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nitrogen

Catalogue: GRDC Updates
Soil temperatures have a greater impact on yield than ambient temperatures... Inter-row side dress nitrogen in cereals reduces dependency on rainfall after application... Steve Larocque Box 1696, Three Hills, AB, T0M 2A0 1-403-321-0181 steve@beyondagronomy.com < Keep browsing 0 Responses to Accelerating adoption of innovative agronomy..
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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 Media
Western Australian grain growers may need to consider adjusting 2014 nitrogen fertiliser strategies due to the influence of high stubble loads and a dry summer and autumn on plant available nitrogen in the soil... Mr Ryan suggested growers use these results and assess stubble loads to determine if additional fertiliser was required, and consider adjusting their nitrogen application method at seeding time or using split (separate) nitrogen applications which could decrease any risk of low nitrogen availability... "Knowing your current soil nitrogen status; stubble density; stubble quality (including the amount of nitrogen relative to carbon); and soil moisture content can help you manage fertiliser applications and rates to ensure that adequate nitrogen is supplied to the crop," he said...
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Catalogue: Ground Cover
Bar chart showing yield and oil response of canola to nitrogen applied at seeding.. Mr Street says it is clear that if growers are applying no nitrogen or only small amounts (40kg/ha or less) then in many cases they are sacrificing yield... While, overall, nitrogen application resulted in lower seed oil content (higher protein), Mr Street says a typical one per cent drop required an increase of only 15kg/ha of yield to compensate, which was easily achieved in most cases...
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Catalogue: NVT Online Papers
This section of the Manual relating to Barley has been produced following the annual review by GTA of Standards... Grain exporters must be aware of MRLs of importing countries and which countries accept Codex MRLs... At the conclusion of the test, record the time in seconds...
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Catalogue: Ground Cover
Forum pinpoints nitrogen knowledge gaps.. Research organisations, state departments of agriculture, farming systems groups, advisers, growers and other grains industry personnel gathered at a GRDC forum in July to determine questions that need to be answered by existing and future nitrogen-related research, development and extension (RD&E)... "We need to create accessible opportunities for growers, advisers and researchers to provide input into identifying, designing and delivering RD&E that will have the most impact on-farm...
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Catalogue: NVT Online Papers
The Lower Eyre Peninsula survey showed most paddocks had internal blackleg infection levels below 10% unlikely to suffer a yield or oil content penalty... Current varieties have a number of resistance genes if blackleg overcomes one resistance gene, other resistance genes remain effective and so the crops should not become completely susceptible... Final grain yield after slashing was similar in all varieties (about 0.8 t/ha average), except CB1206 (0.2 t/ha)...
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Catalogue: GRDC Media
New research has revealed that hybrid canola varieties are potentially a profitable break crop option for Western Australia's low rainfall zones and that growers in these areas can make savings by delaying decisions about nitrogen applications for these varieties in particular... DAFWA senior research officer Mark Seymour said the results, presented at this year's Regional Crop Update at Salmon Gums, indicated that hybrid RR lines could provide opportunities for growers in the region to use low rates of nitrogen at seeding and then add more nitrogen, as needed, to reach optimal yield... Mr Seymour said the trial highlighted the importance of assessing the nitrogen status of the crop and ensuring that canola was not over-fertilised in low rainfall areas, as the reduction of oil content levels with increased nitrogen could also lead to big discounts...
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Catalogue: NVT Online Papers
Early work on canola focused on weed management strategies including the breeding of herbicide tolerant canola varieties such as triazine tolerant (TT) varieties which now account for an estimated 90% of canola grown in WA... Research is still being conducted to determine the effect of these viruses on the yield of canola in WA. European work has found seed yield losses of 10-15% associated with this virus disease in canola... The amount of air passed through the grain is measured in litres per second per tonne and varies depending on the particular aeration strategy...
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Catalogue: GRDC Updates
Preliminary studies carried out as part of the project last season, sought to establish whether crop reflectance readings could be related to crop size and plant nitrogen uptake at the key timings for in-crop nitrogen application tillering to flag leaf emergence (GS22 - GS39)... Much of the work on wheat has been conducted in higher yielding irrigated scenarios following Sorghum so that soil nitrogen reserve is sufficiently depleted to ensure a response to nitrogen... Furthermore if a split nitrogen application during stem elongation (GS30 start of stem elongation followed by GS33 - 39 third node to flag leaf emergence) could be employed in the knowledge that it was not inferior to other N strategies, it would not only give a greater flexibility to respond to the season in terms of spring rainfall (for dryland growers), but would also allow the growth changes (e.g. NDVI "change map") to be recorded with crop sensors (on a spatial basis) following the application of the first dose...
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