Modelling agroforestry systems of cacao (Theobroma cacao) with laurel (Cordia alliodora) and poro (Erythrina poeppigiana) in Costa Rica III. Cycles of organic matter and nutrients |
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| Authors: | H W Fassbender L Alpízar J Heuveldop H Fölster G Enríquez |
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| Institution: | (1) Technical Forestry Faculty, Göttingen, Federal Republic of Germany;(2) Coffee Research Institute of Costa Rica, San José, Costa Rica;(3) GTZ-Headquarters, Eschborn, Federal Republic of Germany;(4) Faculty of Forest Sciences, Göttingen, Federal Republic of Germany;(5) CATIE, Turrialba, Costa Rica |
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| Abstract: | Models for cycles for organic matter and nutrients element (N, P, K, Ca and Mg) are presented for the agroforestry systems of cacao (Theobroma cacao) withCordia alliodora orErythrina poeppigiana in Turrialba, Costa Rica.For the models, system reserves (soil, humus, vegetation divided into leaves, branches, stems, fine roots, fruits) and transference between compartments (production and decomposition of litter residues) inputs (fertilizer, rainfall) and outputs (harvests) of the system are considered.The implications of the models are discussed in detail.Aspects of net primary production in the systems studied are considered.N fixation is calculated on the basis of balances. Analysis of soil water showed high variations that coincided with rainfall patterns and pruning of theE. poeppigiana.For part I see Vol. 4, No. 3, 1986 For part II see this issueAgroforestry Project, CATIE/GTZ (Tropical Agricultural Research and Training Center/Gesellschaft für Technische Zusammenarbeit), Turrialba, Costa Rica |
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| Keywords: | Theobroma cacao shade trees Erythrina poeppigiana Cordia alliodora modelling organic matter nitrogen phosphorus potassium calcium magnesium |
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