Appendix A. Dataset.

(Carbon input differences as the main factor explaining the variability in soil organic C storage in no-tilled compared to inversion tilled agrosystems)

Table A.

Soil organic C stocks under no-till (NT) and inversion tillage (IT), and associated characteristics (site, cropping system and soil textural class) from the selected studies

Reference / Site / Site characteristics
(mean annual data) / Cropping system / Soil
Location / Coordinates / Precip. / Temp. / Aridity / Organic C inputs / DIrela / Texture / Soil organic C
(SOC)b / NT vs. IT
(relative)
(mm) / (ºC) / (P/ETP) / (Mg C ha-1 year-1) / (0-30 cm,
Mg C ha-1)
NT / IT / NT / IT
Àlvaro-Fuentes et al.(2008) / Selvanera, Spain / (41°50'N; 1°17'E) / 475 / 13.9 / 0.59 / silt loam / 46.60 / 53.16 / -0.123
Agramunt, Spain / (41°48'N; 1°7'E) / 430 / 14.2 / 0.54 / silt loam / 41.10 / 39.63 / 0.037
Peñaflor, Spain / (41°44'N; 0°46'E) / 390 / 14.5 / 0.48 / silt loam / 39.50 / 39.11 / 0.010
Peñaflor, Spain / (41°44'N; 0°46'E) / 390 / 14.5 / 0.48 / silt loam / 34.50 / 33.01 / 0.045
Black & Tanaka (1997) / Mandan, ND, USA / (46°46'N; 100°55'W) / 400 / 5.2 / 0.67 / 0.733 / 0.743 / -0.014 / silt loam / 61.17 / 64.38 / -0.050
Mandan, ND, USA / (46°46'N; 100°55'W) / 400 / 5.2 / 0.67 / 0.729 / 0.725 / 0.006 / silt loam / 57.58 / 65.21 / -0.117
Mandan, ND, USA / (46°46'N; 100°55'W) / 400 / 5.2 / 0.67 / 0.752 / 0.767 / -0.019 / silt loam / 58.47 / 70.16 / -0.167
Mandan, ND, USA / (46°46'N; 100°55'W) / 400 / 5.2 / 0.67 / 1.173 / 1.074 / 0.092 / silt loam / 73.45 / 49.43 / 0.486
Mandan, ND, USA / (46°46'N; 100°55'W) / 400 / 5.2 / 0.67 / 1.326 / 1.129 / 0.175 / silt loam / 71.18 / 63.12 / 0.128
Mandan, ND, USA / (46°46'N; 100°55'W) / 400 / 5.2 / 0.67 / 1.415 / 1.182 / 0.196 / silt loam / 77.37 / 66.47 / 0.164
Blanco-Canqui & Lal (2008) / Glasgow, KY, USA / (37°0'N; 85°55'W) / 1342 / 13.3 / 1.66 / silt / 33.09 / 22.25 / 0.487
Fremont, OH, USA / (41°21'N; 83°5'W) / 870 / 9.4 / 1.28 / silt / 42.14 / 34.88 / 0.208
Calegari et al. (2008) / Pato Branco, PR, Brazil / (26°07'S; 52°41' W) / 1329 / 18.1 / 1.54 / clay / 81.92 / 79.41 / 0.032
Pato Branco, PR, Brazil / (26°07'S; 52°41' W) / 1329 / 18.1 / 1.54 / clay / 94.03 / 88.24 / 0.066
Pato Branco, PR, Brazil / (26°07'S; 52°41' W) / 1329 / 18.1 / 1.54 / clay / 87.95 / 87.49 / 0.005
Pato Branco, PR, Brazil / (26°07'S; 52°41' W) / 1329 / 18.1 / 1.54 / clay / 95.36 / 92.71 / 0.029
Continued
Table A.(Contd.)
Pato Branco, PR, Brazil / (26°07'S; 52°41' W) / 1329 / 18.1 / 1.54 / clay / 92.83 / 94.44 / -0.017
Pato Branco, PR, Brazil / (26°07'S; 52°41' W) / 1329 / 18.1 / 1.54 / clay / 96.92 / 92.41 / 0.049
Carter (2005) / Prince Edwards Island, Canada / (46°28'N; 63°10'W) / 1073 / 5.4 / 1.98 / 1.819 / 1.781 / 0.021 / sand / 52.10 / 53.10 / -0.019
Christopher et al. (2009) / MRCSP (P98), IN, USA / (40°55'N; 86°43'W) / 951 / 9.4 / 1.41 / sand / 37.50 / 76.30 / -0.509
MRCSP (P114b), IN, USA / (39°11'N; 87°12'W) / 1022 / 11.3 / 1.37 / silt / 45.50 / 37.40 / 0.217
MRCSP (P122), IN, USA / (38°15'N; 86°14'W) / 1142 / 12.1 / 1.42 / silt / 19.30 / 23.80 / -0.189
MRCSP (P99), OH, USA / (40°57'N; 84°27'W) / 923 / 10.9 / 1.32 / clay / 21.90 / 23.20 / -0.056
MRCSP (P111a), OH, USA / (39°50'N; 84°33'W) / 965 / 9.4 / 1.34 / silt / 44.00 / 38.50 / 0.143
MRCSP (P111b), OH, USA / (40°24'N; 83°14'W) / 933 / 10.3 / 1.38 / silt / 51.80 / 39.50 / 0.311
MRCSP (P111c), OH, USA / (40°43'N; 81°53'W) / 925 / 10.2 / 1.41 / silt / 24.40 / 25.60 / -0.047
MRCSP (P111d), OH, USA / (39°39'N; 84°12'W) / 965 / 11.1 / 1.34 / silt / 34.70 / 40.10 / -0.135
MRCSP (P124), OH, USA / (40°16'N; 81°39'W) / 1004 / 11.9 / 1.49 / silt / 34.60 / 26.70 / 0.296
MRCSP (P126), OH, USA / (39°29'N; 81°26'W) / 1028 / 12.3 / 1.38 / silt / 36.60 / 51.20 / -0.285
MRCSP (P127), PA, USA / (41°07'N; 78°45'W) / 1075 / 8.8 / 1.72 / silt / 53.40 / 66.50 / -0.197
MRCSP (P147), PA, USA / (41°02'N; 76°43'W) / 920 / 9.2 / 1.38 / clay / 49.10 / 44.90 / 0.094
Dalal (1989) / Hermitage, Warwick, QLD, Australia / (28°12'S;152°06'E) / 1150 / 16.9 / 1.24 / clay / 53.30 / 51.51 / 0.035
Deen & Kataki (2003) / Elora Research Station, Guelph , ON, Canada / (43°42'N; 80°18'W) / 917 / 6.7 / 1.56 / 3.732 / 4.355 / -0.143 / silt / 71.04 / 74.90 / -0.052
Diaz-Zorita (1999) / Buenos Aires, Argentina / (34°54'S; 63°44'W) / 1005 / 16.2 / 1.21 / sand / 72.62 / 62.33 / 0.165
Dick et al. (1986) / Hoytville, OH, USA / (41°11'N; 83°47'W) / 845 / 9.5 / 1.24 / 2.131 / 2.379 / -0.104 / clay / 76.10 / 80.25 / -0.052
Hoytville, OH, USA / (41°11'N; 83°47'W) / 845 / 9.5 / 1.24 / clay / 72.88 / 68.41 / 0.065
Hoytville, OH, USA / (41°11'N; 83°47'W) / 845 / 9.5 / 1.24 / clay / 81.71 / 77.90 / 0.049
Dolan et al. (2006) / Rosemount, MN, USA / (44°45'N; 93°04'W) / 820 / 7.0 / 1.27 / 0.680 / 0.750 / -0.093 / silt / 95.20 / 98.37 / -0.032
Rosemount, MN, USA / (44°45'N; 93°04'W) / 820 / 7.0 / 1.27 / 0.840 / 0.900 / -0.067 / silt / 98.64 / 101.44 / -0.028
Continued
Table A.(Contd.)
Rosemount, MN, USA / (44°45'N; 93°04'W) / 820 / 7.0 / 1.27 / 2.470 / 2.850 / -0.133 / silt / 88.80 / 111.70 / -0.205
Rosemount, MN, USA / (44°45'N; 93°04'W) / 820 / 7.0 / 1.27 / 3.290 / 3.550 / -0.073 / silt / 107.03 / 107.61 / -0.005
Doran et al. (1998) / Sidney, NE, USA / (41°12'N; 103°W) / 446 / 8.5 / 0.71 / clay / 34.73 / 34.48 / 0.007
Sidney, NE, USA / (41°12'N; 103°W) / 446 / 8.5 / 0.71 / silt loam / 55.34 / 52.37 / 0.057
Du et al. ( 2010)c / Luancheng Agro. Exp. Stat., China / (37º53'N; 114º41'E) / 851 / 12.2 / 1.01 / 3.400 / 3.700 / -0.081 / silt / 45.56 / 46.26 / -0.015
Follet et al. (2005)c,d / El Bajio, Celaya, Mexico / (20°52'N; 100°48'W) / 1495 / 18.7 / 1.76 / 2.750 / 2.325 / 0.183 / clay / 58.30 / 43.90 / 0.328
El Bajio, Celaya, Mexico / (20°52'N; 100°48'W) / 1495 / 18.7 / 1.76 / 4.300 / 4.300 / 0.000 / clay / 58.10 / 49.90 / 0.164
El Bajio, Celaya, Mexico / (20°52'N; 100°48'W) / 1495 / 18.7 / 1.76 / 6.125 / 6.275 / -0.024 / clay / 62.80 / 50.90 / 0.234
El Bajio, Celaya, Mexico / (20°52'N; 100°48'W) / 1495 / 18.7 / 1.76 / 1.750 / 1.875 / -0.067 / clay / 45.30 / 45.20 / 0.002
El Bajio, Celaya, Mexico / (20°52'N; 100°48'W) / 1495 / 18.7 / 1.76 / 3.050 / 2.975 / 0.025 / clay / 45.20 / 45.40 / -0.004
El Bajio, Celaya, Mexico / (20°52'N; 100°48'W) / 1495 / 18.7 / 1.76 / 3.850 / 3.800 / 0.013 / clay / 46.70 / 45.40 / 0.029
Gál et al. (2007) / West Lafayette, IN, USA / (40°28'N; 86°56'W) / 934 / 10.6 / 1.29 / silt / 107.02 / 96.54 / 0.109
Halvorson et al. (2002) / Mandan, ND, USA / (46°49'N; 100°53'W) / 430 / 5.3 / 0.66 / 1.680 / 1.820 / -0.077 / silt loam / 68.55 / 77.10 / -0.111
Mandan, ND, USA / (46°49'N; 100°53'W) / 430 / 5.3 / 0.66 / 3.350 / 2.970 / 0.128 / silt loam / 75.24 / 70.39 / 0.069
Hermle et al. (2008) / Tänikon, Switzerland / (47°28'N; 8°54'E) / 1183 / 8.4 / 1.95 / sand / 52.86 / 56.13 / -0.058
Hernanz et al. (2002) / Alcalá de Henares, Spain / (40°29'N; 3°22'W) / 412 / 13.1 / 0.53 / 3.213 / 2.835 / 0.133 / silt loam / 36.80 / 35.13 / 0.048
Alcalá de Henares, Spain / (40°29'N; 3°22'W) / 412 / 13.1 / 0.53 / 1.575 / 1.638 / -0.038 / silt loam / 34.90 / 30.93 / 0.128
Huggins et al. (2007) / Waseca, MN, USA / (44°04'N; 93°32'W) / 823 / 6.3 / 1.32 / 6.643 / 6.429 / 0.033 / clay / 123.38 / 111.23 / 0.109
Waseca, MN, USA / (44°04'N; 93°32'W) / 823 / 6.3 / 1.32 / 5.714 / 5.571 / 0.026 / clay / 114.98 / 106.95 / 0.075
Waseca, MN, USA / (44°04'N; 93°32'W) / 823 / 6.3 / 1.32 / 3.429 / 3.571 / -0.040 / clay / 119.18 / 110.40 / 0.079
Ismail et al. (1994) / Lexington, KY, USA / (38°03'N; 84°29'W) / 1138 / 12.7 / 1.47 / 2.474 / 2.752 / -0.101 / silt / 55.40 / 48.85 / 0.134
Lexington, KY, USA / (38°03'N; 84°29'W) / 1138 / 12.7 / 1.47 / 3.901 / 3.925 / -0.006 / silt / 58.35 / 56.30 / 0.036
Lexington, KY, USA / (38°03'N; 84°29'W) / 1138 / 12.7 / 1.47 / 4.367 / 4.215 / 0.036 / silt / 58.90 / 56.40 / 0.044
Lexington, KY, USA / (38°03'N; 84°29'W) / 1138 / 12.7 / 1.47 / 3.762 / 3.750 / 0.003 / silt / 60.95 / 61.35 / -0.007
Continued
Table A.(Contd.)
Jantalia et al. (2007) / EMBRAPA Cerrados, Plantaltina, DF, Brazil / (15°35'S; 47°42'W) / 1524 / 20.6 / 1.73 / silt loam / 85.90 / 64.80 / 0.326
EMBRAPA Cerrados, Plantaltina, DF, Brazil / (15°35'S; 47°42'W) / 1524 / 20.6 / 1.73 / silt loam / 81.30 / 69.50 / 0.170
Jarecki & Lal (2005) / Geauga Farm, OH, USA / (41°29'N; 81°07'W) / 1043 / 8.4 / 1.55 / silt / 49.10 / 40.86 / 0.202
Kettler et al. (2000) / Sidney, NE, USA / (41°12'N; 103°W) / 410 / 9.0 / 0.65 / silt / 36.68 / 35.89 / 0.022
Sidney, NE, USA / (41°12'N; 103°W) / 410 / 9.0 / 0.65 / silt / 41.43 / 37.10 / 0.117
Mielke et al. (1986) / Elwood, IL, USA / (41°24'N; 88°05'W) / 888 / 9.6 / 1.27 / silt / 51.33 / 47.23 / 0.087
Lexington, KY, USA / (38°03'N; 84°29'W) / 1051 / 12.6 / 1.36 / silt / 62.03 / 54.07 / 0.147
Lincoln, NE, USA / (40°48'N; 96°42'W) / 812 / 10.4 / 1.09 / silt / 106.82 / 108.54 / -0.016
Sidney, NE, USA / (41°12'N; 103°W) / 443 / 8.5 / 0.71 / silt loam / 88.62 / 80.28 / 0.104
Sidney, NE, USA / (41°12'N; 103°W) / 443 / 8.5 / 0.71 / silt loam / 33.90 / 33.70 / 0.006
Müller et al. (2008) / Zollikofen, Switzerland / (46°59'N; 7°26'E) / 784 / 10.6 / 1.30 / silt loam / 111.87 / 109.41 / 0.023
Olson et al. (2005) / DeSoto, IL, USA / (37°48'N; 89°14'W) / 975 / 12.8 / 1.23 / silt loam / 38.95 / 29.15 / 0.336
Puget & Lal (2005) / Columbus, OH, USA / (40°04'N; 83°04'W) / 1014 / 10.8 / 1.42 / silt / 90.90 / 88.50 / 0.027
Sa et al. (2001) / Ponta Grossa, PN, Brazil / (24°36'S; 50°23'W) / 1532 / 16.5 / 1.95 / sand / 97.50 / 89.83 / 0.085
Sisti et al. (2004) / Passo Fundo, RS, Brazil / (28°15'S; 52°24'W) / 1686 / 18.8 / 1.91 / 3.400 / 3.200 / 0.062 / sand / 60.90 / 62.20 / -0.021
Passo Fundo, RS, Brazil / (28°15'S; 52°24'W) / 1686 / 18.8 / 1.91 / 4.490 / 4.150 / 0.082 / sand / 64.70 / 59.30 / 0.091
Passo Fundo, RS, Brazil / (28°15'S; 52°24'W) / 1686 / 18.8 / 1.91 / 4.470 / 4.280 / 0.044 / sand / 69.60 / 60.50 / 0.150
Thomas et al. (2007) / St George, QLD, Australia / (28°35'S; 148°49'E) / 620 / 19.8 / 0.64 / clay / 30.53 / 29.13 / 0.048
Ussiri & Lal (2009) / South Charleston, OH, USA / (39º45'N; 83º36'W) / 1037 / 10.8 / 1.54 / silt / 82.11 / 44.81 / 0.832
Venterea et al. (2006) / Rosemount, MN, USA / (44°45'N; 93°04'W) / 712 / 7.8 / 1.10 / silt / 100.56 / 101.95 / -0.014
Wander et al. (1998) / Perry, IL, USA / (39°47'N; 90°44'W) / 980 / 11.4 / 1.29 / silt / 29.76 / 26.78 / 0.111
Monmouth, IL, Usa / (40°55'N; 90°38'W) / 930 / 10.5 / 1.27 / silt / 57.84 / 45.63 / 0.268
DeKalb, IL, USA / (41°56'N; 88°55'W) / 940 / 8.8 / 1.40 / clay / 91.39 / 92.51 / -0.012
Wanniarachchi et al. (1999) / Delhi, ON, Canada / (42°52'N; 80°31'W) / 949 / 7.8 / 1.54 / 4.294 / 4.415 / -0.027 / sand / 95.32 / 101.36 / -0.060
Continued
Table A.(Contd.)
Yang et al. (2008) / Whelan Research Farm, ON, Canada / (42°18'N; 82°47'W) / 831 / 8.9 / 1.26 / clay / 65.57 / 65.88 / -0.005
Yang & Kay (2001) / Brady (Guelph), ON, Canada / (43°42'N; 80°18'W) / 943 / 6.7 / 1.61 / sand / 175.22 / 105.08 / 0.667
Fox (Guelph), ON, Canada / (43°42'N; 80°18'W) / 943 / 6.7 / 1.61 / sand / 127.63 / 112.92 / 0.130
Huron (Guelph), ON, Canada / (43°42'N; 80°18'W) / 943 / 6.7 / 1.61 / silt / 61.90 / 57.20 / 0.082
Yang & Wander (1999) / Urbana, IL, USA / (40°06'N; 88°12'W) / 954 / 10.8 / 1.30 / silt / 57.03 / 59.07 / -0.035

aDIrel: relative yearly C input differences between NT and IT plots: ((Inputs NT-Inputs IT)/Inputs IT).Organic C inputs calculated from crop yield or annual crop residue production (if not given by the authors), assuming a C content of 45% in the plant tissues. The conversion from grain yields was done using harvest indexes from Sisti et al. (2002).

bSOC stocks for an equivalent mass of that of the most compacted treatment at each site. Calculated from SOC concentration and bulk density data, if not provided by the authors.

cValues of P were calculated as the addition of natural precipitation and the irrigation water applied, using average irrigation doses given by the authors.

dTexture data from authors (Castellanos, personal communication)

MRCSP: Midwest Regional Carbon Sequestration Partnership.

References

Àlvarez R, Russo ME, Prystupa P, Scheiner JD, Blotta L (1998) Soil carbon pools under convencional and no-tillage systems in the Argentine rolling pampa. Agron J 90:138-143.

Black AL, Tanaka DL (1997) A conservation tillage-cropping systems study in the Northern Great Plains of the United States. In: Paul EA, Elliott ET, Paustian K, Cole CV (eds) Soil organic matter in temperate agroecosystems. Long-term experiments in North America. CRC Press, Boca Raton, Florida, pp 335-342.

Blanco-Canqui H, Lal R (2008) No-Tillage and soil-profile carbon sequestration: An on-farm assessment. Soil Sci Soc Am J. 72: 693-701.

Calegari A, Hargrove WL, Rheinheimer DDS, Ralisch R, Tessier D, de Tourdonnet S, Guimaraes MdF (2008) Impact of long-term no-tillage and cropping system management on soil organic carbon in an Oxisol: a model for sustainability. Agron J 100:1013-1019.

Carter MR (2005) Long-term tillage effects on cool-season soybean in rotation with barley, soil properties and carbon and nitrogen storage for fine sandy loams in the humid climate of Atlantic Canada. Soil Till Res 81:109-120.

Christopher SF, Lal R, Mishra U (2009)Regional study of no-till effects on carbon sequestration in the Midwestern United States. Soil Sci Soc Am J 73/207-216.

Dalal RC (1989) Long-term effects of no-tillage, crop residue, and nitrogen application on properties of a Vertisol. Soil Sci Soc Am J 53:1511-1515.

Deen W, Kataki PK (2003) Carbon sequestration in a long-term conventional versus conservation tillage experiment. Soil Till Res 74:143-150.

Diaz-Zorita M (1999) Six years of tillage in an Hapludoll from northwestern Buenos Aires, Argentina.. Ciencia del Suelo 17:31-36.

Dick WA, van Doren DM, Triplett GB, Henry JE (1986) Influence of long-term tillage and rotation combinations on crop yields and selected soil parameters. I. Results obtained for a Mollic Ochraqualf soil. Research Bulletin N° 1180, Ohio Agricultural Research and Development Center, Ohio State University, Wooster, Ohio.

Dolan MS, Clapp CE, Allmaras RR, Baker JM, Molina JAE (2006) Soil organic carbon and nitrogen in a Minnesota soil as related to tillage, residue and nitrogen management. Soil Till Res 8: 221-231.

Doran JW, Elliott ET, Paustian K (1998) Soil microbial activity, nitrogen cycling, and long-term changes in organic carbon pools as related to fallow tillage management. Soil Till Res 49:3-18.

Du Z, Ren T, Hu C (2010) Tillage and residue removal effects on soil carbonand nitrogen storage in the North China Plain. Soil Sci Soc Am J 74:196-202.

Follett RF, Castellanos JZ, Buenger ED (2005) Carbon dynamics and sequestration in an irrigated Vertisol in Central Mexico. Soil Till Res 83:148-158.

Gál A, Vyn TJ, Michéli E, Kladivko EJ, McFee WW (2007) Soil carbon and nitrogen accumulation with long-term no-till versus mouldboard plowing overestimated with tilled-zone sampling depths. Soil Till Res 96:42-51.

Halvorson AD, Wienhold BJ, Black AL (2002) Tillage, nitrogen, and cropping system effects on soil carbon sequestration. Soil Sci Soc Am J 66:906-912.

Hermle S, Anken T, Leifeld J, Weisskopf P (2008) The effect of the tillage system on soil organic carbon content under moist, cold-temperate conditions. Soil Till Res 98:94-105.

Hernanz JL, Lopez R, Navarrete L, Sanchez-Giron V (2002) Long-term effects of tillage systems and rotations on soil structural stability and organic carbon stratification in semiarid central Spain. Soil Till Res 66:129-141.

Huggins DR, Allmaras RR, Clapp CE, Lamb JA, Randall GW (2007) Corn-soybean sequence and tillage effects on soil carbon dynamics and storage. Soil Sci Soc Am J 71:145-154.

Ismail I, Blevins RL, Frye WW (1994) Long-term no-tillage effects on soil properties and continuous corn yields. Soil Sci Soc Am J 58:193-198.

Jantalia CP, Resck DVS, Alves BJR, Zotarelli L, Urquiaga S, Boddey RM (2007) Tillage effect on C stocks of a clayey Oxisol under a soybean-based crop rotation in the Brazilian Cerrado region. Soil Till Res 95:97-109.

Jarecki MK, Lal R (2005) Soil organic carbon sequestration rates in two long-term no-till experiments in Ohio. Soil Sci 170:280-291.

Kettler TA, Lyon DJ, Doran JW, Powers WL, Stroup WW (2000) Soil quality assessment after weed-control tillage in a no-till wheat-fallow cropping system. Soil Sci Soc Am J 64:339-346.

Mielke LN, Doran, JW, Richards KA. (1986). Physical environment near the surface of plowed and no-tilled soils. Soil Till Res 7:355-366.

Müller M, Schafflützel R, Chervet A, Sturny WG, Zihlmann U, Weisskopf P (2008) Teneurs en humus après onze ans de semis direct ou de labour. Rev Suisse Agric 40:5-10.

Olson KR, Langa JM, Ebelharb SA. (2005) Soil organic carbon changes after 12 years of no tillage and tillage of Grantsburg soils in southern Illinois. Soil Till Res 81:217-225.

Puget P, Lal R (2005) Soil organic carbon and nitrogen in a Mollisol in central Ohio as affected by tillage and land use. Soil Till Res 80:201-213.

Sa JCM, Cerri CC, Dick WA, Lal R, Venske Filho SP, Piccolo MC, Feigl BE (2001) Organic matter dynamics and carbon sequestration rates for a tillage chronosequence in a Brazilian Oxisol. Soil Sci Soc Am J 65:1486-1499.

Sisti CPJ, dos Santos HP, Kohhann R, Alves BJR, Urquiaga S, Boddey RM (2004) Change in carbon and nitrogen stocks in soil under 13 years of conventional or zero tillage in southern Brazil. Soil Till Res 76:39-58.

Thomas GA, Dalal RC, Standley J (2007No-till effects on organic matter, pH, cation exchange capacity and nutrient distribution in a Luvisol in the semi-arid subtropics. Soil Till Res 94:295-304.

Ussiri DAN, Lal R (2009) Long-term tillage effects on soil carbon storage and carbon dioxide emissions in continuous corn cropping system from an alfisol in Ohio. Soil Till Res 104:39-47.

Venterea RT, Baker JM, Dolan MS, Spokas KA (2006) Carbon and nitrogen storage are greater under biennial tillage in a Minnesota corn-soybean rotation. Soil Sci Soc Am J 70:1752-1762.

Wander MM, Bidart MG, Aref S (1998) Tillage impacts on depth distribution of total and particulate organic matter in three Illinois soils. Soil Sci Soc Am J 62:1704-1711.

Wanniarachchi SD, Voroney RP, Vyn TJ, Beyaert RP, MacKenzie AF (1999) Tillage effects on the dynamics of total and corn-reside-derived soil organic matter in two southern Ontario soils. Can J Soil Sci 79:463-480.

Yang XM, Drury CF, Reynolds WD, Tan CS (2008) Impacts of long-term and recently imposed tillage practices on the vertical distribution of soil organic carbon Soil Till Res 100:120-124.

Yang XM, Kay BD (2001) Impacts of tillage practices on total, loose- and occluded-particulate, and humified organic carbon fractions in soils within a field in southern Ontario. Can J Soil Sci 81:149-156.

Yang XM, Wander MM (1999) Tillage effects on soil organic carbon distribution and storage in a silt loam soil in Illinois. Soil Till Res 52:1-9.