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. 2018 Sep 10;115(39):9720–9725. doi: 10.1073/pnas.1809276115

Table 1.

Farm-specific baseline (business as usual), APs, and GHG emissions

Farm/year and treatment Inorganic nitrogen,* kg⋅ha−1 Carbon input, t⋅ha−1 Water index, cm Flood events§ Intermittent flooding regime N2O, kg⋅ha−1 CH4, kg⋅ha−1 Yield, t⋅ha−1
Agroecological region# 3.0 (seed variety BPT 5204)
 Farm 1 2012
  Baseline 91 3.9–4.5 −555 (85) 1 Medium 13.1 (6.03) 66.5 (38.4) 4.8
  Alternate 0 4.1–4.8 −580 (144) 1 Medium 4.7 (1.53) 81.1 (69.7) 4.6
 Farm 2 2013
  Baseline 243 5.6–6.8 −0.7 (33) 3 Mild 0.62 (0.47) 105 (7.23) 4.8
  Alternate 0 8.4–10.0 −152 (16) 3 Mild 0.10 (0.20) 98.3 (74.5) 2.7
Agroecological Region# 8.3 (seed variety ADT 39)
 Farm 3 2012
  Baseline 219 0.0–0.0 −486 (10) 0 Medium 22.7 (7.47) 3.98 (4.89) 4.2
  Alternate 61 2.7–3.7 −416 (81) 0 Medium 2.51 (0.69) 4.6 (0.39) 2.7
 Farm 3 2013
  Baseline 202 0.6–0.8 −1,036 (16) 3 Intense 17.4 (15.4) 108 (11.2) 5.6
  Alternate 20 2.5–3.0 −858 (52) 3 Intense 11.5 (9.55) 112 (33.9) 4.0
 Farm 4 2014
  Baseline 174 1.0–1.2 −212 (63) 3 Mild/medium 0.88 (0.83) 141 (19.3) 3.5
  Alternate 91 1.1–1.4 −316 (147) 5 Mild/medium 0.02 (0.2) 154 (54.3) 3.2
Agroecological Region# 8.1 (seed variety ASD 16)
 Farm 5 2013
  Baseline 121 0.0–0.0 15 (65) 3 Mild 1.39 (1.66) 286 (49.1) 6.5
  Alternate 99 0.01–0.02 −155 (91) 4 Mild 2.47 (1.16) 216 (88.1) 6.5

All errors in parentheses represent the ±95% confidence intervals (n = 3).

*

The ranges for mineralized organic nitrogen and emission factors for each replicate are presented in Dataset S1, Table 30.

Organic C content range as estimated via literature review (Dataset S1, Table 4–9).

Cumulative extent of flooding as determined by FWTs (SI Appendix, SI Text, section 3).

§

Number of times a replicate had flooding for >3 d.

SI Appendix, Fig. S1 presents our definitions of flooding regimes.

#

See SI Appendix, Fig. S2, for a regional map.

The methane flame ionization detector behaved anomalously in this cropping season, likely causing unusually low methane emissions.