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Agroforestry Systems

, Volume 6, Issue 1–3, pp 37–48 | Cite as

Modelling agroforestry systems of cacao (Theobroma cacao) with laurel (Cordia alliodora) and poro (Erythrina poeppigiana) in Costa Rica II. Cacao and wood production, litter production and decomposition

  • J. Heuveldop
  • H. W. Fassbender
  • L. Alpízar
  • G. Enríquez
  • H. Fölster
Article

Abstract

During 7 years (1979–1985) cacao harvests (beans and husks) have been recorded for the agroforestry systems ofTheobroma cacao underCordia alliodora andErythrina poeppigiana shade trees. The mean oven dry cacao yields were 626 and 712 kg.ha−1.a−1 cocoa beans underC. alliodora andE. poeppigiana respectively. Harvests have gradually increased over the years and the plantation has now reached maturity.

Annual extraction of N, P, K, Ca and Mg in fruits, which is relatively small, was calculated on the basis of chemical analyses. The following average values were found (kg.ha−1.a−1):

At the age of 8 years, theC. alliodora trees have reached 26.7 cm diameter (DBH) and 14.0 m in height. Mean annual growth (from age 5 to 7) is 14.6 m3.ha−1.a−1.

Natural plant residue production has been measured for 4 years (Nov. 1981–Oct. 1985). UnderE. poeppigiana it has reached a value of 8.91 t.ha−1.a−1 and underC. alliodora 7.07 t.ha−1.a−1. The shade trees have contributed 57 and 47% respectively. Transference and decomposition rates are high and important in the nutrient cycles.

The nutrient content of the litter was analysed and corresponding average yearly transfers were (kg.ha−1.a−1):

Key words

Theobroma cacao shade trees Erythrina poeppigiana Cordia alliodora modelling organic matter nitrogen phosphorus potassium calcium magnesium litter production 

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Copyright information

© Martinus Nijhoff Publishers 1988

Authors and Affiliations

  • J. Heuveldop
    • 1
  • H. W. Fassbender
    • 2
  • L. Alpízar
    • 3
  • G. Enríquez
    • 4
  • H. Fölster
    • 5
  1. 1.GTZ-HeadquartersEschbornFederal Republic of Germany
  2. 2.Technical Forest FacultyGöttingenFederal Republic of Germany
  3. 3.Coffee Research Institute of Costa RicaSan JoséCosta Rica
  4. 4.CATIETurrialbaCosta Rica
  5. 5.Faculty of Forest SciencesGöttingenFederal Republic of Germany

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