Please use this identifier to cite or link to this item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1014295
Research center of Embrapa/Collection: Embrapa Amazônia Oriental - Artigo em periódico indexado (ALICE)
Date Issued: 2015
Type of Material: Artigo em periódico indexado (ALICE)
Authors: REICHERT, J. M.
RODRIGUES, M. F.
BERVALD, C. M. P.
BRUNETTO, G.
KATO, O. R.
SCHUMACHER, M. V.
Additional Information: José Miguel Reichert, UFSM; Miriam Fernanda Rodrigues, UFSM; Clóvis Moisés Priebe Bervald, GSI BRAZIL; Gustavo Brunetto, UFSM; OSVALDO RYOHEI KATO, CPATU; Mauro Valdir Schumacher, UFSM.
Title: Fragmentation, fiber separation, decomposition, and nutrient release of secondary-forest biomass, mechanically chopped-and-mulched, and cassava production in the Amazon.
Publisher: Agriculture, Ecosystems and Environment, v. 204, p. 8-16, June 2015.
Language: en
Keywords: Corte mecanizado
Propriedade química.
Description: No-tillage planting in mechanically-chopped secondary-forest seeks to replace slash-and-burning agriculture. We evaluated the effect of horizontal (HC) and vertical (VC) chopping-and-mulching mechanisms on vegetation fragmentation and decomposition rate and nutrient release from chopped residue, and on cassava production in eastern Amazon. Chopped-and-mulched residue was classified into four residue-size (Fs1 = 1?7, Fs2 = 7?25, Fs3 = 25?35, and Fs4 = >35 mm) and six residue-type (with husk/bark ? WB, partially chopped ? PC, compact ? C, partially shredded into fibers ? PS, completely shredded into fibers ? CS, and formless residue ? F) classes. In litter-bags, residual dry matter (DM) was determined at five different days after chopping-and-mulching and residue distribution on soil surface (DAD), whereas release of N, P, K, Ca, and Mg was evaluated at four days. Residues-size and -type classes showed similar decomposition behavior, with a reduction of approximately 60% of initial DM at 90 DAD. Nevertheless, reduction in DM was slow, where 52 days are necessary for half of labile residue to be decomposed, with part of labile and recalcitrant residue remaining on soil surface. DM and nutrients in residue reduced over time. DM was 25% for residues-size classes for HC, 20% for VC, and 26% for residue-type classes, on average, at 300 DAD. Nutrients remaining in residues at 300 DAD were 26% and 27% of N, 26% and 22% of P, 29% and 22% of K, 16% and 15% of Ca, and 17% and 23% of Mg, respectively for HC and VC. Release of nutrients was, generally, greater for smaller residue-size classes, similar between chopping-and-mulching mechanisms, and did not affect cassava yield.
Thesagro: Biomassa
Floresta
Mandioca
Solo
Vegetação.
NAL Thesaurus: Amazonia.
Data Created: 2015-04-27
Appears in Collections:Artigo em periódico indexado (CPATU)

Files in This Item:
File Description SizeFormat 
1s2.0S0167880915000523main.pdf1,75 MBAdobe PDFThumbnail
View/Open

FacebookTwitterDeliciousLinkedInGoogle BookmarksMySpace