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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
Authors:J. Heuveldop  H. W. Fassbender  L. Alpízar  G. Enríquez  H. Fölster
Affiliation:1. GTZ-Headquarters, Eschborn, Federal Republic of Germany
2. Technical Forest Faculty, G?ttingen, Federal Republic of Germany
3. Coffee Research Institute of Costa Rica, San José, Costa Rica
4. CATIE, Turrialba, Costa Rica
5. Faculty of Forest Sciences, G?ttingen, Federal Republic of Germany
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): MediaObjects/10457_2005_BF02344744_f1.jpg 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): MediaObjects/10457_2005_BF02344744_f2.jpg For part I see Vol. 4, No. 3, 1986. Agroforestry Project, CATIE/GTZ (Tropical Agricultural Research and Training Center/Gesselschaft für Technische Zusammenarbeit), Turrialba, Costa Rica
Keywords:Theobroma cacao   shade trees   Erythrina poeppigiana    Cordia alliodora   modelling  organic matter  nitrogen  phosphorus  potassium  calcium  magnesium  litter production
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