Automatically generated translation
At the start of winter 2025-26, rapeseed has established a very good level of biomass. Values generally fluctuate between 1.2 and 2 kg/m². The average is 1.5 kg/m² in Normandy and 1.8 in Ile-de-France.
Based on a sample of 160 plots weighed manually in the field:
- half the plots reached or exceeded 1.6 kg/m² green biomass before winter entry. Last year, the median was 1.0 kg/m² for a similar sample.
- Nitrogen uptake is close to 80-90 kg N/ha on average, i.e. 20-30 units more at winter entry 2025 than a year ago.
- Compared with the average for the last five seasons, these values for biomass and pre-winter nitrogen uptake are 15-30% higher.
The cold weather since December 22 will lead to "normal" leaf loss over the coming weeks. So it's important to take this into account as much as possible.
For more details, read the note which gives an initial agro-climatic assessment and situates the 2025-26 winter entry biomass data in relation to multi-year references. Link to pdf file
We would like to thank all local players for their contributions to this summary.