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phosphorous management

Catalogue: GRDC Updates
Including a legume pulse manure phase as well as a pulse in my continuous crop system is the plan for the future to provide 'home grown' organic nitrogen... The right pulse selection will provide a cash return as well as benefiting future crops... A pulse manure has many benefits and will add robustness and more balance to Neil's system as a manure phase mimics a pasture in that it can produce up to 200 kg/N/ha, providing background nitrogen for about 2 cereal crops as well as opportunities for IWM and a moisture conserving fallow...
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Catalogue: GRDC Updates
Timely application of N can improve yield and protein of a wheat crop (Hill 2005)... The use of precision sowing to plant into the ridge of the previous season will influence crop behaviour... It is suspected that the application of results from this trial may be limited to the deep sandy earth sand plain soils in the medium rainfall zone...
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Catalogue: GRDC Updates
Background Many farmers in southern NSW, particularly younger ones, have switched from traditional mixed farming to a more intensive farming systems involving no livestock at all... Farm data from properties which have adopted brown manure peas, have shown 25 - 30% yield increases for both canola and wheat crops grown in the two years following brown manure pea crops... The trading results measured by EBIT (Earnings before Interest and Tax) and three key financial ratios are shown in Table 3...
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Catalogue: GRDC Updates
In a trial at Trangie Agricultural Research Centre over two seasons (2011 and 2012) the grain yield and grain protein concentration of EGA Gregory wheat following chickpeas was similar to wheat following canola that was fertilised with 46 kg/ha N. The application of 46 kg/ha N in June 2012 to the wheat significantly increased the 2012 wheat yield by 400 kg/ha and 1.4 % protein regardless of previous crop (Figure 2)... For dry matter measured at maturity (GS99), there was a significant increase for the 25 kg/ha N rate compared with the nil rate, with no further increase in dry matter from increased N applications above 25 kg N/ha... At Coonamble, grain yield of eight wheat varieties was maximised at a grain protein concentration of 9 % (Figure 5a), with 100 kg/ha N required to raise grain protein by 2 % but also reduce yield by 250 kg/ha...
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Catalogue: GRDC Updates
The loss to the wheat industry from these two nematode species has been estimated at $AU47 million/year for the northern region and $123 million for all Australia, based on average wheat production and price of $AUD239/tonne over a 10-year period to 2008 (Murray and Brennan 2010)... In order to obtain better sources of resistance to P. thornei we have screened two collections of wheat landraces from that area... We have also found resistance to P. thornei in a collection of wheat landraces made in in the early 1930's (Sheedy and Thompson 2009)...
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Catalogue: GRDC Updates
Declining soil organic matter is resulting in declining organic reserves of nitrogen (N) and sulfur (S), while nutrient removal has also depleted the soil minerals providing slow release reserves of phosphorus (P) as well as K. In most situations we have a reasonable ability to assess and meet N demand, but P inputs continue to be at rates << the rate of removal in grain while K and S inputs are non-existent... At both sites, yields were ~800kg/ha higher when K (Warra) or S (Brookstead) was added in addition to extra P. These responses were quite substantial (16% - 26% increases over adding P alone), and compared to the commercial practice at Brookstead, addressing the combined P and K limitations raised yield potentials by ~50%... The sites will be monitored over coming seasons, and are part of a network of trials across northern NSW and southern and central Qld assessing the responses to addressing multiple nutrient limitations, in addition to examining the most appropriate application strategies for the different nutrients...
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Catalogue: GRDC Updates
S requirements should be locally assessed on a paddock to paddock basis; consider fertiliser history, cropping rotation, product removal and soil test data... Overall, N was the key nutrient driving early growth responses at all sites (Table 3) in 2012, and the N balance was more important than S. Similar yields were achieved from applying N as Urea alone, as SoA, or as a Urea and gypsum combination (Figure 1) at all sites, except at Lameroo where an additional response to combined N and S was found... The response is not uncommon in Mallee farming systems, as DAP/MAP will supply a proportion of the N requirement, and the ongoing crop demand for N can be assessed throughout the growing season to better match seasonal conditions (soil moisture) with N supply...
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