where UT is the plant N uptake measured from aboveground biomass in a plot that received N at the rate of FN (kg ha−1), and U0 is the total N uptake from aboveground biomass in the treatment without N fertilizer addition (kg ha−1).
where UT is the plant N uptake measured from abovegroundbiomass in a plot that received N at the rate ofFN (kg ha−1), and U0 is the total N uptake from abovegroundbiomass in the treatment without N fertilizeraddition (kg ha−1).