Later-drilled oilseed rape? Give it the best possible start

After a dry July has made earlier drilling more challenging in some areas — and with some growers also looking to avoid peak cabbage stem flea beetle migration — later drilling into late August or September could be a sensible option. But with less time for the crop to build before winter, the agronomy needs to be tailored accordingly.

Our Head of Crop Nutrition, Andrew Cromie, believes there is plenty to be positive about when it comes to oilseed rape.

“WOSR was one of the real success stories of the 2026 harvest, with many growers reporting good yields and strong margins compared with other crops,” says Andrew. “There’s certainly an appetite to grow more, and we could see plantings increase by 10–20% compared with the 2025–26 season.”

The challenge, particularly with later drilling, is making sure the crop gets away quickly enough to build the foundations for a strong spring.

Aim for a strong crop before winter

With a shorter growing window, the priority is to encourage rapid, healthy establishment.

“If you’re drilling later, the aim should be to get the crop to around 8–10 true leaves, with a tap root collar diameter of more than 8mm, before winter dormancy,” Andrew explains. “That gives the plant the reserves it needs to come through winter and get away strongly again in spring.”

Variety choice is a good place to start.

“Look for varieties with excellent autumn vigour to help compensate for the later drilling date,” he advises. “We’ve seen consistent results from RGT Blackmoon over several years.”

But variety is only one piece of the puzzle. With the soil starting to cool as we move further into autumn, nutrient availability can also become more challenging.

Don’t let nutrition hold the crop back

As soil temperatures fall, mineralisation slows and less nitrogen (N) becomes available to the growing crop. That makes it particularly important to make the most of the available nutrition, while of course staying within any applicable nitrogen restrictions.

“We want to make sure there’s enough N available either in the seedbed or shortly after drilling,” says Andrew. “At the same time, we need to make sure the crop has access to the full range of nutrients it needs for strong establishment.”

Macronutrients — nitrogen, phosphate, potassium and sulphur — all have an important role to play, alongside key micronutrients.

A starter fertiliser such as Microstar Actif Bzn, placed beneath the seed, can help get the crop moving by providing both water-soluble phosphate and protected phosphate that remains available to the developing plant.

“Root growth naturally slows in cold, wet soils,” Andrew explains. “So an early foliar phosphite treatment, such as Incite, applied from the cotyledon to two-leaf stage, can help encourage lateral rooting and improve the plant’s ability to explore the soil for nutrients.”

Supporting efficient nutrient use

It’s not simply about supplying nutrients — the crop also needs to be able to use them efficiently.

“Potassium and sulphur are particularly important for how effectively the plant uses available nitrogen,” says Andrew.

One option is Fulvivex, which provides key nutrients, including potassium, alongside 62% fulvic and humic acids.

“The fulvic and humic acids help make potassium more available to the plant, while also providing a biostimulant effect,” he adds. “We’d look at applying this around the six- to eight-leaf stage.”

Boron is another nutrient that shouldn’t be overlooked.

“Oilseed rape can take up boron very quickly when it’s growing strongly,” Andrew explains. “A deficiency can affect stem development and lead to problems such as hollow stems and splitting. A foliar boron application from the two- to four-leaf stage can help maintain good stem integrity.”

Fulvivex also provides a source of boron.

Don’t forget the micronutrients

There are several other micronutrients worth keeping on the radar during establishment.

Molybdenum, for example, plays an important role in nitrate reductase activity, helping the young plant convert absorbed nitrogen into protein.

Manganese and zinc are also important, supporting processes including photosynthesis and root development.

“Unconsolidated seedbeds can be particularly prone to micronutrient deficiencies,” says Andrew. “So it’s important to consider the conditions in the field rather than simply following a standard programme.”

Start with the soil

And while nutrition can give a young crop a helping hand, it can’t compensate for poor soil conditions.

“Nutrition alone cannot overcome poor soil management,” Andrew stresses. “Getting soil pH into the right range — around 6.5–7.0 — helps reduce nutrient lock-up, while addressing compaction allows the roots to explore properly for water and nutrients.”

Organic manures can also have an important role to play where they’re available and appropriate for the system.

“They provide valuable nutrients, but they can also support soil biology,” Andrew explains. “Combining the benefits of organic manures with targeted foliar nutrition and biostimulants can help us get even more from the crop.”

Make every day of growth count

With later drilling, every day of autumn growth counts. Choosing the right variety, establishing into good soil conditions and making sure the crop has access to the nutrients it needs can all help build a stronger plant before winter.

And with oilseed rape looking increasingly attractive in the rotation following a positive 2026 harvest, it’s worth investing in getting establishment right.

Planning to drill oilseed rape later this year?

Talk to your local ProCam agronomist about your variety choice, establishment strategy and nutrition programme. We can help you build a plan around your soils, drilling date and individual farm system — giving your crop the best possible start before winter.