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ammonium

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...
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Catalogue: GRDC Updates
Liquid Nitrogen: pros and cons of different formulations.. The use of liquid nitrogen fertiliser is not new to australian grains production... Leaf burn from spotting is dessication to localised areas from too high a salt concentration in the fertiliser solution leading to cell-burst and necrosis, leaf tip and marginal burn is from very rapid uptake and translocation without metabolism of predominantly Urea (can also be from ammonium)...
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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...
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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...
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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: 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
Professor Robert Park has won the New South Wales Excellence in Biological Sciences award for his contribution to the global effort to fight rust diseases... Professor Park is the chair of sustainable agriculture and director of cereal rust research at the University of Sydney, and also contributes a regular column to Ground Cover ... Data covering selection criteria for varieties of wheat, lupins, vetch, chickpeas, canola, oats, lentils, field peas, triticale and faba beans are included in the Sowing Guide 2014 ...
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