AIMS Energy, 2016, 4(4): 633-657. doi: 10.3934/energy.2016.4.633.

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Long-term bioenergy sorghum harvest strategy and soil quality

1 Department of Soil and Crop Sciences, Texas A&M University, College Station, Texas, USA
2 Environmental Studies Department, College of St. Benedict & St. John’s University, Collegeville, MN, USA
3 Department of Plant Science and Landscape Architecture, University of Maryland, College Park, Maryland, USA

A long-term study was initiated in 2008 to determine effects of bioenergy sorghum [Sorghum bicolor (L.) Moench.] production on soil quality. Sorghum biomass removal may potentially deteriorate soil quality and productivity through nutrient removal and decreased organic matter return. Study treatments included continuous bioenergy sorghum and a sorghum/corn (Zea mays L.) biannual rotation, 0, 25, or 50% return of harvested sorghum biomass, no or non-limiting N addition, and a complete nutrient return treatment. The study was conducted near College Station, TX on Weswood silty clay loam soil. Soil quality indicators including soil organic carbon (SOC), total soil nitrogen (TSN), and soil C:N ratio were determined in soil samples collected annually at five depth increments to 90 cm for seven years (2009–2015) and compared to initial values in 2008. The greatest sorghum biomass yield increase from residue return was observed with 25% return and N fertilization. Nitrogen was essential for biomass and biomass C yield for both sorghum cropping systems, especially continuous sorghum. Increasing residue return from 25 to 50% tended to increase SOC in the near surface regardless of N addition, but generally not with depth. From the initial year in 2008 to 2015, SOC increased at all soil depths, except 15–30 cm, under continuous sorghum receiving residue return and N fertilization. Increases in SOC were much higher with continuous than rotated sorghum. For example, SOC storage for fertilized rotated sorghum averaged across residue return rates increased by 10% (59.4 to 65.1 Mg ha−1) and for continuous sorghum by 51% (59.4 to 90.1 Mg ha−1) by 2015 compared to initial values in 2008. For both continuous and rotated sorghum, changes in SOC stocks were greater in lower depths, principally at 30–60 and 60–90 cm, implying that SOC increases at these depths were most likely associated with bioenergy sorghum roots. After seven years of 25% residue return, SOC increased by 1.75, 5.25, 15.4, 32.9, and 39.2 Mg ha−1, respectively, at 0–5, 0–15, 0–30, 0–60, and 0–90 cm. Total soil N to 90 cm depth tended to follow similar patterns as those observed for SOC storage. Soil C:N ratio also tended to increase in all depth increments with residue return, but especially in the surface 0–5 cm with N fertilization. The highest C:N ratio increase were observed in surface soil under continuous sorghum at 25 and 50% residue return rates with or without N fertilization. Increased soil C:N at deeper depths in continuous sorghum was probably associated with sorghum roots. The return of 25% of aboveground biomass from a continuous sorghum cropping system in conjunction with N fertilization appeared feasible for maintaining soil quality in the long term.
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Keywords Sorghum bicolor (L.) Moench; bioenergy sorghum; biomass; soil quality; residue return; soil organic C; total soil N; soil C:N ratio

Citation: Hamid Shahandeh, Frank M. Hons, Joseph O. Storlien, Jason P. Wight. Long-term bioenergy sorghum harvest strategy and soil quality. AIMS Energy, 2016, 4(4): 633-657. doi: 10.3934/energy.2016.4.633


  • 1. Rooney WL, Blumenthal J, Bean B, et al. (2007) Designing sorghum as a dedicated bioenergy feedstock. Biofuel Bioprod Bior 1: 147−157.
  • 2. Manatt RK, Hallam A, Schulte LA, et al. (2013) Farm-scale costs and returns for second generation bioenergy cropping systems inthe US Corn Belt. Environ Res Letters 8: 035037.    
  • 3. Storlien JO, Hons FM, Wight JP, et al. (2014) Carbon dioxide and nitrous oxide emissions impacted by bioenergy sorghum management. Soil Sci Soc Am J doi: 10.2136/sssaj2014.04.0176.
  • 4. Tilman D, Socolow R, Foley JA, et al. (2009) Beneficial biofuels—the food, energy, and environment trilemma. Science 325: 270–271.    
  • 5. Gill JR, Burks PS, Staggenborg SA et al. (2014) Yield results and stability analysis from the sorghum regional biomass feedstock trial. Bioenerg Res 7: 1026–1034.    
  • 6. Blanco-Canqui H (2013) Crop residue removal for bioenergy reduces soil carbon pools: How can we offset carbon losses. Bioenerg Res 6: 358–371.    
  • 7. Wilhelm WW, Johnson JM, Hatfield JL, et al. (2004) Crop and soil productivity response to corn residue removal: a literature review. Agron J 96: 1–17.    
  • 8. Gollany HT, Rickman RW, Liang Y, et al. (2011) Predicting agricultural management influence on long-term soil organic carbon dynamics: implications for biofuel production. Agron J 103: 234–24618.    
  • 9. Muth DJ, Bryden KM, Nelson RG (2013) Sustainable agricultural residue removal for bioenergy: A spatially comprehensive U.S. national assessment. Appl Energy 102: 403–417.
  • 10. Stewart CE, Follett RF, Pruessner EG, et al. (2015) Nitrogen and harvest effects on soil properties under rainfed switchgrass and no-till corn over 9 years: Implications for soil quality. GCB Bioenergy 7: 288–301.    
  • 11. USDA NRCS (USDA Natural Resources Conservation Service) (2006) Crop residue removal for biomass production: effects on soils and recommendations. Soil quality-Agronomy Technical Note No. 19.
  • 12. Meki MN, Kemanian AR, Potter SR, et al. (2013a) Cropping system effects on sorghum grain yield, soil organic carbon, and global warming potential in central and south Texas. Agr Systems 117: 19–29.
  • 13. Meki MN, Snider JL, Kiniry JR, et al. (2013b) Energy sorghum biomass harvest threshold and tillage effects on soil organic carbon and bulk density. Ind Crops Prod 43: 172–182.
  • 14. Reijnders L (2013) Sustainability of soil fertility and the use of lignocellulosic crop harvest residues for the production of biofuels: a literature review. Environ Tech 34: 1725–1734.    
  • 15. Nelson RG, Tatarko J, Ascough JC II (2015) Soil erosion and organic matter variations for central Great Plains cropping systems under residue removal. Transactions ASABE 58: 415–427.
  • 16. Reeves DW (1997) The role of soil organic matter in maintaining soil quality in continuous cropping systems. Soil Till Res 43: 131–167.    
  • 17. Liu X, Herbert SJ, Hashemi AM, et al. (2006) Effects of agricultural management on soil organic matter and carbon transformation—a review. Plant Soil Environ 52: 531–543.
  • 18. Baker JM, Ochsner TE, Venterea RT, et al. (2007) Tillage and soil carbon sequestration - What do we really know? Agr Ecosyst Environ 118: 1–5.    
  • 19. Follett RF, Vogel KP, Varvel GE, et al. (2012) Soil carbon sequestration by switchgrass and no-till maize grown for bioenergy. Bioenerg Res 5: 866–875.    
  • 20. Gollany HT, Novak JM, Liang Y, et al. (2010) Simulating soil organic carbon dynamics with residue removal using the CQESTR model. Soil Sci Soc Am J 74: 372–383.    
  • 21 West TO, Post W (2002) Soil organic carbon sequestration rates by tillage and crop rotation: A global data analysis. Soil Sci Soc Am J 66: 1930–1946.    
  • 22. Dou F, Hons FM (2006) Tillage and nitrogen effects on soil organic matter fractions in wheat-based systems. Soil Sci Soc Am J 70: 1896–1905.    
  • 23. Dou F, Wright AL, Hons FM (2008) Sensitivity of labile soil organic carbon to tillage in wheat-based cropping systems. Soil Sci Soc Am J 72: 1445–1453.    
  • 24. Shahandeh H, Hons FM, Wight JP, et al. (2015) Harvest strategy and N fertilizer effects on bioenergy sorghum production. AIMS Energy 3: 377–400.    
  • 25. Lal R (2009) Soil quality impacts of residue removal for bioethanol production. Soil Till Res 102: 233–241.    
  • 26. Somerville C, Youngs H, Taylor C, et al. (2010) Feedstocks for lignocellulosic biofuels. Science 329: 790–792.    
  • 27. Kirkby CA, Richardson AE, Wade LJ, et al. (2014) Nutrient availability limits carbon sequestration in arable soils. Soil Biol Biochem 68: 402–409.    
  • 28. Dalzell BJ, Johnson JMF, Tallaksen J, et al. (2013) Simulated impacts of crop residue removal and tillage on soil organic matter maintenance. Soil Sci Soc Am J 77: 1349–1356    
  • 29. Blanco-Canquil H, Lal R (2007) Soil and crop response to harvesting corn residues for biofuel production. Geoderma 141: 355–362.    
  • 30. Graham RL, Nelson R, Sheehan R, et al. (2007) Current and potential U.S. corn stover supplies. Agron J 99: 1–11.
  • 31. Anderson-Teixeira KJ, Davis SC, Masters MD (2009) Changes in soil organic carbon under biofuel crops. GCB Bioenerg 1: 75–96.    
  • 32. Johnson JM, Novak JM, Varvel GE, et al. ( 2014). Crop residue mass needed to maintain soil organic carbon levels: can it be determined? Bioenerg Res 7: 481–490.
  • 33. Wilhelm WW, Johnson JM, Karlen DL, et al. (2007) Corn stover to sustain soil organic carbon further constrains biomass supply. Agron J 99: 1665–1667.    
  • 34. Johnson JD, Allmaras D, Reicosky RR (2006) Estimating source carbon residues, root and rhizodeposits using the national grain—yield database. Agron J 98: 622–636.    
  • 35. HalvorsonAD, WienholdBJ, Black AL (2002) Tillage, nitrogen, and cropping system effects on soil carbon sequestration. Soil Sci Soc Am J 66 : 906–912.
  • 36. Blanco-Canqui H, Lal R (2009) Crop residue management and soil carbon dynamics, In: Lal R, Follett RF, Soil carbon sequestration and the greenhouse effect: SSSA Special Publication 57. 2nd ed. ASA, and SSSA, Madison, WI, 291–309.
  • 37. Halvorson AD, Schlege AJ (2012) Crop rotation effect on soil carbon and nitrogen stocks under limited irrigation. Agron J 104: 1265–1273.    
  • 38. Sainju UM, Singh HP, Singh BP (2015) Cover crop effects on soil carbon and nitrogen under bioenergy sorghum crops. J Soil Water Conserv 70: 410–417.
  • 39. Anderson-Teixeria KJ, Masters MD, Black CK, et al. (2013) Altered belowground carbon cycling, following land-use change to perennial bioenergy crops. Ecosyst DOI 10. 1007/s10021-021-9628-x.
  • 40 Mazzilli SR, Kemanian AR, Ernst OR, et al. (2015) Greater humification of belowground than aboveground biomass carbon into particulate soil organic matter in no-till corn and soybean crops. Soil Biol Biochem 85: 22–30.    
  • 41. Flesa H, Ludwiso B, Heil B, et al. (2000) The origin of soil organic C, dissolved organic C and respiration in a long term maize experiment in Halle, Germany determined by 13C natural abundance. J Plant Nutr Soil Sci 163: 157–163.    
  • 42. Wilts AR, Reicosky DC, Allmaras RR, et al. (2004) Long-term corn residue effects: harvest alternatives, soil carbon turnover, and root-derived carbon. Soil Sci Soc Am J 68: 1342–1351.    
  • 43. Liebig MA, Schmer MR, Vogel KP, et al. (2008) Soil carbon storage by switchgrass grown for bioenergy. Bioenerg Res 1: 215–222.    
  • 44. Schmidt MWI, Torn MS, Abiven S, et al. (2011) Persistence of soil organic matter as an ecosysytem property. Nature 478: 49–56.    
  • 45. Wight JP, Hons FM, Storlien JO, et al. (2012). Management effects on bioenergy sorghum growth, yield and nutrient uptake. Biomass Bioenerg 46: 593–604.    
  • 46. Adams, WA (1973) The effect of organic matter on the bulk and true densities of some uncultivated podzolic soils. J Soil Sci 24: 10–17.    
  • 47. Franzluebbers AJ, Hons FM, Zuberer DA (1995) Tillage and crop effects on seasonal dynamics of soil CO2 evolution, water content, temperature, and bulk density. Appl Soil Ecol 2: 95–109.    
  • 48 Schulte EE, Hopkins BG (1996) Estimation of soil organic matter by weight loss-on-ignition. In Soil organic matter: analysis and interpretation. Madison, WI, U.S.A. Soil Sci Soc Am p 21–27.
  • 49 Hons FM, Wright AL, Kolodziej SM, et al., (2004) Rotation, tillage, and nitrogen rate effects on cotton growth and yield. In: Proceedings of Annual Beltwide Cotton Conference. January 2004, San Antonio, TX.
  • 50 Barber SA (1972) Relation of weather to the influence of hay crops on subsequent corn yields on a Chalmers silt loam. Agron J 64: 8–10.    
  • 51. Cook RJ (1984) Root health: Importance and relationship to farming practices. In Organic Farming: Current Technology and Its Role in a Sustainable Agriculture. Eds. Bezdicek DF, Powers JF. pp 111-127. Am. Soc. Agron. Special Publ. 46. Am. Soc. Agron., Madison, WI.
  • 52. Jawson MD, Franzluebbers AJ, Galusha DK, et al. (1993) Soil fumigation within monoculture and rotations: Response of corn and mycorrhizae. Agron J 85: 1174–1180.    
  • 53. Turco R F, Bischoff M, Breakwell DP, et al. (1990) Contribution of soil-borne bacteria to the rotation effect in corn. Plant Soil 122: 115–120.
  • 54. Whiting KR, Crookston RK (1993) Host-specific pathogens do not account for the corn-soybean rotation effect. Crop Sci 33: 539–543.    
  • 55. Weston LA, Alsaadawi IS, Baerson SR (2013) Sorghum allelopathy—from ecosystem to molecule. J Chem Ecol DOI 10.1007/s10886-013-0245-8.
  • 56. Dou F, Wight JP, Wilson LT, Storlien JO, et al. (2014) Simulation of biomass yield and soil organic carbon under bioenergy sorghum production. PLoS ONE 9(12): e115598. doi: 10.1371/journal.pone.0115598.
  • 57. Hao B, Xue Q, Bean BW, et al. (2014) Biomass production, water and nitrogen use efficiency in photoperiod-sensitive sorghum in the Texas High Plains. Biomass Bioenerg 62: 108–116.
  • 58. Cadoux S, Ferchaud F, Demay C, et al. (2014) Implication of productivity and nutrient requirements on greenhouse gas balance of annual and perennial bioenergy crops. GCB Bioenerg 6: 425–438.    
  • 59. Halvorson AD, Stewart CE (2015) Stover removal affects no-till irrigated corn yields, soil carbon, and nitrogen. Agron J 107: 1504–1512.    
  • 60. Cai M, Dong Y, Chen Z, et al. (2015) Effects of nitrogen fertilizer on the composition of maize roots and their decomposition at different soil depths. Eur J Soil Biol 67: 43–50.69.
  • 61. Follett RF (2001) Soil management concepts and carbon sequestration in cropland soils. Soil Till Res 61: 77–92.    
  • 62. Franzluebbers AJ (2010) Achieving soil organic carbon sequestration with conservation agricultural systems in the Southeastern United States. Soil Sci Soc Am J 74: 347–357.    
  • 63. Zhang P, Wei T, Li Y, et al. (2015) Effects of straw incorporation on stratification of the soil organic C, total N and C: N ratio in a semiarid region of China. Soil Till Res 153: 28–35.    
  • 64. Varvel GE, Wilhelm WW (2011) No-tillage increases soil profile carbon and nitrogen under long-term rainfed cropping systems. Soil Till Res 114: 28–36.    
  • 65. Clapp, CE, Allmaras RR, Layese ME, et al. (2000) Soil organic carbon and 13C abundance as related to tillage, crop residue, and nitrogen fertilization under continuous corn management in Minnesota. Soil Till Res 55: 127–142.    
  • 66. Muller K, Kramer S, Haslwimmer H (2016) Carbon transfer from maize roots and litter into bacteria and fungi depends on soil depth and time. Soil Biol Biochem 93: 79–89.    
  • 67. Menichetti L, Ekblad A, Katterer T (2015) Contribution of roots and amendments to soil carbon accumulation within the soil profile in a long-term field experiment in Sweden. Agr Ecosyst and Environ 200: 79–87.    
  • 68. Ontl AT, Hofmockel KS, Cambardella, CA, et al. (2013) Topographic and soil influences on root productivity of three bioenergy cropping systems. New Phytologist 199: 727–737.    
  • 69. Bai WM, Zhou M, Fang Y, et al. (2015) Differences in spatial and temporal root lifespan of temperate steppes across Inner Mongolia grasslands. Biogeosciences Discuss 12: 19999–20023.    
  • 70. Richter GM, Agostini F, Redmile-Gordon M, et al. (2015) Sequestration of C in soils under Miscanthus can be marginal and is affected by genotype-specific root distribution. Agr Ecosyst Environ 200: 169–177.    
  • 71. Hendricks JJ, Hendrick RL, Wilson CA, et al. (2006) Assessing the patterns and controls of fine root dynamics: an empirical test and methodological review. J Ecol 94: 40–57.    
  • 72. Lemus R, Lal R (2005): Bioenergy crops and carbon sequestration. Crit Rev Plant Sci 24: 1–21.
  • 73. Khan SA, Mulvaney RL, Ellsworth TR, et al. (2007) The myth of nitrogen fertilization for soil carbon sequestration. J Environ Qual 36: 1821–1832.    
  • 74. Li W, Jin C, Guan D, et al. (2015) The effects of simulated nitrogen deposition on plant root traits: a meta-analysis. Soil Biol Biochem 82: 112–118.    
  • 75. Veenstra JJ, Burras CL (2015) Soil profile transformation after 50 years of agricultural land use. Soil Sci Soc Am J 79: 1154–1162.    
  • 76. Ostrowska A, Porebska G (2015) Assessment of the C/N ratio as an indicator of the decomposability of organic matter in forest soils. Ecol Indicators 49: 104–109.    
  • 77. Langdale GW, Hargrove WL, Giddens J (1984) Residue management in double-crop conservation tillage systems. Agron J 76: 689–694.
  • 78. Gal A, Vyn TJ, Micheli E, et al. (2007) Soil carbon and nitrogen accumulation with long term no till versus moldboard plowing overestimated with tilled-zone sampling depths. Soil Till Res 96: 42–51.    


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