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suppressive soil

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Catalogue: GRDC Final Reports
PEM bacteria are important as they are common, suppress multiple diseases, interact with other organisms to increase suppression and can be correlated with reduced disease in the field... Crop selection could be used to increase suppressive microbes and enhance disease suppression on-farm... In summary, the project increased our understanding of disease suppression and the organisms involved, identified potential biocontrol inoculants that can reduce disease in the field as seed coatings to provide in-season Rhizoctonia disease control, and identified a potential strategy using crop selection to increase naturally occurring disease suppression in the field to provide long-term control of soilborne fungal diseases...
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Catalogue: GRDC Research Summaries
There has been a considerable increase in the incidence of crops affected by root lesion nematode (RLN) throughout the Western Australian (WA) cropping region... The recent root disease survey showed that the highest levels of all root diseases in WA are in the southern high rainfall zone... The objectives of the project are to:1) Identify sites in WA that are suppressive to one or more root diseases of wheat including take-all, rhizoctonia root rot, crown rot and RLN. Sites will be selected from three past and current projects including the DAFWA "Profitable crop sequencing in WA" [P. WHITE, M. HARRIES] project (which will establish 150 focus sites at which inoculum level and disease incidence will be measured), the "Soil Quality" [D. MURPHY] project (which has previously established a large number of geo-referenced monitoring sites around the WA agricultural region and the inoculum level was measured), and the DAFWA 2006-2008 cereal root disease survey sites [DAW00159]...
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Catalogue: GRDC Research Summaries
There has been a considerable increase in the incidence of crops affected by root lesion nematode (RLN) throughout the Western Australian (WA) cropping region... The recent root disease survey showed that the highest levels of all root diseases in WA are in the southern high rainfall zone... The objectives of the project are to:1) Identify sites in WA that are suppressive to one or more root diseases of wheat including take-all, rhizoctonia root rot, crown rot and RLN. Sites will be selected from three past and current projects including the DAFWA "Profitable crop sequencing in WA" [P. WHITE, M. HARRIES] project (which will establish 150 focus sites at which inoculum level and disease incidence will be measured), the "Soil Quality" [D. MURPHY] project (which has previously established a large number of geo-referenced monitoring sites around the WA agricultural region and the inoculum level was measured), and the DAFWA 2006-2008 cereal root disease survey sites [DAW00159]...
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Catalogue: GRDC Publications
Soil microrganisms also impact on the physical properties of soils including their capacity to hold water... An on-going output will be the coordination of review workshops and reporting processes to ensure that adequate resourcing, integration and consistency measures are being applied across all projects and new opportunities are identified... The major foci of this project are to screen and identify elite diseasesuppressive microbes for cereals and nodulation enhancing beneficial microbes for legumes...
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Catalogue: GRDC Research Summaries
We propose to use a polyphasic approach involving (i) comparative analysis of high- and low-suppressive soils, (ii) pre-treatment or prior exposure of soils to factors that have been attributed to the development of disease suppression and (iii) amplification of target regions prior to high-throughput sequencing... The use of direct soil DNA/RNA extraction technologies will help overcome the bottlenecks associated with the culture based methods... We propose to establish close working links with other projects in SBI-Theme 3 for field sites used, consistency in methodologies and complementary research approaches...
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Catalogue: GRDC Publications
The GRDC Soil Biology Initiative (SBI-II, 2009-2014) has partnered with research organisations throughout Australia to work towards the 10-year vision of increased profitability and sustainability of grain cropping as a result of harnessing the biological potential of soil... Timing of N fertiliser additions: Minimising or eliminating fertiliser applications at sowing will enhance microbial processing of soil organic N. Mineralisation measures: Molecular tools that measure the microbial genes associated with organic N release may be used to assess the mineralisation potential in a wide range of soils... Objectives: The project aimed to determine if populations of AM fungi (AMF) in soil are influenced by growth of different break crops, so influencing AM colonisation in the following wheat crop and delivery of soil phosphate (P) to the plants via the AMF. We use a novel method of estimating this delivery separately from direct P uptake by the roots, using radioactive P ( 33P)...
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Catalogue: Ground Cover
Pursuing the mystery of disease-suppressive soils.. The GRDC is funding a suite of projects to identify and harness the biological traits associated with suppressive soils.. Mechanisms of disease suppression are identified using RNA sequencing technology to examine the genes that are switched on in suppressive and non-suppressive soils prior to sowing and six to eight weeks after sowing, when young plants can be infected by R. solani ...
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Catalogue: Ground Cover
The GRDC is funding a suite of projects to identify and harness the biological traits associated with suppressive soils.. The project is looking to identify the key organisms involved in the suppression of root lesion nematodes and which soils might best support these organisms... Mechanisms of disease suppression are identified using RNA sequencing technology to examine the genes that are switched on in suppressive and non-suppressive soils prior to sowing and six to eight weeks after sowing, when young plants can be infected by R. solani ...
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Catalogue: Ground Cover
Soil secrets to suppress disease.. Associate Professor Pauline Mele from La Trobe University looks for the soil microorganisms that suppress disease in grain crops... A team of 90 researchers working on 15 projects aim to increase yields and reduce input costs in soils across the high-rainfall zone (HRZ) as part of the GRDC's Soil Biology Initiative...
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Catalogue: Ground Cover
Associate Professor Pauline Mele from La Trobe University looks for the soil microorganisms that suppress disease in grain crops... A team of 90 researchers working on 15 projects aim to increase yields and reduce input costs in soils across the high-rainfall zone (HRZ) as part of the GRDC's Soil Biology Initiative... The research into disease suppressive soil focuses on the following areas: the physical, chemical and biological features of disease suppressive soils, and whether they are regionally specific; determining whether disease suppression in soils is a temporal phenomenon and whether it targets specific pathogens' potential development of a disease suppression index based on the genetic signature of a soil community; and management of the crop-soil ecosystem, including the physical and chemical environments, to increase disease suppression...
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