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root system

Catalogue: Ground Cover
Window opened on root behaviour.. The relentless pursuit of knowledge that can lift crop performance has turned to root behaviour using fascinating technology that allows researchers to see what is happening within the soil.. Inside each of the 24 silos, a core of soil is intersected by several tiny transparent tubes, each fitted with sensors and cameras recording in intimate detail the behaviour of roots and water as crops grow - information that would usually be concealed from view...
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Catalogue: GRDC YouTube channel
" GCTV9: Banding Fungicide in Cereals 17 December 2012 Field trials show the placement of fungicide above and below the seed as cereal crops are sown improves the level of protection against Rhizoctonia... 34.2: Alan McKay: Principal Scientist SARDI This particular plot we have barley and the 40.93: three rows of this side have had the fungicide applied deep banded below the seed... The plant has a seed treatment, which is the current 288.96: practice for people trying to use fungicides to protect plants from Rhizoctonia, so the 293.59: seminal root system is not too bad but we 299.599: we 306.199: good protection of the seminal roots and we 310.289: So it looks like we 315.449: help support some banding recommendations for these new fungicides...
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Catalogue: Ground Cover
Window opened on root behaviour.. Inside each of the 24 silos, a core of soil is intersected by several tiny transparent tubes, each fitted with sensors and cameras recording in intimate detail the behaviour of roots and water as crops grow - information that would usually be concealed from view... A history of lucerne in a dry year is probably beneficial to subsequent crops but hydrologically less favourable in wet years," Dr Eberbach says...
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Catalogue: GRDC Publications
" GRDC Grains Research Update Goondiwindi, March 2014 General plenary day 2.. Overall, both models are acceptable for modelling soil evaporation over a range of soils and seasons provided accurate soil physical properties and starting water states are known... Only some of the mutations provide resistance to both groups of herbicides...
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Catalogue: GRDC Updates
Maximising the nitrogen (N) benefits of rhizobial inoculation.. Inoculation of legumes with rhizobia can deliver substantial N inputs to southern farming systems even when the impact on legume yield is small... Inoculation of legumes with rhizobia is a standard practice...
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Catalogue: GRDC Updates
Root proliferation in response to S fertiliser is questionable and requires more research... We are using young seedlings to screen because a) they fit in the scanner (!) and b) early responses to banded nutrients by seedlings are easily measured at this stage... Interestingly we did observe an increase in root proliferation in the band of S; this was accompanied by increased P uptake and the result suggests that the form in which we applied S (i.e. gypsum) increased the availability of P. Further work is currently being undertaken to confirm this, and to set up experimental conditions that will allow us to apply banded S so that the S remains available, whilst not increasing P availability in the soil...
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Catalogue: GRDC Updates
The structure of roots is a consequence of their primary functions- growing through an abrasive medium (the soil), acting as plumbing to absorb and transport water to the shoot, and actively and selectively absorbing essential nutrients such as mineral N (nitrate and ammonium), inorganic P and K. the structure of leaves is designed to absorb radiation for photosynthesis, regulate evaporative losses of water, act as a sink for nutrients and water transported from the root system, and produce carbohydrates from photosynthesis... The root surface comprises a layer of epidermal ('skin') cells (some with extensions or 'root hairs') that absorb water through their cell walls and cell membranes and which have specific sites where nutrient forms such as nitrate, ammonium, phosphate and potassium are bound onto 'carrier' molecules and transported across the cell membrane into the interior of the cell... Any so-called microbial activators or mineral-solubilising microorganisms are operating in a hostile environment full of competitors...
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Catalogue: Ground Cover
Legume nitrogen fixing may be clue to drought tolerance.. Much of his research for the past 20 years has focused on understanding at a molecular level how a legume and a rhizobium go from being a plant and bacterium in the soil, independent of each other, to establishing an intimate, symbiotic relationship; and the implications of this relationship... The bacterium delivers a small molecule to the plant that the plant perceives in a very specific way...
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Catalogue: GRDC Updates
One proposal is that supplying a concentrated source of P allows the root system to forage more widely and exploit a greater volume of soil, and a greater amount of P may be available to generate biomass, and ultimately yield... Observing real root behaviour, examining root length, density and proliferation and converting that to C allocated allows us to understand whether we can use both our applied P investments more effectively, and create root architecture that is more profitable... We are currently using micro-CT scanning to monitor cereal root behaviour in response to patches of P. These techniques involve growing cereals in small columns that are able to be easily scanned, and reconstructing the root systems of these cereals in 3D to allow root responses to be observed as they develop...
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Catalogue: GRDC Final Reports
ROOTMAP can be used to improve the strength of an experimental design by simulating the effect of different seasons on an experiment; identifying treatments most likely to provide the range of results needed; identifying the number of replications required to produce stable results; investigating the relationship between root growth in a glasshouse study and in the field; and extending the design to test other treatments that might be relevant to the hypothesis... ROOTMAP can also be used to extend research findings beyond pot boundaries and beyond the 2D measurement method used... To date, the use of ROOTMAP has been largely restricted to the creators and developers of the model and close collaborators because of the level of programming and modelling skills required to run it...
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