Technical annual report 2000-01
Dept. of Regional Development, Primary Industry, Fisheries and Resources technical annual report; Department of Regional Development, Primary Industry, Fisheries and Resources technical and annual report; Reports; PublicationNT; Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Agriculture -- Northern Territory -- Periodicals; Fisheries -- Northern Territory -- Periodicals
Dept. of Primary Industry and Fisheries
Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295
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Department of Primary Industry and Fisheries 46 PROJECT: Systems Research Project Officer: P. Shotton Location: Douglas Daly Research Farm Objective: To trial, monitor and record the short and long term effectiveness of weed control methods in pastures using herbicide rolling and slashing techniques. Background: The control of grass and broad leaf weeds in pastures is an ongoing concern, particularly where selective herbicides are not available or are uneconomical. With the use of selective herbicides, various grasses and broad leaf weed species can be controlled in pure stands. However, the control of weeds in mixed pastures (such as grass weeds in grass pastures and various broad leaf weeds in legume pastures) is more difficult with few selective herbicides currently available at reasonable prices. Herbicide wipers are one method being used for managing taller weeds in crops and pastures world-wide with varying success depending on location, weed species, application methods and chemicals used. The benefit of herbicide rollers is that the chemical is only applied to the target weed so wastage is minimal and spray drift is eliminated. Mechanical means for weed management, such as slashing, is a commonly used practice to reduce plant biomass and damage the plants to reduce competition, whilst also reducing weed seed production. The effectiveness of using mechanical methods (slashing) on different weed species at different stages of plant growth and the reduction of weed species will be monitored over time. Different chemicals, surfactants, application rates and timing of application will be trialled using a herbicide roller and its effectiveness on a wide range of broad leaf and grass weeds will be monitored. The effectiveness of both methods will be evaluated using botanical surveys to determine weed reduction and other changes in the areas over time. Method: A replicated herbicide wiping trial was conducted at DDRF in February 2001 using three different chemicals and two surfactants on Sida (Sida acuta), Flannel weed (Sida cordifolia), Hyptis (Hyptis sauveolens), Gooseberry (Physalis minima), Sickle pod (Senna obtusifolia) and Pennisetum (Pennisetum pedicellatum). Treatments: 1. Glyphosate @ 3 L/ha with LI700 surfactant 2. Glyphosate @ 3 L/ha with Uptake wetter 3. Glyphosate @ 2 L/ha with LI700 surfactant 4. Glyphosate @ 2 L/ha with Uptake wetter 5. Brush Off @ 20 g/ha with LI700 surfactant 6. Brush Off @ 20 g/ha with Uptake wetter 7. Brush Off @ 30 g/ha with LI700 surfactant 8. Brush Off @ 30 g/ha with Uptake wetter 9. Glyphosate @ 3 L/ha and Brush Off @ 20 g/ha with LI700 surfactant 10. Glyphosate @ 2 L/ha and Brush Off @ 30 g/ha with Uptake wetter 11. Tordon 75D @ 1 L/ha 12. Control No chemical applied Note: Application rate is only approximate.