Table 4 Total CO 2 emitted and proportion of applied C lost as CO 2 after addition of OAs to two sugarcane soils (sandy loam and clay) from Broadwater (NSW) after 30 and 60Â days incubation
From: Greenhouse gas emissions from sub-tropical agricultural soils after addition of organic by-products
|  | Applied C (t ha-1) | Sandy loam soil | Clay soil | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Treatment | Total CO2–C emissions | Net CO2-C‡/C applied | Total CO2–C emissions | Net CO2-C‡/C applied | ||||||
|  | (kg CO2–C ha-1) | (%) | (kg CO2–C ha-1) | (%) | ||||||
| Â | D30 | D60 | D30 | D60 | D30 | D60 | D30 | D60 | ||
60% WFPS | UN | 0 | 101 ± 6 | 235 ± 16 | - | - | 279 ± 11 | 612 ± 22 | - | - |
MM | 9.27 | 533 ± 36 | 910 ± 46 | 4.7 ± 0.4 | 7.3 ± 0.5 | 686 ± 26 | 1314 ± 85 | 4.4 ± 0.4 | 7.6 ± 0.9 | |
RB | 25.95 | 174 ± 9 | 395 ± 17 | 0.3 ± 0.03 | 0.6 ± 0.1 | 346 ± 7 | 724±13 | 0.3 ± 0.1 | 0.4 ± 0.1 | |
MB | 15.87 | 364 ± 17 | 661 ± 10 | 1.7 ± 0.1 | 2.7 ± 0.1 | 590 ± 15 | 1084 ± 38 | 2.0 ± 0.2 | 3.0 ± 0.3 | |
CM | 6.50 | 158 ± 9 | 312 ± 17 | 0.9 ± 0.2 | 1.2 ± 0.4 | 344 ± 14 | 721 ± 28 | 1.0 ± 0.2 | 1.7 ± 0.5 | |
HC | 4.51 | 298 ± 22 | 487 ± 19 | 4.4 ± 0.6 | 5.6 ± 0.6 | 401 ± 27 | 762 ± 40 | 2.7 ± 0.5 | 3.3 ± 0.9 | |
75% WFPS | UN | 0 | 116 ± 5 | 254 ± 18 | - | - | 306 ± 10 | 659 ± 15 | - | - |
MM | 9.27 | 497 ± 71 | 820 ± 97 | 4.1 ± 0.7 | 6.1 ± 1.1 | 713 ± 45 | 1331 ± 75 | 4.4 ± 0.4 | 7.2 ± 0.7 | |
RB | 25.95 | 156 ± 8 | 332 ± 24 | 0.2 ± 0.04 | 0.3 ± 0.1 | 419 ± 12 | 860 ± 27 | 0.4 ± 0.02 | 0.8 ± 0.1 | |
MB | 15.87 | 397 ± 31 | 718 ± 31 | 1.8 ± 0.2 | 2.9 ± 0.3 | 624 ± 18 | 1179 ± 30 | 2.0 ± 0.1 | 3.3 ± 0.2 | |
CM | 6.50 | 153 ± 12 | 299 ± 19 | 0.6 ± 0.2 | 0.7 ± 0.3 | 383 ± 15 | 786 ± 31 | 1.2 ± 0.3 | 2.0 ± 0.3 | |
HC | 4.51 | 286 ± 12 | 458 ± 15 | 3.8 ± 0.3 | 4.5 ± 0.6 | 438 ± 14 | 838 ± 32 | 2.9 ± 0.4 | 3.9 ± 0.5 | |
90% WFPS | UN | 0 | 93 ± 3 | 203 ± 3 | - | - | 329 ± 11 | 728 ± 22 | - | - |
MM | 9.27 | 433 ± 43 | 725 ± 49 | 3.7 ± 0.4 | 5.6 ± 0.5 | 698 ± 28 | 1373 ± 44 | 4.0 ± 0.3 | 7.0 ± 0.7 | |
RB | 25.95 | 136 ± 11 | 302 ± 27 | 0.2 ± 0.04 | 0.4 ± 0.1 | 448 ± 5 | 891 ± 21 | 0.5 ± 0.1 | 0.6 ± 0.1 | |
MB | 15.87 | 370 ± 7 | 635 ± 28 | 1.7 ± 0.05 | 2.7 ± 0.2 | 698 ± 25 | 1324 ± 67 | 2.3 ± 0.2 | 3.8 ± 0.5 | |
CM | 6.50 | 154 ± 13 | 317 ± 26 | 0.9 ± 0.2 | 1.8 ± 0.4 | 424 ± 16 | 838 ± 29 | 1.5 ± 0.3 | 1.7 ± 0.5 | |
HC | 4.51 | 300 ± 30 | 459 ± 32 | 4.6 ± 0.7 | 5.7 ± 0.8 | 471 ± 10 | 885 ± 34 | 3.1 ± 0.4 | 3.5 ± 1.1 | |