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. 2013 Mar 1;96(1):85–94. doi: 10.3184/003685013X13587941096281

Utilisation of Biochar and Superabsorbent Polymers for Soil Amendment

MO Ekebafe a,*, LO Ekebafe b, M Maliki c
PMCID: PMC10365496  PMID: 23738439

Abstract

The application of superabsorbent polymers (SAPs) and/or biochars to stressed lands offer solutions to several critical ecological, energy and economic challenges posed by degraded lands due to human activities. These substances are like, ‘artificial humus’ as they are hydrophilic and contain carboxylic groups (SAPs) which enable them to bind cations and water, and sequester carbon from air to reverse global warming (biochars). Several research studies using these substances point to their ability to increase the plant-available water in the soil which enables the plants to survive longer with water shortage, increase soil fertility and agricultural yields, improve soil structure, aeration and water penetration, reduce use of synthetic fertilisers and pesticides, reduce nitrous oxide and methane emission from soil, reduce nitrate and farm chemicals leaching into watersheds, convert green and brown wastes into valuable resources, and reduce the evapotranspiration rate of the plants. SAPs and biochars induce a significantly higher growth rate in plants; they bind heavy metals and mitigate their action on plants as well as mitigate the effects of salinity. This paper reviews what is known about these claims and considers the wider environmental implications of the adoption of these processess. The intention is not just to summarise the current knowledge but also to identify gaps that require further research.

Keywords: stressed lands, biochars, superabsorbent polymers, soil amendment

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References

  • 1.An introduction to the United Nations Convention to combat desertification, UNCCD, Bonn: 2008. [Google Scholar]
  • 2.Lal R. (2007) Anthropogenic influences on world soils and implications to global food security. In: Sparks D.L. (ed.), Advances in agronomy, Vol. 93. Academic Press, San Diego. [Google Scholar]
  • 3.Sivakumar M. V. K., and Stefanski R. (2007). In: Sivakumar M.V.K., and Ndiangui N. (eds), Climate and land degradation, p. 105. Springer, Berlin. [Google Scholar]
  • 4.Bot A. J., Nachtergaele F. O., and Young A. (2000) Land resource potential and constraints at regional and country level. World Soil Resources Report 90, Land and Water Development Division, Food and Agriculture Organization of the United Nations, Rome. [Google Scholar]
  • 5.Lal R. (2001) Soil degradation by erosion. Land Degrad. Dev., 12, 519. [Google Scholar]
  • 6.Conacher A. (1998). In: Conacher A.J, and Sala M. (eds), Land degradation in Mediterranean environments of the world. nature and extent, causes and solutions, p. 175. John Wiley and Sons, Chichester. [Google Scholar]
  • 7.Mills A. J., and Fey M. V. (2004) Effects of vegetation cover on the tendency of soil to crust in South Africa. Soil Use Manage., 20, 308. [Google Scholar]
  • 8.Su Y. Z., Li Y. L., and Zhao H.L. (2006) Soil properties and their spatial pattern in a degraded sandy grassland under post-grazing restoration, Inner Mongolia, Northern China, Biogeochemistry, 79, 297. [Google Scholar]
  • 9.Veldkamp E. (1994) Organic carbon turnover in three tropical soils under pasture after deforestation. Soil Sci. Soc. Am. J., 58, 175. [Google Scholar]
  • 10.Stocking M. A. (2003) Tropical soils and food security: the next 50 years. Science, 302, 1356. [DOI] [PubMed] [Google Scholar]
  • 11.Ma Q. (2004) Appraisal of tree planting options to control desertification: experiences from three north-shelterbelt program. Int. Forest. Rev., 6, 327. [Google Scholar]
  • 12.Mekuria W. (2007) Effectiveness of exclosures to restore degraded soils as a result of overgrazing in Tigray, Ethiopia. J. Arid Environ., 69, 270. [Google Scholar]
  • 13.Dechert G., Veldkamp E., and Anas I. (2004) Is soil degradation unrelated to deforestation? Examining soil parameters of land use systems in Upland Central Sulawesi, Indonesia. Plant Soil, 265, 197. Global Planet. Change, 64, 169. [Google Scholar]
  • 15.Lehmann J., Kern D. C., Glaser B, and Woods W.I. (2003) Amazonian dark earths:origin, properties, management. Kluwer Academic Publishers, The Netherlands. [Google Scholar]
  • 16.Gaunt J., and Lehmann J. (2008) Energy balance and emissions associated with biochar sequestration and pyrolysis bioenergy production. Environ. Sci. Technol., 42, 4152–4158. [DOI] [PubMed] [Google Scholar]
  • 17.Wallace A. (1986) Polysaccharide (Guar) as soil conditioner. Soil Sci., 141, 371. [Google Scholar]
  • 18.Cheng C.H, Lehmann J., Thies J.E., and Burton S.D. (2008) Stability of black carbon in soils across a climatic gradient. J. Geophys. Res., 113, G02027 [Google Scholar]
  • 19.Lehmann J., da Silva J.P. Jr., Steiner C., Nehls T., Zech W., and Glaser B. (2003) Nutrient availability and leaching in an archaeological anthrosol and a ferralsol of the Central Amazon basin: fertiliser, manure and charcoal amendments. Plant Soil, 249, 343–357. [Google Scholar]
  • 20.Chan K.Y., Van Zwieten L., Meszaros I., Downie A., and Joseph S. (2007) Agronomic values of greenwaste biochar as a soil amendment. Austr. J. Soil Res., 45, 629–634A. [Google Scholar]
  • 21.Lehmann J., Gaunt J., and Rondon M. (2006) Bio-char sequestration in terrestrial ecosystems–a review. Mitigation and adaptation strategies for global change, Vol. 11, pp. 403–427. [Google Scholar]
  • 22.Ekebafe M.O. (2011) Effect of palm fronds and cow dung biochars on the properties of soil supporting the oil palm. J. Chem. Soc., 36(1), 122–129. [Google Scholar]
  • 23.Bicudo J.R., and Goyal S.M. (2003) Pathogens and manure management systems: A review. Environ Technol., 24, 115–130. [DOI] [PubMed] [Google Scholar]
  • 24.Ippolito J. et al. (2011) Western Nutrient Management Conf., Vol 9, Reno NV. [Google Scholar]
  • 25.Rhodes C.J. (2012) Sci. Prog., 95, 206–208. [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 26.Gaunt J., and Lehmann J. (2008) Energy balance and emissions associated with biochar sequestration and pyrolysis bioenergy production. Environ. Sci. Technol., 42, 4152–4158. [DOI] [PubMed] [Google Scholar]
  • 27.Zohuriaan-Mehr M.J., and Kabiri K. (2008) Superabsorbent polymer materials:a review. Iran. Polymer J., 17(6), 451–477. [Google Scholar]
  • 28.Ekebafe L. O., Ogbeifun D. E., and Okieimen F. E. (2011) Effect of native cassava starch-poly (sodium acrylate-co-acrylamide) hydrogel on the growth performance of maize (Zea may) seedlings. Am. J., Polym. Sci., 1(1), 1–6. [Google Scholar]
  • 29.Ekebafe L.O, Ogbeifun D. E., and Okieimen F. E. (2012): Effect of cassava starch hydrogel on the water requirement of maize (Zea may) seedlings and selected properties of sandy loam soil. Int. J. Basic Appl. Sci., 1(2), 132–139. [Google Scholar]
  • 30.Baydina N. L. (1996), Inactivation of heavy metals by humus and zeolites in industrially contaminated soils. Eurasian Soil Sci., 28, 96. [Google Scholar]
  • 31.Httermann A., Arduini I., and Godbold D. L. (2004) In: Prasad M.N.V. (ed.), Heavy metal stress in plants, from biomolecules to ecosystems, 2nd edn, p. 295. Springer-Verlag, Berlin. [Google Scholar]
  • 32.Herms U., and Brmmer G (1984), Einflußgr_ßen der Schwermetalll_slichkeit und -bindung an B_den, Z. Pflanz. Bodenkunde, 147, 400. [Google Scholar]
  • 33.Httermann A., and Zomorodi M. (1998) German Patent 19813425 A 1.
  • 34.Ekebafe L.O., Ogbeifun D.E., and Okieimen F.E. (2012) Removal of heavy metals from aqueous media using native cassava starch-poly (sodium acrylate-co-acrylamide) hydrogel. Macromolecules, 8(2), 42–47. [Google Scholar]
  • 35.Ekebafe L. O., Ogbeifun D. E., and Okieimen F. E. (2012) Removal of heavy metals from aqueous media using native cassava starch hydrogel. Afr. J. Environ. Sci. Technol., 6(7), 275–282. [Google Scholar]
  • 36.Torres A. M. O., and De Varennes A. (1998) Remediation of a sandy soil artificially contaminated with copper using a polyacrylate polymer. Soil Use Manage., 14, 106. [Google Scholar]
  • 37.DeVarennes A., and Torres M. O. (1999) Remediation of a long-term copper contaminated soil using a polyacrylate polymer. Soil Use Manage, 15, 230. [Google Scholar]
  • 38.DeVarennes A., and Queda C (2005) Application of an Insoluble polyacrylate polymer to copper-contaminated soil enhances plant growth and soil quality. Soil Use Manage., 21, 410. [Google Scholar]
  • 39.Grcman H., and Lestan D. (2003) Use of hydrogels in EDTA induced Pb phytoextraction. Fresenius Environ. Bull., 12, 1044. [Google Scholar]
  • 40.Kos B. Lestan, (2003) Influence of a biodegradable (S,S.-EDDS) and nNon-degradable (EDTA) chelate and hydrogel modified soil water sorption capacity on Pb phytoextraction and leaching. Plant Soil, 253, 403. [Google Scholar]
  • 41.Al-Omran A. M. (1991) Impact of gel conditioners and water salinity on intermittent evaporation. Egypt. J. Soil Sci., 31, 575. [Google Scholar]
  • 42.Hussain G., Al-Gosaibi A. M., and Badawi M. H. (1992) Effect of single salt solution on water absorption by gel-forming soil conditioners. Arid Soil Res. Rehabil., 6, 83. [Google Scholar]
  • 43.Chatzoudis G. K., and Rigas F. (1999) Soil salts reduce hydration of polymeric gels and affect moisture characteristics of soil. Commun. Soil Sci. Plant Anal., 30, 2465. [Google Scholar]
  • 44.Hüther A., Xu X., and Maurer G. (2006) Swelling of N-isopropyl acrylamide hydrogels in aqueous solutions of sodium chloride. Fluid Phase Equilib., 240, 186. [Google Scholar]
  • 45.Salem N (1991) Quality of irrigation waters and water uptake of a polyacrylamide hydrogel. Agrochimica, 35, 149. [Google Scholar]
  • 46.Salem N (1991) The use of a polyacrylamide hydrogel to improve the water-holding capacity of a sandy soil under different saline conditions. Agric. Mediterranean, 121, 160. [Google Scholar]
  • 47.Salem N, Pini R., Vigna G., and Guidi G.V. (1995) Evaporation loss from sandy soils mixed with a polyacrylamide hydrogel under different saline conditions. Agrochimica, 39, 334. [Google Scholar]
  • 48.Chen S.L. (2004), Hydrogel modified uptake of salt ions and calcium in populus euphratica under saline conditions. Trees Struct. Funct., 18, 175. [Google Scholar]
  • 49.Bowman D. C., Evans R. Y., and Paul J. L. (1990) Fertiliser salts reduce hydration of polyacrylamide gels and affect physical properties of gelamended container media. J. Am. Soc. HortScience, 115, 382. [Google Scholar]
  • 50.Bowman D. C., and Evans R. Y (1991) Calcium inhibition of polyacrylamide gel hydration is partially reversible by potassium. HortScience, 26, 1063. [Google Scholar]
  • 51.Henderson J. C., and Hensley D. L. (1985) Ammonium and nitrate retention by a hydrophilic gel. HortScience, 20, 667. [Google Scholar]
  • 52.Bres W., and Weston L. A. (1993) Influence of gel additives on nitrate, ammonia, and water retention and tomato growth in a soil-less medium. HortScience, 28, 1005. [Google Scholar]
  • 53.Chatzoudis G. K., and Valkanas G. N. (1995) Lettuce plant growth with the use of soil conditioner and slow release fertilizer. Commun. Soil Sci. Plant Anal., 26, 2569. [Google Scholar]
  • 54.Awad T., and Doering H.D. (1994) Mobilisation of nutrients from slow-release fertiliser as influenced by hydrogel and water quality. Agrochimica, 39, 123. [Google Scholar]
  • 55.Zhan F. (2004) Preparation of superabsorbent polymer with slow release phosphate fertilizer. J. Appl. Polym. Sci., 92, 3417. [Google Scholar]
  • 56.Liu M. (2006) Synthesis of a slow-release and superabsorbent nitrogen fertiliser and its properties. Polym. Adv. Technol., 17, 430. [Google Scholar]
  • 57.Rudzinski W. E. (2003) pH-sensitive acrylic-based copolymeric hydrogels for the controlled release of a pesticide and a micronutrient. J. Appl. Polym. Sci., 87, 394. [Google Scholar]
  • 58.Liu M. (2006) Synthesis of a slow-release and superabsorbent nitrogen fertiliser and its properties. Polym. Adv. Technol., 17, 430. [Google Scholar]
  • 59.Lan W., and Liu M (2007) Slow-release potassium silicate fertiliser with the function of superabsorbent and water retention. Ind. Eng. Chem. Res., 46, 6494. [Google Scholar]
  • 60.Abedi-Koupai J., Sohrab F., and Swarbrick G. (2008) Evaluation of hydrogel application on soil water retention characteristics. J. Plant Nutr., 31, 317. [Google Scholar]
  • 61.Lentz R. D., and Kinkaid D.C. (2008) Polyacrylamide treatments for reducing seepage in soil-lined reservoirs: a field evaluation. Trans. ASABE, 51, 535. [Google Scholar]
  • 62.Lentz R. D. (2007) Inhibiting water infiltration into soils with cross-linked polyacrylamide: Seepage reduction for irrigated agriculture. Soil Sci. Soc. Am. J., 71, 1352. [Google Scholar]
  • 63.Superabsorbent Super-Hydro-Grow made by Super Absorbent Co., www.superabsorbent.com
  • 64.Evenari M., Shanan L., and Tadmor N. (1971) The Negev, the challenge of a desert. Harvard University Press, Cambridge, MA. [Google Scholar]
  • 65.Agricultural Section, Web site of SNF Co., Agricultural Section, Technical data Sheet of Superabsorbent; www.snfgroup.com/IMG/pdf/Aquasorb_E.pdf
  • 66.Stahl J.D., Cameron M.D., Haselbach J., and Aust S.D. (2000) Biodegradation of superabsorbent polymers in soil. Environ. Sci. Pollut. Res., 7, 83–88. [DOI] [PubMed] [Google Scholar]
  • 67.Wallace A., Wallace G.A., and Abuzamzam A.M. (1986) Effects of a polymer as soil conditioner on yields and mineral nutrition of plants. Soil Sci., 143, 377–380. [Google Scholar]
  • 68.McGrath J. J. et al. (1993) Teratology study of a cross-linked polyacrylate superabsorbent polymer. J. Am. Coll. Toxicol., 12, 127. [Google Scholar]
  • 69.Haselbach J., Hey S., and Berner T (2000) Short-term oral toxicity study of FAVOR PAC in rats. Regul. Toxicol. Pharmacol., 32, 310. [DOI] [PubMed] [Google Scholar]
  • 70.Haselbach J. et al. (2000) Single-dose oral toxicity study of a cross-linked sodium polyacrylate/polyvinyl alcohol copolymer in chickens (Gallus domesticus). Regul. Toxicol. Pharmacol., 32, 332. [DOI] [PubMed] [Google Scholar]
  • 71.Hamilton J. D., Reinert K. H., and McLaughlin J. E. (1995) Aquatic risk assessment of acrylates and methacrylates in household consumer products reaching municipal waste-water treatment plants. Environ. Technol., 16, 715. [Google Scholar]
  • 72.Fiume M.Z. (2002) Final report on the safety assessment of acrylates copolymer and 33 related cosmetic ingredients. Int. J. Toxicol., 21, Suppl. 3, 1. [DOI] [PubMed] [Google Scholar]
  • 73.Garay-Jimenez J. C. et al. (2008) Methods for purifying and detoxifying sodium dodecyl sulfate-stabilised polyacrylate nanoparticles. Nanomedicine, 4, 98. [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 74.Diaz-Ravina M. R. et al. (2006) Microbial community structure in forest soils treated with a fire retardant. Biol. Fertil. Soils, 42, 465. [Google Scholar]
  • 75.Basanta M. R. et al. (2002) biochemical properties of forest soils as affected by a fire retardant. Biol. Fertil. Soils, 36, 377. [Google Scholar]
  • 76.Kay-Shoemaker J. L. et al. (1998) polyacrylamide as an organic nitrogen source for soil microorganisms with potential effects on inorganic soil nitrogen in agricultural soil. Soil Biol. Biochem., 30, 1045. [Google Scholar]
  • 77.Holliman P. J. et al. (2005) Model and field studies of the degradation of cross-linked polyacrylamide gels used during the revegetation of slate waste. Sci. Total Environ., 336, 13. [DOI] [PubMed] [Google Scholar]
  • 78.Sutherland G. R. J. et al. (1997) Biodegradation of cross-linked acrylic polymers by a white-rot fungus. Environ. Sci. Pollut. Res., 4, 16. [DOI] [PubMed] [Google Scholar]
  • 79.Stahl J. D. et al. (2000) Biodegradation of superabsorbent polymers in soil. Environ. Sci. Pollut. Res., 7, 83. [DOI] [PubMed] [Google Scholar]
  • 80.Wolter M. et al. (2002) Biological degradability of synthetic superabsorbent soil conditioners. Landbauforsch Volkenrode, 52, 43. [Google Scholar]

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