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After participating in a winter barley fungicide trial final season, Cornish grower Mike Hambly has rejigged his spray programme to incorporate Revystar on the T2 timing.
Working alongside agrochemical agency BASF, the trial in contrast Mr Hambly’s farm customary to the corporate’s spray programme, which revealed a 0.54t/ha yield uplift.
The trial was established in various tramlines, evaluating the farm’s regime consisting of Revystar, Siltra Xpro and Proline in opposition to the agrochemical agency’s therapy Priaxor and Revystar and Proline on a crop of Valerie winter barley.
See additionally: How natural matter enhance helped farm hit net-zero goal
Rhynchosporium is the only greatest risk to winter barley crops on the 200ha Westcott farm partnership close to Callington, the place Mr Hambly and his spouse Anne farm arable and beef.
Because of this Mr Hambly believes the T1 timing was crucial winter barley spray for controlling moist climate illnesses, which may be deadly on a farm that receives a median annual rainfall of 1,500mm.
Subsequently, a sturdy programme of premium merchandise was used to attain efficient illness management at this early stage.
“A robust T1 spray is essential in barley – extra so than wheat as it’s sink restricted, which suggests yield is decided earlier in a crop’s progress levels. Because of this we have now been utilizing Revystar,” he says.
Nevertheless, BASF famous the identical energetic performs higher when used on the T2 timing, attributable to its elevated greening advantages that optimise inexperienced leaf space index.
After the earlier farm customary chlorothalonil was prohibited to be used in 2019, Mr Hambly was eager to research tips on how to maximise crop potential by incorporating Revystar into his fungicide programme and so he obtained concerned with a BASF actual outcomes trial.
“We knew that Revystar was a possible contender, nevertheless it was initially prioritised for the wheat market. We needed to make sure that the energetic would work for us on our farm and in that case, discover out what utility timing can be only,” he says.
And so the trial evaluating the 2 spray timings was carried out.
Actual outcomes
At harvest, yield information had been analysed utilizing the Adas agronomics strategy to exclude yields from headlands, wheeling and any potential anomalous outcomes.
The typical measured yield of the farm customary therapy was 8.04 t/ha, whereas the BASF was 8.58t/ha – a statistically vital yield uplift of 0.54 t/ha.
Since participating within the BASF actual outcomes trial final season, Mr Hambly has now switched up his whole fungicide programme within the hope of reaping the rewards of a yield enhance.
“We’ve been concerned with a variety of actual outcomes trials previously, however we have now by no means seen such vital outcomes as these, so we adopted BASF’S fungicide programme throughout all our 42ha winter barley space.”
This season
This season, the 2 winter barley varieties Flynn and Cassia are grown on-farm, utilizing 0.75l/ha of Revystar at T2.
Though the range Valerie was used within the trial final yr, the cultivar proved extra delicate to barley yellow dwarf virus an infection.
Situated within the far South West, Mr Hambly returned to outdated favourites Flynn and Cassia, which seem much less delicate to an infection.
“When it got here to dose price, we did think about a decrease price of 0.5 litres/ha, however we needed to optimise rynchosporium and ramularia management so we determined in opposition to it.
“The robust persistency and kickback of Revystar is effective to us within the moist Cornish local weather and getting the appropriate dose price is necessary. What’s extra, with the worth of grain the place it’s, the returns from utilizing fungicides this season have by no means been higher.”
Crops had been planted on 14 October with a Vaderstad Fast drill into good seed-beds.
This marked the primary yr in three the place all winter crops had been planted in the identical yr that drilling commenced, because of the earlier moist autumns.
Mr Hambly opts for comparatively excessive seed charges, planting at 350 seeds/sq m in an effort to optimise tillering and ears/sq m, the place he goals for greater than 900 ears.
Solely winter-sown crops are grown ont the farm, in a rotation incorporating winter barley, oilseed rape, winter wheat and winter oats.
Winter barley is a key crop on the farm, because it performs an necessary function within the farm’s barley beef cattle fattening enterprise.
Keeping track of cropping manufacturing prices and maximising return on funding is due to this fact essential to a worthwhile enterprise.
Following winter oats with winter barley has lifted barley yields by as much as 1.5t/ha, by means of the availability of an efficient break and eradicating the chance of take-all.
August is statistically one of many wetter months and with all of the straw baled, following winter wheat with oilseed rape can result in delayed drilling.
Winter barley suits in effectively on the farm and gives the early entry wanted to optimise the institution of oilseed rape and grass reseeds.
Why Revystar?
Revystar comprises the azole mefentrifluconazole and the SDHI fluxapyroxad, a systemic fungicide with protectant and healing properties for efficient illness management.
Its two energetic components are complementary to 1 one other, resulting in a broad vary of exercise in opposition to cereal pathogens.
Richard Visitor, BASF’s agronomy supervisor, notes that Revystar’s elevated greening advantages hold leaves greener for longer to extend photosynthesis charges and result in extra yield constructing.
He additionally notes that not like wheat crops, the decrease leaves in barley contribute a major proportion to closing yield.
Protecting these leaves clear of illness is important as they play a key function in photosynthesis ranges.
Containing the SDHI fluxapyroxad, the product additionally presents the flexibility to extend straw energy, which is especially necessary inside the space as heavy Cornish showers in August can usually go away heads on the bottom and result in pricey yield penalties.
Utilizing the suitable fungicide dose is especially necessary to keep away from resistance constructing.
Too excessive charges can enhance the resistance choice stress, whereas decreasing dose has the impact of lowering persistency of chemistry, leaving crops weak to late illness growth.
“Final season, fairly just a few folks in the reduction of on charges attributable to no seen indicators, however this got here again to chew them afterward within the season,” he says.
When utilized to barley supposed for malting, confer with the most recent timing restrictions for fluxapyroxad + mefentrifluconazole given by the British Beer and Pub Affiliation.
That is presently as much as progress stage 45 solely. There’s a most dose of 62.5 g/ha for fluxapyroxad, however there is no such thing as a restriction for mefentrifluconazole.
Fungicide therapy trial
Utilizing Revystar at T2 timing left Priaxor as the driving force of illness management of leaf 3 and 4 at T1.
Richard Visitor, BASF’s agronomy supervisor, explains {that a} genetic mutation in internet blotch often known as the FL129 mutation makes the illness proof against strobulurins, however he notes that Priaxor will not be as affected as others, makes it a sensible choice at this spray timing.
Outcomes | ||
Therapy |
Area therapy (litres/ha) |
BASF (litres/ha) |
T0 |
– |
– |
T1 (18 April) |
Revystar (fluxapyroxad + mefentrifluconazole), 0.75 |
Priaxor (Pyraclostrobin) 0.49 + Decoy (prothioconazole) 0.49 |
T2 (14 Could) |
SiltraXpro (bixafen+ prothioconazole), 0.4 |
Revystar (fluxapyroxad + mefentrifluconazole), 0.75 |
T3 (3 June) |
Proline 275 (Prothioconazole) 0.21 |
Proline 275 (Prothioconazole) 0.21 |
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