What limits nitrate uptake from soil

@article{Robinson1991WhatLN,
  title={What limits nitrate uptake from soil},
  author={D. Robinson and D. Linehan and S. Caul},
  journal={Plant Cell and Environment},
  year={1991},
  volume={14},
  pages={77-85}
}
An accepted view, that unless nitrate concentrations in the soil solution are very low (e.g. below 0.1−0.2 mol m −3 ) the growth of high-yielding crops is not limited by the availability of nitrogen, is challenged 
Nitrate Uptake and Its Regulation
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