Table 1.

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

Farm/year and treatmentInorganic nitrogen,* kg⋅ha−1Carbon input, t⋅ha−1Water index, cmFlood events§Intermittent flooding regimeN2O, kg⋅ha−1CH4, kg⋅ha−1Yield, t⋅ha−1
Agroecological region# 3.0 (seed variety BPT 5204)
 Farm 1 2012
  Baseline913.9–4.5−555 (85)1Medium13.1 (6.03)66.5 (38.4)4.8
  Alternate04.1–4.8−580 (144)1Medium4.7 (1.53)81.1 (69.7)4.6
 Farm 2 2013
  Baseline2435.6–6.8−0.7 (33)3Mild0.62 (0.47)105 (7.23)4.8
  Alternate08.4–10.0−152 (16)3Mild0.10 (0.20)98.3 (74.5)2.7
Agroecological Region# 8.3 (seed variety ADT 39)
 Farm 3 2012
  Baseline2190.0–0.0−486 (10)0Medium22.7 (7.47)3.98 (4.89)4.2
  Alternate612.7–3.7−416 (81)0Medium2.51 (0.69)4.6 (0.39)2.7
 Farm 3 2013
  Baseline2020.6–0.8−1,036 (16)3Intense17.4 (15.4)108 (11.2)5.6
  Alternate202.5–3.0−858 (52)3Intense11.5 (9.55)112 (33.9)4.0
 Farm 4 2014
  Baseline1741.0–1.2−212 (63)3Mild/medium0.88 (0.83)141 (19.3)3.5
  Alternate911.1–1.4−316 (147)5Mild/medium0.02 (0.2)154 (54.3)3.2
Agroecological Region# 8.1 (seed variety ASD 16)
 Farm 5 2013
  Baseline1210.0–0.015 (65)3Mild1.39 (1.66)286 (49.1)6.5
  Alternate990.01–0.02−155 (91)4Mild2.47 (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.