Some Analytical Variations for Intercropping Studies

  • Walter T. Federer
Part of the Springer Series in Statistics book series (SSS)


A number of variations of statistical design and analyses have been found in the published literature and are discussed in this chapter. The first topic discussed is a replacement series wherein the ratio of one crop to a second varies from zero to one. In this set-up, a land equivalent ratio (LER) approaches one as the proportion of a crop approaches unity. Some statistical analyses are presented for a set of data involving two wheat varieties where their proportions vary from zero to one.


Actual Yield Maize Yield Replacement Series Sole Crop Maize Cultivar 
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Literature Cited

  1. de Wit, C.T. (1960). On competition. Versl. Landbouwk. Onderzoek 66, 1–82.Google Scholar
  2. de Wit, C.T. and J.P. van den Bergh (1965). Competition among herbage plants. Netherlands J. Agric. Sci. 13, 212–221.Google Scholar
  3. Donald, C.M. (1963). Competition among crop and pasture plants. Adv. Aqronomy 15, 1–118.CrossRefGoogle Scholar
  4. Federer, W.T. and B.T. Scully (1988). A parsimonious statistical design and breeding procedure for evaluating and selecting desirable characteristics over environments. BU-960-M in the Biometrics Unit Technical Report Series, Cornell University, Ithaca, NY.Google Scholar
  5. Francis, C.A. and J.H. Sanders (1978). Economic analyses of beans and maize systems: Monoculture versus associated cropping. Field Crops Res. (Netherlands) 1, 319-335.CrossRefGoogle Scholar
  6. Gahlot, K.N.S., R. Vishal, and S.J. Vishwa Karma (1978). Urd “T.9” as intercrop with arhar “T.21”. Indian Farming 27, 7–8.Google Scholar
  7. Hall, R.L. (1974). Analysis of the nature of interference between plants of different species. 1. Concepts and extension of de Wit analysis to examine effects. 2. Nutrient relations in a Nandi Setaria and Greenleaf Desmodium with particular reference to potassium. Austral. J. Agric. Res. 25, 739–756.CrossRefGoogle Scholar
  8. Lal, D.N. (1979). A note on an index of utility of mixed cropping and allocation of such areas under separate crops. J. Indian Soc. Agric. Statist. XXXI, 59–64.Google Scholar
  9. Lin, C.S., M.R. Binns, and L.P. Lefkovitch (1986). Stability analysis: Where do we stand? Crop Sci. 26, 894–900.CrossRefGoogle Scholar
  10. McGilchrist, C.A. (1965). Analysis of competition experiments. Biometrics 21, 975–985.CrossRefGoogle Scholar
  11. McGilchrist, C.A. and B.R. Trenbach (1971). A revised analysis of plant competition experiments. Biometrics 27, 659–671.CrossRefGoogle Scholar
  12. Mead, R. and J. Riley (1981). A review of statistical ideas relevant to intercropping research (with discussion). J. Roy. Statist. Soc., Series A, 144, 462–509.CrossRefGoogle Scholar
  13. Pearce, S.C. and R.N. Edmondson (1982). Historical data as a guide to selecting systems for intercropping two species. Experimental Agric. 18, 353–362.CrossRefGoogle Scholar
  14. Rao, M.R. and R.W. Willey (1980). Evaluation of yield stability in intercropping: Studies on sorghum/pigeonpea. Experimental Agric. 16, 105–112.CrossRefGoogle Scholar
  15. Spurling, A.T. (1973). Field trials with Canadian Wonder Beans in Malawi. Experimental Agric. 9, 97–105.CrossRefGoogle Scholar
  16. Wahua, T.A.T. and D.A. Miller (1978). Relative yield totals and yield components of intercropped sorghum and soybean. Agronomy J. 70, 287–291.CrossRefGoogle Scholar
  17. Willey, R.W. (1979). Intercropping—its importance and research needs. Part 1. Competition and yield advantages. Part 2. Agronomy and research approaches. Field Crops Abstracts 32, 1–10 and 73–85.Google Scholar
  18. Willey, R.W. and M.R. Rao (1980). A competitive ratio for quantifying competition between intercrops. Experimental Agric. 16, 117–125.CrossRefGoogle Scholar
  19. Williams, E.J. (1962). The analysis of competition experiments. Austral. J. Biological Sci. 15, 509–525.Google Scholar

Copyright information

© Springer-Verlag New York, Inc. 1993

Authors and Affiliations

  • Walter T. Federer
    • 1
  1. 1.Biometrics UnitCornell UniversityIthacaUSA

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