Agricultural Solutions UK
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The complete OSR system

To get any good outcome, you must start with the right tools. The Clearfield® production system combines high performing, vigorous hybrid varieties and powerful post-emergence herbicides, which, when used together, can revolutionise your approach to OSR management. Flexible, fast establishing and effective against the widest range of weeds, it’s a system that has grown in popularity over recent years; becoming the system of choice for many growers as an easier, practical way to grow a reliable, high yielding oilseed rape crop.


  • The most flexible & broad-spectrum weed control system for oilseed rape

  • Rapid Establishment – minimise risk of crop failure

  • Remove sources of erucic acid for a high-quality crop at harvest

  • Wide range of market-leading varieties for all agronomic situations

Why Clearfield®?

The Clearfield® system is well known for delivering excellent problem weed control, but it is also quickly becoming the system of choice for many growers for a host of other reasons. With over 78,000 hectares of Clearfield® OSR in the ground this year (according to market research company Kleffmann) it is clearly no longer a niche crop, grown only to control difficult cruciferous weeds, but an easier, practical way of growing a reliable, high yielding rape crop. Growers also value Clearfield® for the control of volunteers, helping with achieving an optimum plant canopy, which is essential for maximising yields. In addition, with volunteers now identified as a major contributor to the erucic acid problem, their control means a purer oil sample at harvest, especially where high erucic acid rape (HEAR) or industrial rape on set-aside has been grown in the past.


"Clearfield has transformed the way we grow OSR, the performance is phenomenal."

Robin Aird, Farm Manager, Charlton Park Estate, Wiltshire

"The results are very, very impressive, we now get 100% corner-to-corner crops."

Toby Hogsbjerg, Farm Manager, Swinbrook Estate, Oxfordshire

The most flexible and broad-spectrum weed control system for oilseed rape

The post-emergence, contact and residual activity of Cleranda® and Cleravo® provide the widest available control of any available herbicide in oilseed rape.

Brassica weeds


  • Prevalent soil types: found on well-aerated and well-watered but drained, alkaline-rich soils, which have a high organic matter content.

Runch (Wild Radish)

  • Prevalent soil types: it prefers lime-free but nutrient-rich sandy and loam soils.

Hedge Mustard

  • Prevalent soil types: likes dry, loose, nutrient-rich loams and sandy, stony soils.

Shepherd’s Purse

  • Prevalent soil types: it generally grows in nutrient-rich soils, with pH>5, such as humus-rich loams and nitrate-rich sandy soils.

Volunteer oilseed rape

Control of volunteers helps achieve an optimum plant canopy, which is essential for maximising yields. With volunteers now identified as a major contributor to the erucic acid problem, their control means a purer oil sample at harvest, especially where high erucic acid rape (HEAR) or industrial rape on set-aside has been grown in the past.

Removal of cover/catch crops

The Clearfield®system will allow for effective removal of a white mustard cover crop.

Remove sources of euric acid

New legislation will enforce a maximum level of 2% erucic acid in oilseed rape to be used in food products. The Clearfield®system is a unique tool to help reduce the potential contamination coming from both volunteer HEAR oilseed rape and brassica weeds high in erucic acid, such as charlock, runch and hedge mustard. For this system to work effectively to minimise the risks of erucic acid contamination, it is essential that the Clearfield® herbicides, either Cleranda® and Cleravo® are applied according to the label instructions.

Volunteer oilseed rape

It is important to manage volunteer OSR in the rotation. In cereal crops, volunteers can be controlled relatively effectively. However. the only way to control oilseed rape volunteers and many erucic acid producing weeds within the OSR crop is using the Clearfield® system.

Work carried out in 2018 by NIABTAG, funded by AHDB, has confirmed that volunteer oilseed rape, with high or elevated erucic acid levels, has been responsible for the high levels of erucic acid found in harvested samples (AHDB Project report No. 602). The report concluded that over time, and because of the genetically dominant nature of the high erucic trait, the problem has been amplified and moved around the farm through the practice of farm saving conventional seed.

Weeds high in erucic acid

With weed and volunteer control identified as a key control point, Clearfield® is a unique tool to reduce the potential contamination arising from high populations of brassica weeds such as charlock, runch and hedge mustard, as well as volunteer oilseed rape.

Avoidance of volunteers by good husbandry and sowing certified seed that has been tested and confirmed to be <0.1% erucic acid can help to solve the problem but where erucic acid contamination arising from volunteers is a concern, or unknown, the Clearfield®system is a useful tool to eradicate the problem.

One single fully high erucic acid volunteer seed, at 50% erucic acid, in a sown population of 50 plants, has the potential to raise the erucic acid level in the harvested sample by 1%.

It is difficult to identify volunteers by eye but around flowering-time, they can be easier to spot, as they may have different plant types, heights or flowering dates.

Clearfield removes potential sourcesErucic acid %
High Erucic Acid (HEAR) volunteer oilseed rape57.1
Charlock (Sinapis arvensis)31.7
Runch/Wild radish (Raphanus raphanistrum)26.7
Hedge mustard (Sisymbrium officinale)20.9

Impact of Clearfield® production system on the quality of winter oilseed rape oil, Leaper D, J and Melloul, S 2010.

Rapid establishment

With establishment regularly named as the biggest challenge when it comes to growing oilseed rape, Clearfield® hybrids can help mitigate risks in establishment by getting your crop off to the best start.

Hybrid vigour

Most Clearfield® hybrids demonstrate a rapid autumn growth habit, helping the crop to grow away from pest challenges such as cabbage stem flea beetle and slugs.

Tolerance to SU residues

Where sulphonylurea (SU) herbicides have been used in the previous crop, for example in spring barley, SU residues can exist in the soil and may affect establishment of the following oilseed rape crop, particularly where the soil has not been sufficiently cultivated. Because all Clearfield® hybrids are tolerant of SU herbicides, their establishment will not be affected.

Clearfield® hybrids are tolerant to SU residues in the soil

Wide range of market-leading hybrids

As grower confidence in the Clearfield® system has grown, so has the range of hybrids to choose from. There are 16 Clearfield® hybrids available for autumn 2019, with a range of growth habits, agronomic performance and yield potential. AHDB has also acknowledged the overall importance of the Clearfield® trait, with a UK hybrid gaining a UK recommendation on the 2019/20 Recommended List, and a further hybrid is a candidate for consideration for the 2020/21 List. Clearfield® hybrids are denoted by the CL suffix after the variety name. Further information on individual hybrids is available from the breeders.

Corteva Agriscience
PT279CL ^AHDB UK Recommended 2019/20


DK Imperial CL

DK Importer CL

DK Impression CL

DK Impressario CL
Phoenix CL

Plurax CL

Simplex CL

Veritas CL
Es Aquarel CL

Es Decibel CL
Conrad CL
RAGT Seeds
Nizza CL #AHDB candidate East/West 2019/20
Himmedia CL
OSR Seed

OSR Seed

Find out more about our other seed brand, InVigor!

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