You are here

ammonia loss

Catalogue: GRDC Updates
Field trials on northwest NSW cracking clay soils (Vertosols) during 2011-2013 showed that surface application of urea led to ammonia volatilisation averaging 11% N loss when applied to fallow soils, and 5% N loss when applied to tillering wheat crops... Compared to urea, losses from ammonium sulfate were less, except when the soil contained >2% calcium carbonate (lime)... At the conclusion of the month, we sampled soils and plants (at in-crop and pasture sites) and measured soil nitrate and ammonium and plant total N. We did not measure N uptake into grain...
Related categories:
Catalogue: GRDC Research Summaries
Enhanced efficiency fertilisers (EEFs), including slow release compounds and urease and nitrification inhibitors, show promise for improving efficiency, increasing management flexibility, and reducing N2O emissions... Enhanced efficiency fertilisers, including controlled release fertilisers and fertilisers amended with urease or nitrification inhibitors, show promise for improving nitrogen use efficiency... The main objective of the project is to assess the benefits of enhanced efficiency fertilisers, particularly nitrification inhibitors, in mitigating nitrous oxide emissions and increasing the efficiency of nitrogen fertilisers for a range of agricultural industries, including cropping (Victoria and NSW), sugarcane (Queensland) and dairy (Victoria), under different climatic conditions that are found across Australia...
Related categories:
Catalogue: GRDC Media
GRDC research queries N losses on northern soils.. The amount of N lost is affected by a number of factors including fertiliser compound, fertiliser form, type of application, timing of application, soil properties, rainfall amount and intensity, and the temperature and windiness after application... The quantity of N lost as ammonia depends on a range of factors including fertiliser compound, fertiliser form, type of application, timing of application, soil properties, rainfall amount and intensity, and the temperature and wind after application...
Related categories:
Catalogue: GRDC Media
GRDC research queries N losses on northern soils.. The amount of N lost is affected by a number of factors including fertiliser compound, fertiliser form, type of application, timing of application, soil properties, rainfall amount and intensity, and the temperature and windiness after application... The quantity of N lost as ammonia depends on a range of factors including fertiliser compound, fertiliser form, type of application, timing of application, soil properties, rainfall amount and intensity, and the temperature and wind after application...
Related categories:
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...
Related categories:
Catalogue: GRDC Updates
Urease inhibitors act by slowing the rate of urea hydrolysis (the process by which N is released from a granule), by inhibiting the action of the enzyme urease, and by doing this the elevated pH hotspot that occurs around the granule is lessened and this reduces the risk of NH 3 loss... The paper presents laboratory and field experiment data that investigated the impact of the urease inhibitor NBPT (Green Urea TM 7 or 14 in Australia), on rates of urea and NH 3 loss... The experiment showed that NH 3 loss in autumn was greater than in spring (Table 1) and that whilst the inhibitor was effective at both times, the real benefit in terms of N saved was only seen in autumn...
Related categories:
Catalogue: GRDC YouTube channel
" GRDC Grains Research Updates 6-7 February 2013, Southern Region, Ballarat VIC. Helen Suter 03 October 2013 Helen Suter, University of Melbourne discusses her research into the impact of urease inhibitors on ammonia loss... Ammonia loss from surface applied granular urea can be high, with up to 30% loss recorded from pastures in southern Australia... Ammonia loss from surface applied granular urea is highly dependent on micro-climatic conditions...
Related categories:
Catalogue: GRDC Media
Graeme Schwenke, NSW Department of Primary Industries (NSW DPI) soil scientist, says field trials with urea showed that ammonia loss due to volatilisation averaged 11% (5-19%) when applied to fallow paddocks, and 5% (3-8%) when applied to wheat crops... "At the time the crystalline form was comparable in price per unit N to urea and people were spreading it on fallow paddocks ahead of a crop but weren't sure how much would be lost through volatilisation... "Our research showed that volatilisation losses from ammonium sulphate were often only half that from urea, unless the soil contained calcium carbonate (lime) where the opposite was the case...
Related categories:
Catalogue: GRDC Media
Graeme Schwenke, NSW Department of Primary Industries (NSW DPI) soil scientist, says field trials with urea showed that ammonia loss due to volatilisation averaged 11% (5-19%) when applied to fallow paddocks, and 5% (3-8%) when applied to wheat crops... "At the time the crystalline form was comparable in price per unit N to urea and people were spreading it on fallow paddocks ahead of a crop but weren't sure how much would be lost through volatilisation... "Our research showed that volatilisation losses from ammonium sulphate were often only half that from urea, unless the soil contained calcium carbonate (lime) where the opposite was the case...
Related categories: