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Table 2 Effects of CO2 treatment, latitude of origin, and CO2 × latitude interactions on plant morphological traits measured over time (week of observation)

From: Northern ragweed ecotypes flower earlier and longer in response to elevated CO2: what are you sneezing at?

  df df den F Prob > F
Number of male inflorescences
 CO2 2 1120 2.09 0.124
 Latitude 2 1120 583.01 <0.001
 CO2 × latitude 4 1120 2.56 0.037
 Time 5 5526 3642.91 <0.001
 Time × CO2 10 5525 1.33 0.207
 Time × latitude 10 5526 241.62 <0.001
 Time × CO2 × latitude 20 5525 2.36 0.001
 Chamber(CO2) 9 1119 13.22 <0.001
 Chamber (CO2) × latitude 18 1119 3.99 <0.001
 Chamber(CO2) × time 45 5522 7.22 <0.001
 Chamber(CO2) × latitude × time 90 5522 2.68 <0.001
Height (cm)
 CO2 2 1282 11.63 <0.001
 Latitude 2 1301 14.63 <0.001
 CO2 × latitude 4 1284 0.20 0.939
 Time 1 3066 9836.34 <0.001
 Time × CO2 2 3073 9.36 <0.001
 Time × latitude 2 3066 7.54 0.001
 Time × CO2 × latitude 4 3073 2.63 0.033
 Chamber(CO2) 9 1220 4.66 <0.001
 Chamber (CO2) × latitude 18 1222 0.71 0.806
 Chamber(CO2) × time 9 3072 6.19 <0.001
 Chamber(CO2) × latitude × time 18 3072 1.60 0.053
Number of branches
 CO2 2 1776 6.11 0.002
 Latitude 2 1625 56.41 <0.001
 CO2 × latitude 4 1549 6.06 <0.001
 Time 1 2904 6851.52 <0.001
 Time × CO2 2 2927 6.03 0.002
 Time × latitude 2 2886 41.38 <0.001
 Time × CO2 × latitude 4 2913 12.13 <0.001
 Chamber(CO2) 9 1459 2.04 0.032
 Chamber (CO2) × latitude 18 1342 3.48 <0.001
 Chamber(CO2) × time 9 2925 5.80 <0.001
 Chamber(CO2) × latitude × time 18 2909 6.48 <0.001