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nitrogen uptake

Catalogue: GRDC Publications
Influence of fungicide rate (mean of fungicide products - four site mean) Stem rust control assessed over the four trial sites revealed that using high rates was essential for the control of the disease, even if the fungicide had been applied prophylactically (before infection was visible in the crop)... Influence of cultivar resistance and fungicide application (Prosaro ) on yield and stem rust severity measured on the flag sheath 18 days after fungicide application at early dough (GS82) and assessed at mid dough - physiological maturity (GS85-90) - Bairnsdale, Gippsland, Victoria, 2010... The yield potential for the crop with no nitrogen applied is estimated at GS30 from the results of numerous of trials conducted in that region where NDVI at GS30 is divided by the number of growing degree days (GDD) greater than 0 C since planting, referred to as the INSEY units (in season estimate of yield)...
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Catalogue: GRDC Updates
The current practice of relatively shallow applications of nitrogen and phosphorus are confirming yield responses to these nutrients in the long-term on the Darling Downs... Results of the experiments suggest that phosphorus is a key element for increasing crop growth and performance... The measurements taken now include some "farmer practice" references to benchmark against, or how much crop can be grown just doing as you are now...
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Catalogue: Ground Cover
Around the world cereals, oilseeds and pulses that make better use of applied nitrogen fertiliser are under development.. The idea looks simple on paper - endow all the major cereals, legumes and oilseeds with an enhanced potential to take up, assimilate, store or move nitrogen into grain thereby maximising yield and grain quality while reducing costs and waste... Overall, the signs are promising that NUE traits can be developed, allowing nitrogen's yield-enhancing value to be retained while diminishing its spiralling costs...
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Catalogue: Ground Cover
Nitrogen benchmarking for better management.. "Despite the importance of nitrogen for crop yield and its incidence in the variable costs of farm business, there is no established benchmark to assess the nitrogen status of crops," Dr Sadras explains... "The nitrogen nutrition index is the only method to unequivocally measure the nitrogen status of the crop, and removes much of the uncertainty related to soil and seasonal conditions that are typical of conventional crop diagnostics," Dr Sadras says...
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Catalogue: Ground Cover
Around the world cereals, oilseeds and pulses that make better use of applied nitrogen fertiliser are under development.. The idea looks simple on paper - endow all the major cereals, legumes and oilseeds with an enhanced potential to take up, assimilate, store or move nitrogen into grain thereby maximising yield and grain quality while reducing costs and waste... Overall, the signs are promising that NUE traits can be developed, allowing nitrogen's yield-enhancing value to be retained while diminishing its spiralling costs...
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Catalogue: Ground Cover
"Growers apply nitrogen at these late timings solely to increase grain-protein levels," says Richard Daniel, chief executive officer of NGA. ".. The project assessed the effect of nitrogen on protein accumulation, the likelihood of economic benefit, and whether there was an optimal method or timing for nitrogen application... The trials suggest that growers: plant more areas of grain legumes to supply nitrogen in a slower release organic form, which is also less prone to denitrification; match nitrogen inputs with water availability and crop-yield potential; avoid applying nitrogen before significant rainfall events that may lead to waterlogging and denitrification; and consider the overall cost of nitrogen application compared to the return on higher grain-protein prices...
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Catalogue: Ground Cover
"We have measured annual losses of up to 35 kilograms per hectare of nitrous oxide (N 2 O) from around Hamilton... We haven't measured dinitrogen gas losses but, because we're getting these high N 2 O losses, we hypothosise that we might be losing a lot as dinitrogen gas as well.".. "There was a slight response when we applied N at the six-leaf stage, but it wasn't significant...
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Catalogue: Ground Cover
Top-dressing 100kg/ha at green-bud produced about $800/ha of net income - $514/ha more than applying no nitrogen... Applying nitrogen to canola crops at the correct rate, time and growth stage can increase yields and net income and reduce the potential for nitrogen losses, a study in Victoria's high-rainfall zone (HRZ) has found... We haven't measured dinitrogen gas losses but, because we're getting these high N 2 O losses, we hypothosise that we might be losing a lot as dinitrogen gas as well."..
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Catalogue: Ground Cover
"Despite the importance of nitrogen for crop yield and its incidence in the variable costs of farm business, there is no established benchmark to assess the nitrogen status of crops," Dr Sadras explains... Dr Sadras says the direction of the plant breeding industry - breeding for yield - is probably shifting the biomass-nitrogen balance in crops, so agronomic practices, including fertilising, need to be adjusted to capture the potential yield and protein content of new germplasm... "The nitrogen nutrition index is the only method to unequivocally measure the nitrogen status of the crop, and removes much of the uncertainty related to soil and seasonal conditions that are typical of conventional crop diagnostics," Dr Sadras says...
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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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