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soil microbe

Catalogue: GRDC Updates
Agricultural soils have lost approximately half (~ 50 t/ha) of their organic carbon since the industrial revolution, a loss that has greatly contributed to soil degradation... We have shown, in experiments with wheaten straw incubated in a variety of soils, that the conversion of the straw into humus (which is much richer in N, P and S than are crop residues) is increased three to tenfold by augmenting the residues with supplementary nutrients according to the established ratios... We hypothesised that adding some extra nutrients (N, P and S) would lead to more microbes being formed than without the extra nutrients and that this would lead to faster stubble decomposition and more plant-C being transformed into humus-C because, we believe, humus is largely dead microbes not dead plant material...
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Catalogue: Nuffield Scholar Reports
The aim of my studies was to investigate how family farms are surviving in marginal areas and see what research is being done to improve their situations... In our semi-arid environment I believe that cover crops would work to improve the soil by shading and cooling it... Throughout my travels in east Europe, Slovakia, Hungary and Serbia the usual succession practice has been to split the farm up between all children equally...
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Catalogue: Ground Cover
Dr Dale Shaner from the US Department of Agriculture explored the implications of the accelerated breakdown of triazine herbicides for Australian growers at the GRDC Grains Research Update for Advisers in Goondiwindi, Queensland... PHOTO: Clarisa Collis Faster breakdown of triazine or Group C herbicides, and its implications for growers around the world, was a central subject at the recent GRDC Grains Research Update in Goondiwindi, Queensland... Keynote speaker Dr Dale Shaner, from the US Department of Agriculture, said it was a global phenomenon and Australian grain growers may also need to rethink their conventional use of triazine herbicides for long-lasting weed control...
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Catalogue: GRDC Media
Australian and international scientists will gather in Fremantle later this year to present research findings on soilborne diseases... The 7th Australasian Soilborne Diseases Symposium will be held at The University of Notre Dame from September 17 to 20... Organising committee convenor and DAFWA senior scientist Bill MacLeod said keynote and invited papers would be presented on topics vital to improving soil health and reducing crop losses from soilborne diseases...
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Catalogue: Ground Cover
Recent research has found that plants react defensively to both classes of microbes, raising new questions about conventional approaches to managing soil microbes for crop health... Researchers such as Canadian-born Dr Jonathan Plett have established that even beneficial rhizobial microbes that form root nodules and provide plant with nitrogen are actually acting a lot like plant diseases... "Rhizobia are able to fool the plant to some degree, taking over control of some biological functions so the plant can't fight off the invading microbes," Dr Plett says...
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Catalogue: Ground Cover
When the timeliness of operation is considered, the reduced compaction of the soil, the increased groundcover that is maintained, the reduction in erosion, the increased biological activity and the associated increased soil structure, then minimum tillage fallows are a good option... It is also starting to show that the higher costs associated with no-till systems is more than offset by improved yields and that the sandy soils should be treated differently to the loamy soils, that is, those soils with more than 10 percent clay content... "Ploughing-in the stubble creates nitrogen early in the fallow in sandy soils, but most of it is leached below the root zone by the time you sow the crop in average to above average rainfall years," says Dr John Leys, a senior soil research scientist with the Department of Infrastructure, Planning and Natural Resources in NSW, and who is working with the MSFP...
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Catalogue: GRDC Publications
Soil organic matter contributes to a range of biological, chemical and physical properties of soil and is essential for soil health... Soils rarely reach their theoretical potential for organic matter storage (see Figure 1.7)... In soils with low clay content the amount of humus and resistant soil organic matter is increasingly important to nutrient exchange because its large surface area gathers (adsorbs) cations from the soil solution, holding nutrients that would otherwise leach...
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Catalogue: GRDC Updates (North)
Precision row placement is likely to have its greatest impact on reducing CR and CRR levels in a no-till farming system with the adoption of GPS guided controlled traffic likely to further benefit this approach... Its main impact on crop productivity has been shown to occur through the disruption of the plants ability to use water efficiently to produce grain (Figure 6)... Plant early in areas of low frost risk, such as higher slopes, and reduce the risk of frost damage by planting more than one variety and by varying planting times...
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Catalogue: GRDC Updates (South)
Precision row placement is likely to have its greatest impact on reducing CR and CRR levels in a no-till farming system with the adoption of GPS guided controlled traffic likely to further benefit this approach... Its main impact on crop productivity has been shown to occur through the disruption of the plants ability to use water efficiently to produce grain (Figure 6)... Plant early in areas of low frost risk, such as higher slopes, and reduce the risk of frost damage by planting more than one variety and by varying planting times...
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Catalogue: GRDC Updates (North)
Coolah Grains Research Update Soils, salinity and the future!.. In summary controlled traffic and conservation tillage will assist in protecting the surface of the soil and will maximise the activity of soil animals, increasing the infiltration and the water holding capacity of the soil... Grains Research Update - Coolah August 2002 any person acting or relying on any data, information, opinion or advice expressed or implied in this document...
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