Table 4: Field 2: stepwise regression relating peak biomass to the weighted (by biomass) plant parameters associated with the various species composition treatments. See Table 2 for further details.

N treatment (, ) P and Non fertilized treatment (, ) Variables Coefficient SE P Variables Coefficient SE P RGR 752.61 173.43 .0001 RGR 671.86 75.20 .0001 Imax-N 297.71 127.44 .0205 ρ 194.54 37.10 .0001 β −1028.09 82.49 .0001 Imax-N 167.03 61.76 .0071 τ −417.75 110.59 .0002 NUE −696.99 124.10 .0001 τ −555.37 70.25 .0001 β −523.47 43.72 .0001 R : S −187.21 39.71 .0001