Data/hora: 09/06/2024 06:49:51

Provedor de dados: | Revista Brasileira de Ciência do Solo
País: | Brazil
Título: | Organic material decomposition and nutrient dynamics in a mulch system enriched with leguminous trees in the Amazon
Autores: | Cattanio,José Henrique; Kuehne,Ronald; Vlek,Paul L.G.
Data: | 2008-06-01
Ano: | 2008
Palavras-chave: | Contrasting chemical compositions; Nutrient mineralization; Nutrient immobilization; Litterbags.
Resumo: | The new techniques proposed for agriculture in the Amazon region include rotational fallow systems enriched with leguminous trees and the replacement of biomass burning by mulching. Decomposition and nutrient release from mulch were studied using fine-mesh litterbags with five different leguminous species and the natural fallow vegetation as control. Samples from each treatment were analyzed for total C, N, P, K, Ca, Mg, lignin, cellulose content and soluble polyphenol at different sampling times over the course of one year. The decomposition rate constant varied with species and time. Weight loss from the decomposed litter bag material after 96 days was 30.1 % for Acacia angustissima, 32.7 % for Sclerolobium paniculatum, 33.9 % for Iinga edulis and the Fallow vegetation, 45.2 % for Acacia mangium and 63.6 % for Clitoria racemosa. Immobilization of N and P was observed in all studied treatments. Nitrogen mineralization was negatively correlated with phenol, C-to-N ratio, lignin + phenol/N ratio, and phenol/phosphorus ratios and with N content in the litterbag material. After 362 days of field incubation, an average (of all treatments), 3.3 % K, 32.2 % Ca and 22.4 % Mg remained in the mulch. Results confirm that low quality and high amount of organic C as mulch application are limiting for the quantity of energy available for microorganisms and increase the nutrient immobilization for biomass decomposition, which results in competition for nutrients with the crop plants.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000300016
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832008000300016
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.32 n.3 2008
Fonte: | info:eu-repo/semantics/openAccess