| Treatment | Root Surface Area | |||||
| V6 | V12 | R1 | ||||
| m2∙m−2 | ||||||
| Previous Irrigation (PI) | Full | 218a | 738a | 1148a | ||
| Delayed | 196a | 461b | 1214a | |||
| Previous Crop (PC) | Corn | 199a | 659a | 1323a | ||
| Sunflower | 215a | 541a | 1139b | |||
| Tillage (T) | No Till | 253a | 609a | 1172a | ||
| Chisel Plow | 161b | 591a | 1190a | |||
| LSD | 25 | 235 | 144 | |||
| Source | df | P > f | ||||
| PI | 1 | 0.4457† | 0.0379 | 0.7986 | ||
| PC | 1 | 0.1733 | 0.2378 | 0.0055 | ||
| T | 1 | 0.0006 | 0.8388 | 0.7427 | ||
| PC × PI | 1 | 0.6400 | 0.2243 | 0.0866 | ||
| T × PI | 1 | 0.5713 | 0.4715 | 0.3640 | ||
| PC × T | 1 | 0.0723 | 0.2475 | 0.5193 | ||
| PI × PC × T | 1 | 0.1524 | 0.6982 | 0.1101 | ||