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inversion condition

Catalogue: GRDC Updates
Spraying when inversions exist and recent changes in operating practices are likely the cause of observed changes in patterns of damage witnessed in recent times... Uniform spray drift over large areas points to multiple spray applications injecting small droplets into the air which drift as one when inversions exist... The following illustration highlights possible wind flow and transport/deposition of airborne pesticides while inversions exist...
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Catalogue: GRDC Updates
GRDC is supporting research to better understand inversion conditions and to provide resources to anticipate and recognize inversion conditions... Temperature inversions suppress vertical motion of the atmosphere and thereby cause concentration rather than dispersion of pesticide droplets, vapour or particulate matter that remain airborne after application... The risk of spraying when inversions exist There is real potential for small droplets, vapour and particulate matter to drift for long distances at high enough concentrations to contaminate and damage sensitive crops and the environment...
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Catalogue: GRDC Updates
Maximising spray efficiency: The tactics to optimise results.. Spray operators need to be able to identify weather conditions associated with inversions... Technology has thrown up a series of challenges that require an improvement in the observation skills of advisers...
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Catalogue: GRDC Updates
Craig Day Spray Safe & Save Pty Ltd.. Spray operators need to be able to identify weather conditions associated with inversions... Inversion layer 2: chemical concentrating at base of inversion (photo courtesy DPI Victoria) Inversion layers burn off as the earth's surface is heated by the sun...
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Catalogue: GRDC 2014 Research Summaries
For many pesticides it is an APVMA mandatory requirement not to spray when inversions exist... There is clearly a need for improved inversion risk management systems.A pilot scoping study has been proposed to test the feasibility of robust and economically viable instrumentation and high-resolution modeling to detect and predict surface inversions and to quantify conditions (such as drainage wind occurrence) within inversions that affect the transport and dispersion of airborne pesticides for specific locations... It is anticipated that results of the scoping study will lead to:Decreased incidents of spray drift due to a better understanding and awareness by growers and the general community about the micro-climate variables related to inversions.A code of practice to assist grower decisions evolving from the information gathered from the analysis of instrumented towers and from the modeling; a code similar to the harvesting codes where a family of variable conditions determines risk and acceptable practices...
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Catalogue: GRDC Updates (South)
Gross margins achieved on-farm for wheat in 2011 may have been lower than shown in Table 2... The gross margin calculations depicted in Figure 5 assumed that canola yielded 50 % of wheat at that site in that year... In comparing while many farm decisions are made intuitive versus logical analytical under the influence of a DSS which provide learning reasoning he suggests the either/or approach to on a topic, they are not necessarily used every time the dichotomies is destructive and goes on to say a decision is made...
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Catalogue: GRDC Updates (South)
Gross margins achieved on-farm for wheat in 2011 may have been lower than shown in Table 2... The gross margin calculations depicted in Figure 5 assumed that canola yielded 50 % of wheat at that site in that year... In comparing while many farm decisions are made intuitive versus logical analytical under the influence of a DSS which provide learning reasoning he suggests the either/or approach to on a topic, they are not necessarily used every time the dichotomies is destructive and goes on to say a decision is made...
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