Table 4 Contents of different aggregate size classes in air dry soil as influenced by crop rotation (I), manure application (II) and mineral N fertilizer (III) in the long-term field experiment at Grabow, Poland.
Crop rotation | Amendments | Aggregate content (g kg soil−1) | |||
|---|---|---|---|---|---|
Manure (Mg ha−1) | N rates (kg ha−1) | >0.5 mm | 0.5-0.25 mm | <0.25 mm | |
A (grain maize – winter wheat – spring barley – silage maize) | 0 | 0 | 615.7 | 181.7 | 202.6 |
0 | 100 | 617.7 | 172.0 | 210.3 | |
0 | 150 | 615.7 | 188.0 | 196.3 | |
Mean | 616.3 | 180.6 | 203.1 | ||
40 | 0 | 718.3 | 126.3 | 155.4 | |
40 | 100 | 700.3 | 146.0 | 153.7 | |
40 | 150 | 650.0 | 167.0 | 183.0 | |
Mean | 689.6 | 146.4 | 164.0 | ||
Overall mean | 652.9 | 163.5 | 183.6 | ||
B (grain maize – winter wheat† – spring barley – GCL‡) | 0 | 0 | 517.0 | 281.0 | 202.0 |
0 | 100 | 510.0 | 271.0 | 219.0 | |
0 | 150 | 526.3 | 249.0 | 224.7 | |
Mean | 517.8 | 267.0 | 215.2 | ||
40 | 0 | 539.3 | 272.0 | 188.7 | |
40 | 100 | 548.3 | 252.0 | 199.7 | |
40 | 150 | 508.3 | 277.7 | 214.0 | |
Mean | 532.0 | 267.2 | 200.8 | ||
Overall mean | 524.9 | 267.1 | 208.0 | ||
LSD (P ≤ 0.05) | For: I = 30.4, II = 44.0, III = n.s. Interactions = n.s. | For: I = 12.5, II = n.s., III = n.s. Interactions = n.s | For: I = 16.0, II = 19.6, III = n.s. Interactions = n.s. | ||
