Table 3. Effect of drip system on cumulative methane, CO 2-eq emission, yield-scaled CO 2-eq emission, and rice yield.
Numbers in the table represent means ± standard deviation (n =3). Letters indicate significant differences (P<0.05) among means according to an ANOVA.
| Treatments | Cumulative
methane (kg ha -1) |
CO
2-eq emissions
(kg CO 2 ha -1) |
Yield-scaled
CO 2-eq emission (kg CO 2-eq t -1) |
Yield Observation | ||
|---|---|---|---|---|---|---|
| GY | SY | HI
(%) |
||||
| (Kg ha -1) | (Kg ha -1) | |||||
| SDI+1.0 lph DRE | 97.2±6.0 D | 3304.8±202.5 D | 300.1±18.4 C | 4489±111.9 A | 7297±243.3 A | 38.1±0.31 A |
| SDI+0.6 lph DRE | 111.4±5.9 CD | 3788.9±200.7 CD | 348.1±18.4 C | 4305±69.0 A | 7234±250.5 AB | 37.4±0.60 AB |
| DI+1.0 lph DRE | 129.6±6.8 BC | 4406.4±231.6 BC | 435.6±22.8 B | 4038±125.6 B | 6943±304.3 AB | 36.8±0.70 AB |
| DI+0.6 lph DRE | 143.5±6.7 B | 4877.8±230.9 B | 499.5±23.8 B | 3783±60.0 B | 6719±295.7 AB | 36.1±0.75 BC |
| Conventional | 172.9±8.9 A | 5879.7±303.0 A | 594.2±30.6 A | 3430±65.2 C | 6562±110.3 B | 34.3±0.66 C |
| Mean | 130.9 | 4451.5 | 435.5 | 4009.2 | 6950.9 | 36.6 |
SDI, sub-surface drip irrigation; DI, surface drip irrigation; DRE, discharge rate emitters; Conventional, conventional flood aerobic irrigation.