Identification of Constraining Experimental-Design Factors in Mycorrhizal Pot-Growth Studies
Table 2
Root colonization summary for the pot size and water deficit experiment.
Frequency (%)
Root Length Colonized (%)
Density (mm-1)
Pot size
Irrigation
Hyphae
Vesicles
Arbuscules
Hyphae
Vesicles
Arbuscules
Vesicles
Arbuscules
Small
Drought
33.6 (6.7)a
24.4 (7.1)a
25.6 (4.8)a
54.0 (5.8)b
22.6 (5.2)b
28.0 (1.9)c
2.6 (0.2)b
3.2 (0.1)a
Well-Watered
40.8 (3.0)a
37.6 (4.1)a
25.2 (2.6)a
76.4 (5.1)b
43.0 (3.6)a
35.7 (9.2)bc
3.2 (0.3)a
3.6 (0.4)a
Large
Drought
44.6 (9.7)a
34.6 (9.5)a
31.0 (8.3)a
71.6 (6.1)b
24.2 (5.7)b
39.5 (6.8)b
2.7 (0.2)b
3.5 (0.1)a
Well-Watered
50.8 (8.4)a
38.8 (6.2)a
38.2 (7.1)a
85.2 (1.1)a
30.8 (1.3)b
56.1 (2.4)a
3.4 (0.4)a
3.7 (0.1)a
F-values and levels of significance
Pot size (P)
1.9 ns
0.6 ns
2.9 ns
1.4 ns
0.2 ns
1.1 ns
Irrigation (Ir)
0.0 ns
0.4 ns
0.5 ns
0.7 ns
2.4 ns
1.0 ns
0.0 ns
0.9 ns
PxIr
0.8 ns
1.4 ns
0.4 ns
1.6 ns
Block
0.8 ns
0.6 ns
2.2 ns
0.7 ns
0.7 ns
0.8 ns
1.0 ns
Means () and SE (inside parentheses) are shown, Shared letters within each column designate treatments that are not significantly different according to Bonferonni and Scheffé mean comparison tests, “ns” nonsignificant, , , .
