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ammonium sulphate

Catalogue: GRDC Updates
There have been several contributing factors to its increased prevalence including: more intensive weed control removing competition and enabling marshmallow to dominate; a reduction of grazing in cropping systems; less cultivation particularly with full cut shears and few cost effective herbicide options (Taylor 2002)... Table 3 shows the significant improvement in marshmallow control when LV Ester 600 is added to glyphosate plus Group G mixes in a trial at Gooroc in 2007... The results in Table 5 indicate that there was no benefit in applying a Group G herbicide with mineral oil in a separate application following an application of glyphosate plus 2,4-D Ester...
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Catalogue: GRDC Media
" the results may be a game changer for northern grain growers because they usually try and time nitrogen applications with rainfall events to avoid loss of nitrogen into the atmosphere due to volatilisation," Mr Clark says... Dr Schwenke said the research looked at how much nitrogen was lost when applied to the soil surface in different formulations at different times... Two fallow paddocks broadcast with urea or ammonium sulphate in spring also had minor losses, except where ammonium sulphate was spread on a paddock with carbonates at the surface when losses were more than 30pc of that added...
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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: GRDC Updates
Volatilisation is the loss of nitrogen to the atmosphere as ammonia gas (NH3) from soils or from fertiliser applied to soil surfaces... We tested all samples with a pHw>7 for their capacity to buffer changes in pH back to 7 (pHBC) as this is where the risk of nitrogen volatilisation ceases (Figure 1)... Urea coated with an organic complex showed no difference from ordinary urea in N volatilisation loss measured in these incubations...
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Catalogue: GRDC Updates
In cracking clay soils of the northern grains region, saturated soil conditions between fertiliser application and crop growth can lead to significant N losses from the soil through denitrification... In 2010, the nitrous oxide emissions measured in the first month (143 mm rain) after sowing wheat averaged 53% of the total measured for the full 12 months after sowing... Our previous research also highlighted the potential for losses of non-fertiliser N from denitrification...
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Catalogue: GRDC Updates
Spray adjuvants have a variety of uses not the least of which is to optimise the activity of post-emergence herbicides on target weeds... For example, some very early studies of glyphosate and spray adjuvants identified that responses to ammonium sulphate were enhanced in combination with certain surfactants present and appeared to be optimised where tallowamine ethoxylates (TAE) were included... The effect was overcome by the addition of ammonium sulphate...
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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...
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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...
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