GRDC Stubble Project

Controlling Weeds in Wheel Tracks

Poor weed control within the wheel tracks of the sprayer can be caused by a number of factors. #1 Physical Stress: The physical damage caused to the weed by the wheel pressing down upon it may lead to poorer uptake and translocation of some products. #2 Poor Deposition: When air is displaced from the sprayer moving forward its possible that...
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The Risk of Summer Inversions

The most effective strategy for conserving moisture during the summer fallow period is by effectively controlling summer weeds. Although there may be some key issues that you will encounter when applying chemicals during this period. Surface Temperature Inversions In cool night conditions airborne chemicals concentrate near the surface and winds can move the droplets away from the target. During the...
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Maximising Spray Results in Stubbles

Nozzle Setup: Aiming to get a double overlap occurring with your spray nozzle output. Should be set up at a 50 cm spacing with a 10 degree fan angle When stubble is introduced into the system the stubble provides a false floor. This leads to the spray jet overlap occurring within the stubbles canopy. This minimises the degree of contact...
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NSW DPI Stubble Grazing efficiency

Stubble efficiency – Stubble GrazingCondobolin 2015 Key points Treatment 1, Nil grazed, moderate stubble yielded the highest, (2.18 t/ha).No significant difference in Total Plant Available Water, the majority of stored water was below the 50 cm depth.There was a significant difference between the eight treatments when comparing available soil nitrogen.There was a significant difference in grain quality attributes between the...
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Impact of Windrow Burning on Mice Populations

Windrow burning is commonly used for the control of weeds in retained stubble systems. By removing the spinners from the rear of the header the stubble, trash and weed seeds are directed into a narrow windrow. From here the farmer can elect to burn the stubble thus destroying the weed seeds in the process. The windrows are usually burnt in...
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Crop Rotations (2014)

The Merriwagga tillage and rotational trial was established in the year of 1999. The trial aimed to compare no till farming techniques against conventional farming methods over, wait for it a whopping five different crop rotations. The trial is currently managed by Agrow agronomy in a partnership with central west farming systems. In the past the trial site has been...
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The Use of Cover Crops in NSW

In  2009, 95 farmers in the mixed cropping zone of NSW were surveyed in relation to their use of pasture species with perennial pastures being a key focus. The survey found that 52% of the land was under crop, 29% contained perennial pasture and 19 % contained annual pastures. Stemming on from the survey was a series of large scale...
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Good Stubble or Bad Stubble Loads

Background Stubble retained systems has began to become common practice throughout the central western area. This has lead to the focus of current research being directed towards maintaining the profitability and environmental sustainability of retained stubble systems. The major agronomic drivers for the adoption of stubble retained farming systems has been minimising the risk of soil erosion as well as...
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Fallow Periods

Fallow periods and green manures are usually used by farmers to conserve moisture, mineralise and produce nitrogen as well as to control weeds. So its to no great surprise that a well managed fallow period can have significant impacts on yield. Key Points:  Long fallows and green manure crops are valuable managment tools that increase soil moisture and nutrition for...
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