Nitrogen uptake by rapeseed varieties from organic matter and inorganic fertilizer sources

Half of field crop nitrogen (N) is often derived soil organic matter (SOM) mineralization, yet we do not fully understand the extent to which plant genotypic differences influence SOM mineralization dynamics across different N contexts. We explored effects rapeseed (Brassica napus) diversity on uptake from and inorganic sources. In a greenhouse study, applied dual 15N labeled ammonium-nitrate fertilizer examine patterns in environments. Ten varieties were grown full factorial experiment with four treatments, including combinations high low SOM. found limited varietal total biomass or Across all varieties, was an important, additive source even as availability increased. High SOM/High Fertilizer treatment plants obtained 64% SOM, while SOM/Low 89% Under availability, addition increased overall by 42% relative treatment. Integrating reliance SOM-N sources into breeding NUE estimates has potential improve productivity system use efficiency.