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A new Clearfield oilseed rape is the first ever variety to layer four complex traits together without compressing yield, claims breeder DSV. New oilseed rape variety rewrites Clearfield rules

A new Clearfield oilseed rape is the first ever variety to layer four complex traits together without compromising yield, claims breeder DSV.

Added to the AHDB Candidate List for 2021/22, the variety is a significant advance in Clearfield winter oilseed rape and addresses many of the shortcomings of previous varieties, says the company’s Michael Farr.

Based on a  oilseed rape varieties resistant to the herbicide Imazamox, Clearfield technology has proved beneficial to growers in recent years because it makes it easy to control pernicious brassica weeds, he says.

“The system has provided reliable control of problem weeds such as charlock, runch and hedge mustard – but has also opened up significant management opportunities for many growers in recent years including reducing erucic acid levels at harvest.”

Good efficacy

Clearfield’s efficacy is so good that even fields which have been out of production for many years – often due to large weed burdens – can be made suitable for growing oilseed rape again, adds Mr Farr.

“The added flexibility Clearfield provides around early weed control strategies means the technology can also be used help fine-tune time of drilling and reduce competition during establishment.”

In the past, the price for all these benefits has often been reduced yield. Although varieties like DSV Plurax CL have done much to address this in recent years, it has still remained an issue for many growers.

“What has been missing from the market is a fully featured hybrid oilseed rape combining the very best agronomic package available featuring layered disease and yield protection traits with Clearfield technology but without the yield penalties.

“The introduction of Matrix CL allows the grower to choose powerful post emergence Clearfield chemistry without facing the potential drop in performance shown in the previous generations of varieties.

Impressive numbers

“The variety’s production figures are impressive to say the least. Matrix CL is one of a few varieties selected as a candidate for the whole of the UK making it suitable for growing in both the North, and East and West regions.”

But it has performed particularly well in the East/West region where it has achieved a gross output of over 108% and an oil content of 46.0% overall, says Mr Farr.

“It’s definitively the highest yielding Clearfield variety currently available to UK growers but its superiority doesn’t stop there. It’s got the best agronomic package seen in any Clearfield variety to date.”

Matrix CL is the first commercially available UK variety to combine Clearfield technology with TuYV resistance, pod shatter resistance and RLM7+ resistance to phoma stem canker.

“With improved vigour over even DSV Plurax CL and mirroring the vigour profiles of the top performing hybrids in both autumn and early spring, Matrix CL has performed particularly well in our high pressure flea beetle trials.”

Boasting high winter hardiness, Matrix CL also achieves top standing scores including 9 for lodging and 8 for stem stiffness with a medium flowering score of 5 and an early maturity score of 6.