Table 5 The root morphology of Italian ryegrass at the fourth clipping stage.
Treatments | Total length (cm) | Surface area (cm2) | Average diameter (mm) | Root volume (cm3) | Tips | Branches |
|---|---|---|---|---|---|---|
N fertilizer type | ||||||
CRU | 1480.89 a | 180.23 a | 0.35 a | 1.61 a | 14,956 12 a | 16,076.37 a |
Urea | 1377.67 b | 159.56 b | 0.32 b | 1.49 b | 13,947 .33 b | 14,872.35 b |
K fertilizer rate (kg ha−1) | ||||||
150 | 1393.00 c | 164.50 b | 0.32 b | 1.51 c | 14,113.50 c | 14,989.31 c |
300 | 1479.67 a | 176.17 a | 0.35 a | 1.60 a | 14,754.17 a | 15,905 04 a |
450 | 1415.16 b | 168.67 b | 0.33 b | 1.55 b | 14,487.33 b | 15,528.78 b |
N × K interaction | ||||||
Control | 1229.67 e | 75.33 e | 0.23 c | 0.90 d | 8142.02 e | 10,214.56 e |
CRU × KCl150 | 1434.09 bc | 173.66 b | 0.33 b | 1.56 bc | 14,521.72 bc | 15,490.34 c |
CRU × KCl300 | 1545.33 a | 188.45 a | 0.36 a | 1.67 a | 15,411.23 a | 16,699.76 a |
CRU × KCl450 | 1463.73 b | 178.76 b | 0.34 ab | 1.61 ab | 14,935.33 ab | 16,039.72 b |
Urea × KCl150 | 1352.01 d | 155.33 d | 0.31 b | 1.46 c | 13,705.49 d | 14,488.36 d |
Urea × KCl300 | 1414.21 c | 164.98 c | 0.34 ab | 1.52 bc | 14,097.34 cd | 15,111.23 c |
Urea × KCl450 | 1367.03 d | 159.35 cd | 0.32 b | 1.49 c | 14,039.76 cd | 15,017.74 c |
Source of variance | ||||||
N | < 0.0001 | < 0.0001 | 0.0111 | < 0.0001 | < 0.0001 | < 0.0001 |
K | < 0.0001 | 0.0013 | 0.0197 | 0.0003 | 0.0002 | 0.0004 |
N × K | 0.063 | 0.3063 | 0.9734 | 0.1898 | 0.0321 | 0.0937 |
