Barrier | Zone 1 (3 cm < radius ≤ 18 cm) | Zone 2 (18 cm < radius ≤ 30 cm) | Zone 3 (30 cm < radius ≤ 60 cm) | Zone 4 (60 cm < radius ≤ 120 cm) | Zone 5 (120 cm < radius ≤ 180 cm) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Small | Medium | Large | Small | Medium | Large | Small | Medium | Large | Small | Medium | Large | Small | Medium | Large | |
Check | 1.6 a | 2.9 a | 4.2 a | 2.9 a | 3.1 a | 3.6 a | 5.3 a | 3.7 a | 2.5 a | 9.5 | 5.2 a | 1.0 a | 6.8 | 2.4 | 0.1 |
#5 container | 0.6 b | 0.3 b | 0.6 b | 1.3 b | 0.5 b | 0.6 bc | 2.1 b | 1.9 b | 0.5 b | 8.2 | 1.9 b | 0.0 b | 5.6 | 0.7 | 0.0 |
Polyethylene sleeve | — | — | — | 0.7 b | 0.9 b | 0.9 c | 2.4 b | 1.9 b | 1.0 b | 5.7 | 2.8 b | 0.6 ab | 6.7 | 2.5 | 0.1 |
#15 container | — | — | — | 0.4 b | 0.2 b | 0.0 c | 2.3 b | 0.6 c | 0.2 b | 5.4 | 1.1 b | 0.2 b | 5.4 | 1.2 | 0.0 |
DeepRoot® | — | — | — | — | — | — | 1.5 b | 0.8 bc | 0.1 b | 6.5 | 1.7 b | 0.0 b | 7.1 | 1.4 | 0.0 |
Least significant differencey (P = 0.05) | 0.8 | 0.9 | 0.8 | 1.4 | 1.2 | 0.8 | 1.9 | 1.2 | 1.0 | NS | 1.9 | 0.6 | NS | NS | NS |