Table 4 Mean standing root biomass (kg ha−1) by soil depth and total down to 90 cm depth for the same water and N treatments described in Table 1. Values in parentheses show standard error. Different letters indicate significant differences between N treatments. ANOVA P-values for each main effect are presented at the bottom of the table with significant effects (P < 0.05) in bold.
From: High N availability decreases N uptake and yield under limited water availability in maize
Water Trt | N Trt | Root biomass (kg ha−1) by soil depth | Total root biomass (kg ha−1) | |||
|---|---|---|---|---|---|---|
0–15 cm | 15–30 cm | 30–60 cm | 60–90 cm | |||
FW | H | 1251 (320) | 603 (129) | 575 (121) | 393 (95) a | 2824 (525) |
M | 1552 (86) | 351 (59) | 614 (100) | 160 (43) ab | 2678 (35) | |
L | 1160 (398) | 449 (126) | 391 (85) | 126 (44) b | 2125 (565) | |
LW | H | 797 (148) | 555 (39) | 573 (138) | 73 (34) a | 1998 (302) |
M | 866 (305) | 470 (11) | 409 (43) | 181 (24) b | 1927 (354) | |
L | 1460 (411) | 440 (81) | 488 (36) | 289 (54) b | 2679 (419) | |
ANOVA | ||||||
Water | 0.27 | 0.75 | 0.65 | 0.27 | 0.30 | |
N | 0.20 | 0.08 | 0.25 | 0.62 | 0.67 | |
W × N | 0.36 | 0.54 | 0.67 | < 0.01 | 0.13 | |
