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Catalogue: GRDC Updates
Studies in Europe have shown that air induction nozzles giving a relatively small droplet size distribution pose less risk to efficacy with many plant protection products... Wind will deflect detrained spray droplets out of the treated area and increasing wind speed will increase the risk of drift... Pure solutions with a surfactant extend the break up distance from the nozzle, produce a finer spray and can increase the risk of drift by more than a factor of two...
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Catalogue: GRDC Final Reports
The model is limited in its application for sprays applied with ground rigs in Australia because it does not include newer nozzle types or drift reduction technologies... Vertical flux measured at a distance of 2m downwind of the sprayed area shows greater than 90% reduction when the shield was used... The present report describes a project which was conducted to offer options for the use of coarser sprays as part of an interim ground drift model...
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Catalogue: GRDC Media
A new GRDC fact sheet, Spray height control, details how the feature can be used safely to maintain the spray nozzle at the correct height above the target area without risking spray drift... Auto boom height can help to maintain correct nozzle height above the target, which improves the evenness of the spray deposit and reduces spray drift through excessive boom height... Operators should have realistic expectations of how an auto boom height system will perform...
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Catalogue: Ground Cover
Wind-tunnel research tests spraying rules.. Testing a new low-drift formulation in the wind tunnel has helped a US chemical company secure a five-fold reduction in the buffer zone for its product.. The tunnel lets researchers control and manipulate the factors that influence spray drift and effectiveness, such as weather, wind speed and direction, nozzle size, atmospheric stability, tank mix, boom height, boom stability and Delta T (how temperature and humidity affect evaporation)...
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Catalogue: Ground Cover
Wind-tunnel research tests spraying rules.. Testing a new low-drift formulation in the wind tunnel has helped a US chemical company secure a five-fold reduction in the buffer zone for its product.. The tunnel lets researchers control and manipulate the factors that influence spray drift and effectiveness, such as weather, wind speed and direction, nozzle size, atmospheric stability, tank mix, boom height, boom stability and Delta T (how temperature and humidity affect evaporation)...
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Catalogue: Ground Cover
Image of test paper showing spray droplets.. The Australian Pesticides and Veterinary Medicines Authority (APVMA) is preparing a discussion paper to launch the review and is planning a series of meetings around the country... NWPPA was established to consider the potential outcomes of policy changes and spray drift reviews being undertaken by the APVMA. Its executive committee includes representatives from grower groups, spray manufacturers, spray applicators and R&D corporations across viticulture, horticulture and broadacre agriculture, and it is coordinated through Plant Health Australia...
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Catalogue: Ground Cover
Image of test paper showing spray droplets.. The Australian Pesticides and Veterinary Medicines Authority (APVMA) is preparing a discussion paper to launch the review and is planning a series of meetings around the country... NWPPA was established to consider the potential outcomes of policy changes and spray drift reviews being undertaken by the APVMA. Its executive committee includes representatives from grower groups, spray manufacturers, spray applicators and R&D corporations across viticulture, horticulture and broadacre agriculture, and it is coordinated through Plant Health Australia...
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Catalogue: Ground Cover
Spraying specialist Bill Gordon looks at the issues governing effective spray operations - By Bill Gordon.. The key to a good outcome from any spraying operation is being well prepared, knowing how you want to do the job and executing the spray the way you planned it... Plan your spraying operations well before they are needed and have the gear ready to go: correct nozzles, pump and plumbing free of leaks, machine calibrated and controller settings considered...
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Catalogue: GRDC Media
Northern region grain growers are being urged to get on top of summer weeds early in fallow paddocks in order to minimise nutrient and moisture loss and increase the yield potential of next season's winter crops... New research has shown that coarser droplet size can be more effective in controlling weeds in summer fallow situations, and can reduce the risk of spray drift... "If spraying to conserve soil moisture and retain nutrients over summer, early weed fallow control can increase the yield potential of future crops," GRDC Northern Panel Chair James Clark said...
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Catalogue: GRDC Updates (West)
Controlling leaf spot diseases - yellow spot and stagonospora (septoria) nodorum - in wheat-onwheat cropping 1... Early spraying can reduce le;af spot diseases when susceptible varieties are sow; n on wheat stubble.. Where early disease is severe and developing rapidly on susceptible variety & seasonal conditions favour disease development Application at tillering or stem extension delays disease development and increases yield Z31 application most reliable timing for profitability May need additional application at flag leaf emergence..
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