Fragmentation, fiber separation, decomposition, and nutrient release of secondary-forest biomass, mechanically chopped-and-mulched, and cassava production in the Amazon.

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dc.contributorJosé Miguel Reichert, UFSM; Miriam Fernanda Rodrigues, UFSM; Clóvis Moisés Priebe Bervald, GSI BRAZIL; Gustavo Brunetto, UFSM; OSVALDO RYOHEI KATO, CPATU; Mauro Valdir Schumacher, UFSM.
dc.creatorREICHERT, J. M.
dc.creatorRODRIGUES, M. F.
dc.creatorBERVALD, C. M. P.
dc.creatorBRUNETTO, G.
dc.creatorKATO, O. R.
dc.creatorSCHUMACHER, M. V.
dc.date2015-04-27T11:11:11Z
dc.date2015-04-27T11:11:11Z
dc.date2015-04-27
dc.date2015
dc.date2016-03-10T11:11:11Z
dc.date.accessioned2026-06-30T23:41:38Z
dc.descriptionNo-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.
dc.identifierAgriculture, Ecosystems and Environment, v. 204, p. 8-16, June 2015.
dc.identifierhttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1014295
dc.identifierhttp://dx.doi.org/10.1016/j.agee.2015.02.005
dc.identifier.urihttp://hdl.handle.net/123456789/388093
dc.languageeng
dc.rightsopenAccess
dc.subjectCorte mecanizado
dc.subjectPropriedade química
dc.subjectBiomassa
dc.subjectFloresta
dc.subjectMandioca
dc.subjectSolo
dc.subjectVegetação
dc.subjectAmazonia
dc.titleFragmentation, fiber separation, decomposition, and nutrient release of secondary-forest biomass, mechanically chopped-and-mulched, and cassava production in the Amazon.
dc.typeArtigo de periódico

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Embrapa Amazonía Oriental (CPATU)