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Catalogue: GRDC Updates
Table 1: Effect of group B herbicides at recommended and greater than recommended rates on grain yield, plant density, dry matter at maturity and visual plant damage of two lentil varieties at two sites in SA, 2011... PBA HeraldXT (tested as CIPAL0702) has improved tolerance to the herbicide flumetsulam (e.g. Broadstrike , Multitude ), plus reduced sensitivity to some sulfonylurea and imidazolinone herbicide residues... Preliminary results have shown there was no effect of crop top timing on the incidence of mould in lentil in chickpeas high levels of mould were detected in the early crop topping treatment compared to all other treatments regardless of variety used (Table 2)...
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Catalogue: Ground Cover
A NEW web-based guide on soil nutrients, Fertiliser after the Drought , can give cash-strapped farmers practical advice on how to cut drought recovery times... "To underestimate existing nitrogen levels can lead to growers sowing an inappropriate crop - a potentially critical mistake for farms recovering from drought.".. For example, calculations of nitrogen need to include residual nitrogen from fertiliser applied in 2002, subsoil and topsoil nitrogen mineralisation - which can be accelerated after a drought - and nitrogen removed in 2002 crops," Dr Angus says...
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Catalogue: GRDC Media
New Grains Research and Development Corporation (GRDC) research questions the value of fungicidal treatment of yellow spot in susceptible wheat, showing a maximum of just $1.50 profit gained for every one dollar spent... Richard Daniel, chief executive officer of the GRDC-funded Northern Grower Alliance (NGA) says results from 2011 research on EGA Gregory shows single applications of full registered rates of all fungicides evaluated reduced yellow spot severity by up to 50 per cent on the top three leaves... "Multiple fungicide applications did improve disease suppression to the tune of about 70pc reduction on the top three leaves but at the rates tested, there were no clear or consistent differences in disease suppression between the fungicides evaluated."..
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Catalogue: GRDC Research Summaries
Soil testing the key to fertiliser strategy.. Northern region grain growers are being urged to test for subsoil phosphorus (P) in order to identify opportunities to bolster long-term yields through deep placement of P fertiliser... Deep soil testing to 40 centimetres or below across Western Australia's agricultural regions has revealed there is more nitrogen in the subsoil that can be accessed by crops than previously realised...
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Catalogue: GRDC Media
The root lesion nematode Pratylenchus neglectus has a more restricted distribution, detected in 38pc of paddocks and at populations representing a risk of yield loss in intolerant varieties in only five pc of the random paddocks surveyed... The fungal root pathogen Pythium was detected in 67pc of paddocks but was at low levels which presented a risk of yield loss in less than two pc of paddocks... "Growers need to be aware of the extent of risk present from various pathogens and to plan rotations " Dr Simpfendorfer said...
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Catalogue: GRDC Final Reports
Factors affecting the decline in inoculum with time were identified... The quantity of inoculum produced in a wheat crop can be estimated by multiplying the yield by the proportion of mature plants showing stem browning... The expected outcome is increased yields of wheat, durum and barley in the Northern Region (NR) through improved management of CR. Being able to define more precisely when management for CR is required will assist growers to avoid crop losses when risk is high, and to avoid unnecessary management expenses when risk is low...
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Catalogue: GRDC Final Reports
These included control of the causal organisms with the biological control agent the twist fungus ( Dilophospora alopecuri ), reduction of the contamination of harvested grain by Rathayibacter toxicus, the toxigenic bacteria that causes ARGT, and the collection of evidence that exotic non-toxigenic Rathayibacter spp ... With respect to the effectiveness of the twist fungus to reduce the risk of ARGT in livestock in WA and SA and reduce the levels of R.toxicus contamination of harvested grain, the project identified that this organism will take longer than the originally anticipated five years to start having an impact on the prevalence of the ARGT causal organisms... Further research is needed to determine if spray-topping of ryegrass pastures has an adverse effect on the establishment and persistence of the twist fungus...
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Catalogue: GRDC Updates
Disease data was assessed at each application timing and finally ~3-4 weeks after the T3 application... Figure 2 shows the performance of the range of fungicide treatments when applied at T2 (GS32-33) on disease levels assessed at GS75-83 (milk to soft dough)... The very early T1 application (~GS15) provided useful initial disease suppression but had negligible impact on the final disease levels assessed at the late milk to early dough stages...
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