Ground Cover Supplement : GC Supplement - Spray application technology
15 SPRAY APPLICATION TECHNOLOGY GROUND COVER HIGH DRIFT RISK alleviate the effect of dust on weed control in wheel tracks. The project found that the best-bet herbicide strategies identified were as follows: nrobust rates of glyphosate 450 (Group M) (1.5 litres a hectare) for heliotrope control and suppression of paddy melon; nrobust rates of glyphosate 450 (1.5L/ha) with a Group I phenoxy spike and a Group G spike (Goal® or Hammer®) for improved control of marshmallow; and nrobust rates of glyphosate with a Group I triclopyr (Garlon®) as a spike for the control of paddy melon. The main solutions to reduce the effect of dust on spraying were those that optimise weed control: nspray weeds when young and not stressed -- that is, within the first few weeks of a rain event; nspray early in the morning or at night when dust levels are lower; and nuse high water volumes and coarse droplets to ensure good coverage and droplet survival. Maintaining as much ground cover as possible was reported as a method of reducing dust levels. Engineering solutions to reduce dust included using additional nozzles in the vicinity of the wheel tracks to increase chemical loading in these areas, or having a separate spray system in front of the wheels. GRDC Research Code JSA0001 More information: John Stuchbery, John Stuchbery and Associates, 03 5497 1956, email@example.com Drift caution with Roundup Ready crops Growers need to be mindful of off-target drift when applying Roundup Ready® herbicide as highly sensitive cereals could be emerging at the time of application By David Moore ROUNDUP READY® CANOLA allows you to spray Roundup Ready® herbicide over the top (OTT) of your canola in the early stages of growth without affecting the development of the crop. With the introduction of this technology this season, growers need to be particularly mindful of off-target drift when applying their Roundup Ready® herbicide. However, it should be no more of a problem to manage than normally susceptible paddocks in close proximity to a Roundup® spray application. In any farming system, spray drift can be successfully managed with correct knowledge of spray equipment and an understanding of the factors that influence it. Drift can be influenced by droplet size, spray tip height, operating speed, wind velocity, air temperature and humidity. Correct selection of spray- nozzle tips that are designed for the intended application is the first step in reducing off-target drift during spray application of all herbicides and pesticides including Roundup Ready® herbicide. Growers will need to ensure that the droplets produced are of a coarse spray quality to minimise the level of driftable fines and hence the risk of off-target movement. Experience has shown that the use of a fine spray quality in situations of high relative humidity and low temperature conditions can significantly increase the potential for off-target drift damage. Every application is a balance between reducing drift and maintaining effective weed control. Field tests conducted by Nufarm have shown that use of a coarse spray quality with Roundup® has performed at least as well as typical flat- fan nozzles producing a fine spray quality. This finding is supported by Monsanto efficacy studies outlined in the accreditation manual. Both spray qualities provided excellent control of a range of broadleaf weeds and fine-leaf grasses, such as annual ryegrass and silver grass. With the introduction of Roundup Ready® cotton, the need to clearly identify paddocks growing Roundup Ready® plants increased significantly. This assisted contractors and spray operators to clearly identify the proximity of susceptible paddocks. Growers need to ensure that appropriate measures are taken when applying Roundup Ready® herbicide to prevent injury to desirable plants and crops which do not contain the Roundup Ready® technology. It is important to be aware that highly sensitive cereal crops are likely to be emerging at the same time as Roundup Ready® crops. More information: David Moore, Monsanto Australia, 03 9522 7122, david.neil.moore@ monsanto.com; Andrew Wells, Nufarm Australia, 03 9282 1000, firstname.lastname@example.org Roundup Ready® canola can be sprayed with Roundup Ready® herbicide up to the sixth leaf stage, but highly sensitive cereals could be emerging at the time of application, so spray operations must minimise the risk of drift.
GC Supplement - Collaboration
GC Supplement - Grain hygiene