Put a value on lodging in oilseed rape

Lodging in oilseed rape can cause significant crop losses, by reducing the amount of light getting into the canopy, by restricting essential assimilate supply and so reducing seed fill. “But oilseed rape growers have not been as aware of the financial impact of lodging as, say, cereal growers have been – that is until now,” says BASF Business Development Manager Clare Tucker.

For the first time growers are able to quantify the detrimental effects of lodging in rape - thanks to a new web-based tool based on detailed ADAS research. “The extent of yield loss in oilseed rape depends upon the growth stage when lodging occurs, the severity of lodging and how much of the crop is involved,” explains Clare.

This new tool on BASF’s website AgriCentre starts by asking the expected oilseed rape price and then the percentage of the crop that is lodged, the growth stage of the crop and the approximate lodging angle. Sliders are used to set these parameters and yield loss, financial losses and Thousand Seed Weight (TSW) changes due to lodging are calculated.

Clare points out that it is quite worrying how much yield can be lost from just a small amount of lodging. “The tool shows quite clearly the significant losses resulting from even low angle leanings (of around 22.5º), often regarded as insignificant to yield. Also rape growers could easily be unaware of how extensive lodging is in their crop, as it can go unnoticed in the middle of fields until harvest. Two aerial surveys, undertaken by ADAS in 2012 and again in 2014, give the real picture.”

“In 2012 35% of the area of rape surveyed was lodged at 45º or more and in 2014 this was 27%. Eight out of every ten fields in 2012 and nine out of every ten fields in 2014 had at least 10% of the total area lodged at 45º or more.”


ADAS also looked at the yield losses from lodging at different growth stages. Early lodging (mid-flowering) theoretically is the worst time for lodging, but there is potential for the plant to partly recover and light can reach the developing pods again. There is no time for plant recovery when lodging occurs at seed-fill – the pods still need light at this time and if cut-off by lodging, pod abortion occurs and yield is lost

Clare Tucker warns that the Oilseed Rape Lodging Yield Calculator considers yield loss, oil content and TSW. “But other issues such as poor desiccation, uneven ripening, increased admixture, increased drying costs and more volunteers will add to the problem.”