Disponibilidad de nitrogeno en el suelo bajo especies maderables y leguminosas usadas como sombra en sistemas de Coffea arabica
The contribution of five shade tree species (leguminous: Inga spp. or Erythrina poeppigiana, and timber: Eucalyptus deglupta, Terminalia ivorensis or Terminalia amazonia) to N availability in the 0-10 cm soil layer was studied in coffee (Coffea arabica) agroforestry systems in the southern Pacific zone of Perez Zeledon, Costa Rica. The soils studied were collected from three sites: Verde Vigor (Ultisol), Santa Fe (Ultisol) and San Pedro (alluvial soil). Maize (Zea mays), cultivated in a greenhouse, was used as an indicator species of N contribution to the soil from each shade species. At the end of the dry season (March 2002), soils under the timber species had lower N03- contents compared to coffee in full sun or associated with leguminous trees. Mineralisation rates of soil N in anaerobic conditions (Npm) were higher under leguminous trees than under timber trees or in full sun. For the alluvial sandy site, biomass production and N extraction by maize was greater with the soils from the plots with leguminous species. For this site, the parameters influenced by the shade species (soil N03- and Npm; N content and N release from the tree roots) were positively related with biomass production and N extraction by the maize.
| Main Authors: | , , |
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| Format: | article biblioteca |
| Language: | spa |
| Subjects: | F61 - Physiologie végétale - Nutrition, Erythrina poeppigiana, Eucalyptus deglupta, Terminalia, plante d'ombrage, Fixation de l'azote, transport des substances nutritives, http://aims.fao.org/aos/agrovoc/c_27199, http://aims.fao.org/aos/agrovoc/c_2687, http://aims.fao.org/aos/agrovoc/c_7672, http://aims.fao.org/aos/agrovoc/c_7019, http://aims.fao.org/aos/agrovoc/c_5196, http://aims.fao.org/aos/agrovoc/c_5272, http://aims.fao.org/aos/agrovoc/c_1920, |
| Online Access: | http://agritrop.cirad.fr/531033/ http://agritrop.cirad.fr/531033/1/531033.pdf |
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