Farmers are urged not to be too hasty when dropping winter oilseed rape from rotations based on short-term performance, according to agronomy firm ProCam.
Projections of its profitability relative to winter wheat for harvest 2019 could nudge it back closer into contention, it believes, especially when its wider agronomic benefits are also taken into account.
Figures from the company’s annual ‘big data’ analysis of thousands of hectares show the profitability of winter oilseed rape dropped below that of winter wheat for the first time in several years last harvest.
Winter oilseed rape gross margins on the top 25% of farms fell from £1,083/ha to £850/ha from harvest years 2017 to 2018, while winter wheat jumped from £1,014/ha to £1,250/ha.
However, this switchover was largely due to a rise in cereal prices after the drought-affected 2018 harvest, while OSR prices remained relatively static.
But a reversal in the current values of both crops, driven by estimates of a large global wheat harvest and a tighter European oilseed supply, could see this gross margin deficit narrow significantly for 2019, ProCam believes.
Using early harvest 2019 prices and 2018 yield figures, it calculates winter oilseed rape gross margins on the top 25% of farms of £936/ha compared with £955/ha for winter wheat.
Mike Thornton, head of crop production for ProCam, says the figures will vary farm-by-farm, but what this illustrates is how quickly margins can change.
“By the time you factor in winter oilseed rape's wider agronomic benefits within the rotation, its viability suddenly starts to look more attractive.
“Clearly, winter oilseed rape is not without its difficulties, not least cabbage stem flea beetle. But where growers look at the bigger picture, I think we could see it given another chance on many farms, especially as it now looks like we will have good soil moisture levels to drill into.
“New post-emergence herbicide options may also help by delaying expenditure on weed control until the crop is well-established.”
Mr Thorton adds: “The feedback from recent years’ problems with oilseed rape is that growers will become more ruthless with how the crop is managed, and be better prepared to spray it off and replace it with an alternative if flea beetles, slugs or pigeons strangle it early on, rather than struggle on with a yield-compromised crop.
“But this can all be managed with regular and careful crop monitoring,” he says.