A Plant and nutrient indices:


where: Y, Y0, Yi—seed yield, seed yield on the N control plot and N fertilized plots, t ha−<sup>1</sup> or kg ha−1; TB—total biomass—t ha−<sup>1</sup> or kg ha−1; TN—total N uptake, kg ha−1; Nse—amount of N in seeds, kg ha−1; Nf − N fertilizer rate, kg ha−1; TN, TN0, TNi—total amount of N in WOSR at harvest for the N control and N fertilized plots.
