Tuesday, June 25, 2019

Five-point plan offers guidance for delaying autumn wheat drilling

October 1, 2018 by  
Filed under Crops

Growers are being advised to consider delaying drilling winter wheat as long as possible this autumn – especially on land prone to blackgrass.

Much wheat has already been drilled – especially following recent rain on land harvested much earlier than normal, says Nick Myers, head of crop production for agronomy firm ProCam. But there is a compelling argument for holding back, he adds.

“Low blackgrass seed dormancy after the hot, dry summer might increase the temptation to bring drilling dates forward – because a bigger proportion of this year’s shed blackgrass seed is predicted to germinate earlier. But resist that temptation.

“The later you can safely delay drilling, the less blackgrass you’ll have emerging in the crop, and the less blackgrass seed will potentially be shed back to the soil next summer.


“Instead of viewing this as an opportunity to drill earlier, think of it as an opportunity to make worthwhile inroads into reducing blackgrass populations for the long-term.”

Mr Myers acknowledges it might be particularly tempting to edge drilling earlier again this year on farms where blackgrass levels have already started to decline following delayed drilling over recent years. But this could undo some of that good work.

“Some blackgrass will inevitably germinate later anyway,” he adds. “Obviously, you have to assess how late you can drill based on your farm situation. If you can’t delay all fields, at least delay those with the highest weed burdens.”

To help growers navigate through delayed autumn wheat drilling in blackgrass fields, Mr Myers suggests a five-point plan (see below).

“As well as helping against blackgrass, delaying drilling can also help against ryegrass, and help to reduce take-all, eyespot and lodging pressures in winter wheat,” says Mr Myers. “It can also help reduce the risk of BYDV because there are likely to be fewer aphids about.

“Moister soils with later drilling will also improve the uptake of residual herbicides by weeds, while colder soils will mean residual herbicides are broken down more slowly, so they last longer.

“That said, do balance delayed drilling with allowing enough time to prepare the land and enough time for post-planting activities, such as spraying before the weather closes in.”

Five-point plan

Leave stubbles undisturbed as long as possible. That way you’ll allow longer for blackgrass seed on the surface to germinate, but also longer for it to be eaten by predators. Only disturb the soil at the point of having to prepare the seedbed.

Avoid using inversion tillage (ploughing) if possible. The longer you can leave buried blackgrass seed underground, the more of it will rot away.

Prepare high quality seedbeds. These will stimulate the maximum amount of blackgrass to germinate before planting the crop. That way, even more blackgrass can be killed off in a stale seedbed. Good seedbeds will also produce better performance from soil-acting herbicides, he notes.

Depending on farm situation, consider delaying drilling until well into October. October-drilled wheat generally contains much less blackgrass than wheat drilled in September. ProCam’s 4Cast crop database suggests winter wheat yield hasn’t declined despite delays in the average drilling date from 2 October to 12 October over the past seven years. This is most likely because any yield penalty is offset by crops containing less blackgrass.

Adapt agronomy according to later drilling. Select wheat varieties that can compensate for later drilling through greater tillering, and that are flexible with regard to drilling date. The variety might be 1 or 2% lower yielding on paper, but you could end up with a better crop. Also, take steps to maximise establishment, for example by using a seed treatment shown to produce rapid establishment.

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