The performance of Avadex Xtra and TriflurX , like all pesticides is influenced by environmental and paddock specific situations. Key factors that can influence TriflurX performance are soil type and soil moisture, climatic conditions, volatility & incorporation timing, tillage system, weed density, stubble residues and organic matter levels. Understanding these factors can allow growers to maximise the results from their pre emergent strategies.
Application rates and incorporation time of systems
Incorporation/tillage - what system are you in?
In many ways the success of Avadex Xtra and TriflurX is driven as much by the tillage system and its characteristics as the chemistry itself. Understanding your system and where the crop seed and chemical are placed is a fundamental principal to maximise results.
An effective tillage system that allows good crop establishment and crop competition will assist all herbicides, including Avadex Xtra and TriflurX.
Volatility and incorporation timing
TriflurX can be applied between six weeks and just before planting takes place, although it must be remembered that the product (depending on conditions) can begin to breakdown as soon as it is applied. Application closer to planting will ensure the longest period of control in the crop and the most efficient use of TriflurX.
TriflurX is a volatile chemistry that requires incorporation into the soil to prevent herbicide loss and ensure adequate weed control levels are maintained.
The level of volatile loss of TriflurX is influenced by soil moisture, soil and air temperature and wind conditions. Under moist soil, warm temperatures and windy conditions volatile losses will be increased. Correspondingly under drier soil conditions, lower temperatures and no wind volatile loss will be less.
In Conventional tillage systems incorporation should occur within 4 hours of application to ensure reduced volatile loss.
In Zero/No-till sowing systems incorporation should occur with sowing within 24 hours of product application.
Soil type can also influence the efficacy of Avadex Xtra and TriflurX.
Clodding soil types can affect performance by not allowing adequate incorporation or by allowing untreated areas to remain in the soil where weeds remain unaffected.
Soil type will also affect the level of soil throw and corresponding level of incorporation.
Soil types that crust or heavy clay soils that amplify wheel track affects may affect crop germination.
Dry or non-wetting soils that delay weed germination can reduce herbicide affects.
Where are your weed seeds?
Speed of travel and soil type
The knife-point and press wheel system relies heavily upon the separation of the crop seed in the furrow from the chemically-treated soil in the enter-row or area between the furrows. As a
result anything that compromises this compromises the success
of the system. Speed of travel and the subsequent level of soil
throw from tillage equipment is therefore a very important factor.
If the planting speed is too quick or the soil type is such that soil is thrown into the planting furrows, the benefits of the system are lost. If soil is thrown into the planting furrows, seeding depth will be
dramatically increased as the furrow will be filled or partly filled with additional soil and the chemical separation of the crop and herbicide will be lost.
It is important to recognise that soil type, soil moisture, speed of travel and tyne spacing will all interact and will vary from one paddock to the next. Therefore growers should always monitor planting speed to ensure that soil throw into adjacent seed furrows does not occur.
Stubbles are being retained more and more as farmers recognise the benefits in keeping cover on the paddock, including:
Stop soil blowing away
Create a favourable micro-climate for germinating seedlings
A key benefit of the knife-point system is that growers can plant into higher stubble levels to avoid burning and take advantage of the cover benefits. This 'stubble tie-up' or binding is one of the primary reasons for the higher TriflurX application rates in knife-point systems. As stubble loads increase it is recommended that the rate be moved to the higher application levels to counteract this binding.
As a guide for pre-emergents and knife-points, efficacy will be significantly reduced once more than 40-50% of the ground cannot be seen. When using the knife-point system growers should always consider stubble management and the impact that this will have in their system.
For instance, grazed stubble or stubble that has been knocked down will intercept and bind more herbicide than stubble that remains standing, as it will cover a greater percentage of ground area. If practicing stubble retention, planning how to minimise its impact on planting equipment ideally begins well before harvest of the previous crop.