Impacts of long-term and recently imposed tillage practices on the vertical distribution of soil organic carbon

YANG, X.; DRURY, C.; REYNOLDS, W.; TAN, C.

doi:10.1016/J.STILL.2008.05.003

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Soil and Tillage Research · 2008

Impacts of long-term and recently imposed tillage practices on the vertical distribution of soil organic carbon

YANG, X., DRURY, C., REYNOLDS, W., TAN, C.

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Impacts of long-term and recently imposed tillage practices …

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Findings

What changed what, as the paper reports it. Grouped by the measured property.

SOC concentration

↑ 1↓ 1= 410

increase
long-term NT (LNT) vs. long-term mouldboard ploughing (LMP)significant · 0–5 cm · 1996,1997,1999,2002,2004 · Eugene Whelan Research Farm

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Impacts of long-term and recently imposed tillage practices on the vertical distribution of soil organic carbon · Knowledge Library

SOC stocks

↑ 1↓ 1= 49

increase
long-term NT (LNT) vs. long-term mouldboard ploughing (LMP)significant · 0–5 cm · 1996,1997,1999,2002,2004 · Eugene Whelan Research Farm · 750Mg/ha equivalent soil mass; depths approximate to LNT; paired t-tests0.05 (1999 also0.01).
Numbers
- treatment 21.5 vs. control 17.59 Mg C ha-1 (+22.23 %) · 0–5 cm · 1996
- treatment 21.27 vs. control 16.66 Mg C ha-1 (+27.67 %) · 0–5 cm · 1997
- treatment 22.3 vs. control 17.17 Mg C ha-1 (+29.88 %) · 0–5 cm · 1999
- treatment 21.22 vs. control 17.89 Mg C ha-1 (+18.61 %) · 0–5 cm · 2002
- treatment 20.01 vs. control 15.18 Mg C ha-1 (+31.82 %) · 0–5 cm · 2004
Source · p. 3
“SOC enrichment of 18–32% for LNT relative to LMP for a soil mass of 750 Mg ha 1 (approx. 0–5 cm depth)”
increase
long-term NT (LNT) vs. long-term mouldboard ploughing (LMP)significance not stated · 0–10 cm · 1996,1997,1999,2002,2004 · Eugene Whelan Research Farm · annual paired tests (Table 2): 1500 Mg/ha ESM significant only in 2002 (P < .05); other years not significant
Numbers
- treatment 37.89 vs. control 34.58 Mg C ha-1 (+9.572 %) · 0–10 cm · 1996
- treatment 36.88 vs. control 33.36 Mg C ha-1 (+10.55 %) · 0–10 cm · 1997
- treatment 37.54 vs. control 34.26 Mg C ha-1 (+9.574 %) · 0–10 cm · 1999
- treatment 37.9 vs. control 35.14 Mg C ha-1 (+7.854 %) · 0–10 cm · 2002
- treatment 34.71 vs. control 30.72 Mg C ha-1 (+12.99 %) · 0–10 cm · 2004
Source · p. 3
“a significant (P \< 0.05) SOC enrichment of 7–13% for”
Source · p. 3
“1500 Mg ha 1 (approx. 0–10 cm depth) (Table 2)”
no effect
long-term NT (LNT) vs. long-term mouldboard ploughing (LMP)not significant · 0–20 cm · 1996,1997,1999,2002,2004 · Eugene Whelan Research Farm · 3000Mg/ha equivalent mass, approximately0-20cm.
Numbers
- treatment 66.6 vs. control 63.87 Mg C ha-1 (+4.274 %) · 1996
- treatment 67.53 vs. control 68.34 Mg C ha-1 (-1.185 %) · 1997
- treatment 64.44 vs. control 69.75 Mg C ha-1 (-7.613 %) · 1999
- treatment 68.88 vs. control 67.72 Mg C ha-1 (+1.713 %) · 2002
- treatment 58.14 vs. control 58.89 Mg C ha-1 (-1.274 %) · 2004
Source · p. 3
“no significant (P \< 0.05) differences in SOC stocks were found for the 3000 Mg ha 1equivalentsoilmass”
decrease
new-MP (NMP) vs. long-term NT (LNT)significant · 0–5 cm · 1997,1999,2002,2004 · Eugene Whelan Research Farm · 750Mg/ha equivalent mass; all four years paired t-test P<0.05,1999 also<0.01.
Numbers
- treatment 16.81 vs. control 21.27 Mg C ha-1 (-20.97 %) · 0–5 cm · 1997
- treatment 17.34 vs. control 22.3 Mg C ha-1 (-22.24 %) · 0–5 cm · 1999
- treatment 19.12 vs. control 21.22 Mg C ha-1 (-9.896 %) · 0–5 cm · 2002
- treatment 15.21 vs. control 20.01 Mg C ha-1 (-23.99 %) · 0–5 cm · 2004
Source · p. 4
“SOC levels under NMP treatment were 10–24% lower than LNT for 750 Mg ha 1”
decrease
new-MP (NMP) vs. long-term NT (LNT)significance not stated · 0–10 cm · 1997,1999,2002,2004 · Eugene Whelan Research Farm · annual paired tests (Table 2): 1500 Mg/ha ESM significant in 1997 and 2004 (P < .05), not in 1999 and 2002
Numbers
- treatment 33.09 vs. control 36.88 Mg C ha-1 (-10.28 %) · 0–10 cm · 1997
- treatment 34.9 vs. control 37.54 Mg C ha-1 (-7.032 %) · 0–10 cm · 1999
- treatment 36.34 vs. control 37.9 Mg C ha-1 (-4.116 %) · 0–10 cm · 2002
- treatment 30.35 vs. control 34.71 Mg C ha-1 (-12.56 %) · 0–10 cm · 2004
Source · p. 4
“SOC levels under NMP treatment were 10–24% lower than LNT for 750 Mg ha 1, and 3–13% lower for 1500 Mg ha 1”
no effect
new-MP (NMP) vs. long-term NT (LNT)not significant · 0–20 cm · 1997,1999,2002,2004 · Eugene Whelan Research Farm · 3000Mg/ha equivalent mass, approximately0-20cm.
Numbers
- treatment 67.75 vs. control 67.53 Mg C ha-1 (+0.3258 %) · 1997
- treatment 67.71 vs. control 64.44 Mg C ha-1 (+5.074 %) · 1999
- treatment 67.8 vs. control 68.88 Mg C ha-1 (-1.568 %) · 2002
- treatment 58.84 vs. control 58.14 Mg C ha-1 (+1.204 %) · 2004
Source · p. 4
“there were no significant differences in SOC stocks for the 3000 Mg ha 1 equivalent mass”
increase
new-NT (NNT) vs. long-term mouldboard ploughing (LMP)significance not stated · 0–5 cm · 1997,1999,2002,2004 · Eugene Whelan Research Farm · annual paired tests (Table 2): 750 Mg/ha ESM significant only in 2004 (P < .05)
Numbers
- treatment 16.92 vs. control 16.66 Mg C ha-1 (+1.561 %) · 0–5 cm · 1997
- treatment 17.83 vs. control 17.17 Mg C ha-1 (+3.844 %) · 0–5 cm · 1999
- treatment 19.24 vs. control 17.89 Mg C ha-1 (+7.546 %) · 0–5 cm · 2002
- treatment 18.34 vs. control 15.18 Mg C ha-1 (+20.82 %) · 0–5 cm · 2004
Source · p. 4
“NNT produced enrichments of 2.0%, 4.0%, 8.0% and 21.8% in the 750 Mg ha”
no effect
new-NT (NNT) vs. long-term mouldboard ploughing (LMP)significance not stated · 0–20 cm · 1997,1999,2002,2004 · Eugene Whelan Research Farm · no net profile-stock change (Results); exception: at 3000 Mg/ha in 1999 NNT lower than LMP (63.43 vs 69.75, P < .05, Table 2)
Numbers
- treatment 67.1 vs. control 68.34 Mg C ha-1 (-1.814 %) · 1997
- treatment 63.43 vs. control 69.75 Mg C ha-1 (-9.061 %) · 1999 · Significant decrease in Table2; exception to overall conclusion.
- treatment 65.58 vs. control 67.72 Mg C ha-1 (-3.16 %) · 2002
- treatment 57.53 vs. control 58.89 Mg C ha-1 (-2.309 %) · 2004
Source · p. 4
“No net change in SOC occurred when the 3000 Mg ha 1”
Source · p. 5
“conversion of MP to NT leads to stratification of SOC but no change in total SOC stocks”
no effect
new-NT (NNT) vs. long-term NT (LNT)significance not stated · 0–20 cm · 1997, 1999, 2002, 2004 · Eugene Whelan Research Farm · Abstract's qualitative plough-layer stock equivalence: conversion of 13-year MP to NNT in 1996, relative to continuous LNT. Table 2 reports 3000 Mg ha-1 equivalent soil mass (approximately 0-20 cm in LNT; actual depths vary with bulk density). No NNT/LNT stock pairwise test is reported; concentration-profile significance and tests against LMP do not apply.
Numbers
- treatment 67.1 vs. control 67.53 Mg C ha-1 (-0.6368 %) · 0–20 cm · 1997 · 3000 Mg ha-1 equivalent soil mass; depths approximate.
- treatment 63.43 vs. control 64.44 Mg C ha-1 (-1.567 %) · 0–20 cm · 1999 · 3000 Mg ha-1 equivalent soil mass; depths approximate.
- treatment 65.58 vs. control 68.88 Mg C ha-1 (-4.791 %) · 0–20 cm · 2002 · 3000 Mg ha-1 equivalent soil mass; depths approximate.
- treatment 57.53 vs. control 58.14 Mg C ha-1 (-1.049 %) · 0–20 cm · 2004 · 3000 Mg ha-1 equivalent soil mass; depths approximate.
Source · p. 1
“The continuous build-up of SOC in the surface of new-NT soils was associated with no change in the total amount of SOC in the plough layer relative to long-term NT.”

Sites

Eugene Whelan Research Farm

Location: Woodslee, Ontario, Canada42.22° N, 82.73° W
Climate: 8.9 °C mean annual temperature876 mm annual precipitation
Soil: Typic Argiaquoll (clayey, mixed, mesic) · USDA
Land use: corn–soybean rotationArable land
Management on the whole site: corn–soybean rotationCrop rotation

Soil layers
Depth	Texture	Clay	pH	Organic C	Bulk density
0–20 cm	clay loam	37 %	–	–	–

Impacts of long-term and recently imposed tillage practices on the vertical distribution of soil organic carbon

Findings

SOC concentration

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