Evolution of cultivation practices in cooperatives or companies commited to improvement efforts.
|% of the total area
|Decision Support System to calculate the rate of N fertilizer by taking into account the biomass at the end of winter
|No tool is used
|Tool with visual estimation of the biomass
|Tool with estimation of the biomass by weighing
|Tool with estimation of the biomass by remote sensing
|Difference between the amount of N fertilizer actually applied and the calculated rate within −10 to 10 kg N ha−1
|Rapeseed cultivated after a legume preceding crop
|Rapeseed cultivated with frost sensitive legumes
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