Nutrient Cycling in Agroecosystems

, Volume 62, Issue 1, pp 1–9 | Cite as

Nitrogen cycling assessment in a hedgerow intercropping system using 15N enrichment

  • Johannes Lehmann
  • Gerhard Gebauer
  • Wolfgang Zech
Article

Abstract

Nitrogen (N) cycling was determined in monocultures of Sorghumbicolor (L.) Moench and alley cropped sorghum with Acaciasaligna (Labill.) H. Wendl. in semiarid Northern Kenya. N inputthrough biological N2 fixation of the acacia, N transfer from thelegume to the intercrop and losses of applied N through harvest and leachingwere estimated using 15N enrichment. The biological N2fixation and N transfer estimates clearly demonstrated the limitations of15N enrichment techniques in field experiments showing even highertransfer than actually fixed N. Therefore, N transfer in the hedgerowintercropping system could not be determined by the 15N dilutionmethodology. The 15N balance approach, however, yielded reliableresults even 1.5 years after 15N application. 74 to 88% of theapplied 15N was recovered after three cropping cycles, most of it inthe soil (0–1.2 m). Only about 10% of the15N was taken up by the above-ground vegetation of both monocultureand agroforestry. The trees took up more of the applied 15N(8.4%) than the sorghum (1.3%) in the agroforestry system,indicating nutrient competition between tree and crop. Leaching losses below 1.2m depth were low in this semi-arid environment with 3 and 6%of the applied 15N in the monoculture and agroforestry system,respectively. 15N losses from leaching were 2.5 times higher in thealley than under the tree row. Incorporating the leguminous tree into thesorghum cropping system had no effect on total leaching and total uptake ofapplied 15N in above-ground biomass.

Acacia saligna Biological nitrogen fixation Leaching Roots Sorghum bicolor Woody legume 

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References

  1. Amara D.S., Sanginga N., Danso S.K.A. and Suale D.S. 1996. Nitrogen contribution by multipurpose trees to rice and cowpea in an alley cropping system in Sierra Leone. Agrofor. Syst. 34: 119–128.Google Scholar
  2. Boddey R.M., Oliveira O.C., Alves B.J.R. and Urquiaga S. 1995. Field application of the 15N isotope dilution technique for the reliable quantification of plant-associated biological nitrogen fixation. Fert. Res. 42: 77–87.Google Scholar
  3. Chalk P.M. 1985. Estimation of N2 fixation by isotope dilution: an appraisal of techniques involving 15N enrichment and their application. Soil Biol. Biochem. 17: 389–410.Google Scholar
  4. Chalk P.M. and Smith C.J. 1994. 15N isotope dilution methodology for evaluating the dynamics of biologically fixed N in legume-non-legume associations. Biol. Fert. Soils 17: 80–84.Google Scholar
  5. Danso S.K.A., Hardarson G. and Zapata F. 1993. Misconceptions and practical problems in the use of the 15N soil enrichment techniques for estimating N2 fixation. Plant and Soil 152: 25–52.Google Scholar
  6. Dakora F.D. and Keya S.O. 1997. Contribution of legume nitrogen fixation to sustainable agriculture in sub-saharan Africa. Soil Biol. Biochem. 29: 809–817.Google Scholar
  7. Droppelmann K.J. 1999. Resource Capture in a Runoff Agroforestry System in Northern Kenya Bayreuther. Bodenkundliche Berichte 63. University of Bayreuth, Germany, pp. 579–584.Google Scholar
  8. FAO 1990. Soil map of the world, revised legend. FAO, Rome, Italy.Google Scholar
  9. Haggar J.P., Tanner E.V.J., Beer J.W. and Kass D.C.L. 1993. Nitrogen dynamics of tropical agroforestry and annual cropping systems. Soil Biol. Biochem. 25: 1363–1378.Google Scholar
  10. Hardarson G., Danso S.K.A. and Zapata F. 1988. Dinitrogen fixation measurements in alfalfa ryegrass swards using nitrogen-15 and influence of the reference crop. Crop. Sci. 28: 101–105.Google Scholar
  11. Hartemink A.E., Buresh R.J., Bashir-Jam and Janssen B.H. 1996. Soil nitrate and water dynamics in sesbania fallow, weed fallow, and maize. Soil Sci. Soc. Am. J. 60: 568–574.Google Scholar
  12. Ladha J.K., Peoples M.B., Garrity D.P., Capuno V.T. and Dart P.J. 1993. Estimating dinitrogen fixation of hedgerow vegetation using the nitrogen-15 natural abundance method. Soil Sci. Soc. Am. J. 34: 13–25.Google Scholar
  13. Ledgard S.F. 1989. Nutrition, moisture and rhizobial strain influence isotopic fractionation during N2 fixation in pasture legumes. Soil Biol. Biochem. 21: 65–68.Google Scholar
  14. Lehmann J. and Zech W. 1998. Fine root turnover in hedgerow intercropping in Northern Kenya. Plant and Soil 198: 19–31.Google Scholar
  15. Lehmann J., Droppelmann K. and Zech W. 1998a. Runoff irrigation of crops with contrasting root and shoot development in the semi-arid North of Kenya: water depletion and above-and below-ground biomass production. J. Arid. Environm. 38: 479–492.Google Scholar
  16. Lehmann J., Peter I., Steglich C., Gebauer G., Huwe B. and Zech W. 1998b. Below-ground interactions in dryland agroforestry. For Ecol. Manage. 111: 157–169.Google Scholar
  17. Lehmann J., Weigl D., Droppelmann K., Huwe B. and Zech W. 1999a. Nutrient cycling in agroforestry with runoff irrigation. Agrofor. Syst. 43: 49–70.Google Scholar
  18. Lehmann J., Weigl D., Peter I., Droppelmann K., Gebauer G., Goldbach H. et al. 1999b. Nutrient interactions of alley-cropped Sorghum bicolor and Acacia saligna in a runoff irrigation system in Northern Kenya. Plant and Soil 210: 249–262.Google Scholar
  19. Little T.M. and Hills F.J. 1978. Agricultural Experimentation. Wiley and Sons, New York, USA.Google Scholar
  20. Mekonnen K., Buresh R.J. and Jama B. 1997. Root and inorganic nitrogen distributions in sesbania fallow, natural fallow and maize fields. Plant and Soil 188: 319–327.Google Scholar
  21. Ndoye I., Gueye M., Danso S.K.A. and Dreyfus B. 1995. Nitrogen fixation in Faidherbia albida, Acacia raddiana, Acacia senegal and Acacia seyal estimated using the 15N isotope dilution technique. Plant and Soil 172: 175–180.Google Scholar
  22. Nygren P. and Ramirez C. 1995. Production and turnover of N2 fixing nodules in relation to foliage development in periodically pruned Erythrina poeppigina (Leguminosae) trees. For Ecol. Manage. 73: 59–73.Google Scholar
  23. Palm C.A. 1995. Contribution of agroforestry trees to nutrient requirements of intercropped plants. Agrofor. Syst. 30: 105–124.Google Scholar
  24. Sanchez P.A. 1976. Properties and Management of Soils in the Tropics. John Wiley and Sons, New York, USA.Google Scholar
  25. Sanginga N., Mulongoy K. and Ayanaba A. 1988. Nitrogen contribution of Leucaena/Rhizobium symbiosis to soil and subsequent maize crop. Plant and Soil 112: 137–141.Google Scholar
  26. Sanginga N., Vanlauwe B. and Danso S.K.A. 1995. Management of biological N2 fixation in alley cropping systems: Estimation and contribution to N balance. Plant and Soil 174: 119–141.Google Scholar
  27. Schroth G. 1995. Tree root characteristics as criteria for species selection and systems design in agroforestry. Agrofor Syst 30: 125–143.Google Scholar
  28. Seyfried M.S. and Rao P.S.C. 1991. Nutrient leaching loss from two contrasting cropping systems in the humid tropics. Tropical Agriculture (Trinidad) 68: 9–18.Google Scholar
  29. Srivastava A.K. and Ambasht R.S. 1994. Soil moisture control of nitrogen fixation activity in dry tropical casnarina plantation Forest. J. Environm. Manage. 41: 49–54.Google Scholar
  30. Van Noordwijk M., Lawson G., Soumare A., Groot J.J.R. and Hairiah K. 1996. Root distribution of trees and crops: competition and/or complementarity. In: Ong C.K. and Huxley P. (eds), Tree-Crop Interactions. CAB International, Oxon, UK, pp. 319–364.Google Scholar
  31. Viera-Vargas M.S., Souto C.M., Urquiaga S. and Boddey R.M. 1995. Quantification of the contribution of N2 fixation to tropical forage legumes and transfer to associated grass. Soil. Biol. Biochem. 27: 1193–1200.Google Scholar
  32. Vlek P.L.G., Fillery I.R.P. and Burford J.R. 1981. Accession, transformation, and loss of nitrogen in soils of the arid region. Plant and Soil 58: 133–175.Google Scholar
  33. Wild A. 1988. Russell's Soil Conditions and Plant Growth. Longman, New York, USA.Google Scholar
  34. Witty J.F. 1983. Estimating N2-fixation in the field using 15N-labelled fertilizer: some problems and solutions. Soil Biol. Biochem. 15: 631–639.Google Scholar
  35. Wulf S., Lehmann J. and Zech W. 1999. Emissions of nitrous oxide from runoff-irrigated and rainfed soils in semiarid northwest Kenya. Agric. Ecosys. Environm. 72: 201–205.Google Scholar

Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Johannes Lehmann
    • 1
  • Gerhard Gebauer
    • 2
  • Wolfgang Zech
    • 1
  1. 1.Institute of Soil Science and Soil GeographyUniversity of BayreuthBayreuthGermany
  2. 2.Institute of Plant EcologyUniversity of BayreuthBayreuthGermany

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