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Soil nutrient availability and CO2 production in agroforestry systems after the addition of Erythrina poeppigiana pruning residues and native microbial inocula

Payan-Zelaya F., Harmand J.M., Flores-Macías A., Beer J., Ramos-Espinoza G., De Léon González F.. 2013. AgroForestry Systems, 87 (2) : p. 439-450.

To investigate the effects of microbial inocula and Erythrina poeppigiana pruning residues on soil K, NO3-, and NH4? concentrations, a greenhouse trial, a field experiment in an organic farm, and three in vitro tests were conducted. Under controlled conditions, weak, temporary effects (10 %) on maize seedling growth were observed on poor soils (taken from the 10-20 cm layer) in the first 2 weeks after application. Positive effects of pruning residue applications on soil K levels (0.09 cmol kg-1, on average) were detected in both the field and greenhouse study. However, significant effects due to the addition of microbial inocula on soil K concentrations were not detected in the field; thus, microbial applications were ineffective at enhancing nutrient availability under field conditions. In contrast, in the in vitro experiments, CO2 production was 31 % greater than that of untreated soil on the 8th and 15th days of incubation. These results highlight the importance of adding tree pruning residues to support coffee-plant nutrition. Experimental outcome data could be valuable for further studies focused on microbial application dosage and timing. (Résumé d'auteur)

Mots-clés : émission atmosphérique; flore microbienne; flore du sol; fertilité du sol; dioxyde de carbone; disponibilité d'élément nutritif; agriculture biologique; taille; déchet agricole; erythrina poeppigiana; agroforesterie; coffea; costa rica

Thématique : Systèmes et modes de culture; Production forestière; Chimie et physique du sol; Fertilité du sol; Traitement des déchets agricoles; Biologie du sol

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