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Table 2 Weighted average annual soil organic carbon sequestration rates to 30 cm depth by USDA-ERS Farm Resource Region and soil disturbance sequence

From: What might it cost to increase soil organic carbon using no-till on U.S. cropland?

Tillage sequenceb USDA-ERS Farm Resource Regiona Average
BRR EUR FRR HR MPR NCR NGPR PGR SSR
Mg C ha−1 year−1
 CTCTNT 0.32 0.41 0.25 0.46 0.44 0.47 0.40 0.32 0.28 0.38
 CTRTNT 0.18 0.21 0.16 0.24 0.23 0.24 0.21 0.19 0.15 0.21
 CTNTNT 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 RTCTNT 0.27 N/Ac 0.35 0.43 N/A 0.43 0.44 0.13 N/A 0.33
 RTRTNT 0.26 0.18 0.13 0.24 0.19 0.24 0.23 0.20 0.12 0.23
 RTNTNT 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 NCCTNT 0.30 0.41 0.21 0.46 0.38 0.47 0.40 0.33 0.30 0.39
 NCRTNT 0.19 0.21 0.15 0.23 0.20 0.24 0.21 0.19 0.16 0.21
 NCNTNT 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 Overall average 0.25 0.32 0.22 0.34 0.34 0.36 0.31 0.27 0.23  
  1. aBRR = Basin and Range Region; EUR = Eastern Uplands Region; FRR = Fruitful Rim Region; HR = Heartland Region; MPR = Mississippi Portal Region; NCR = Northern Crescent Region; NGPR = Northern Great Plains Region; PGR = Prairie Gateway Region; SSR = Southern Seaboard Region
  2. bCTCTNT = Conventional tillage (CT) in 1982, CT in 1997 and no-till (NT) in 2017; CTRTNT = CT in 1982, reduced tillage (RT) in 1997 and NT in 2017; CTNTNT = CT in 1982, NT in 1997 and NT in 2017; RTCTNT = RT in 1982, CT in 1997 and NT in 2017; RTRTNT = RT in 1982, RT in 1997 and NT in 2017; RTNTNT = RT in 1982, NT in 1997 and NT in 2017; NCCTNT = Non-cropland (NC, e.g., hay, pasture, etc.) in 1982, CT in 1997 and NT in 2017; NCRTNT = NC in 1982, RT in 1997 and NT in 2017; NCNTNT = NC in 1982, NT in 1997 and NT in 2017
  3. cN/A indicates that this tillage sequence was not found in these Farm Resource Regions