood says... "Also spreading widths are getting wider and there may be a case for considering liquid fertilisers because they can be applied through a boom-spray at the correct width, compared to a spinning disc spreader which can be limited by wind conditions and machine set-up," Mr Midwood says...
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Catalogue: Ground Cover
Southern Farming Systems chief executive officer Jon Midwood says there is scope for late-season nitrogen application to become more popular, given a soft finish to the season... "Some of the sites we trialled already had adequate nitrogen because of high residual levels, or the grower had applied more nitrogen prior to GS32," Mr Midwood says... "Also spreading widths are getting wider and there may be a case for considering liquid fertilisers because they can be applied through a boom-spray at the correct width, compared to a spinning disc spreader which can be limited by wind conditions and machine set-up," Mr Midwood says...
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Catalogue: Ground Cover
To reduce losses avoid unnecessarily high nitrogen rates.. Dr Schwenke says nitrate denitrification losses can be large, but require a combination of low soil oxygen (an extreme example is when soils are waterlogged for an extended period), high soil nitrate concentration (soon after soils have been fertilised) and readily available (labile) carbon to support an active microbial community... According to Professor Bell, the results showed that between 0 and 44 per cent of the applied nitrogen was not able to be recovered in the soil or plant at harvest, with in-season rainfall, both timing and amount, and soil carbon and nitrogen status having a major impact on these seasonal losses...
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Catalogue: GRDC Research Summaries
Nitrogen losses through volatilisation in this region are potentially high due to the alkaline soil pH, presence of lime in some soils, windy conditions and high temperatures in summer... Our preliminary lab work has demonstrated the importance of naturally occurring lime in soils for setting the potential for nitrogen losses... . If we demonstrate that current applications of surface-applied nitrogen fertiliser are leading to substantial gaseous losses to the atmosphere, farmers will review their practice and opt for less wasteful methods of fertiliser application...
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Catalogue: Ground Cover
Top-dressing nitrogen onto crops, fallows and pastures may not be as risky as is generally thought if rain does not fall soon after application... Nitrogen volatilisation losses were assessed in 15 paddocks covering four scenarios: top-dressing wheat; autumn fallow broadcasting ahead of winter cropping; spring fallow broadcasting ahead of summer cropping; and autumn and spring fertiliser application to a grass-based pasture... How much is lost depends on a range of factors including rainfall amount, soil moisture, temperature, pH, naturally occurring lime in the soil, ground cover, wind, soil-clay percentage and fertiliser type...
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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 Updates
In 2011 we measured nitrogen volatilisation losses in 3 scenarios; (1) top-dressing wheat, (2) spring fallow broadcasting, and (3) autumn and spring fertiliser application to a grass pasture... We applied nitrogen fertilisers at locally relevant rates to 50-metre-diameter circular plots using either hand spreading (solid fertilisers) or a quad bike sprayer fitted with streaming-bar nozzles at 10 cm spacing (liquid fertilisers)... We used a grass pasture near to trial the method in autumn before the main trials began, and included a tropical grass pasture near Caroona in spring when measuring paddocks 5 & 6...
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Catalogue: Ground Cover
Soils with high levels of both phosphorus and potassium availability have the potential to boost cereal plant nitrogen and water use efficiency (NUE and WUE), leading to cost reductions and improved grain yields... Dr Duncan says availability of phosphorus has potential to lift NUE because it can increase total root length, root proliferation and below and above-ground biomass, which directly affects the plant's ability to capture nitrogen and store it in above-ground tissues... "Assuming there are no other soil constraints to limit root growth and development, these results indicate that higher soil phosphorus and potassium levels have the potential to reduce the amount of nitrogen needed for crops to reach their rainfall-limited yield potential...
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Catalogue: GRDC Final Reports
Increase the direct exposure of agency researchers to key prioritised industry research questions and needs... A secondary component of this work was to examine the impact of early desiccation timing to both maximise the opportunity to save soil moisture and potentially shorten the re-cropping interval... The clear advantage over previous approaches is to ensure that the actual question or focus of this work is much more driven by industry rather than by the researcher...
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