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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
10/03/2017 |
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Data da última atualização: |
20/05/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
JOSLIN, A.; MARKEWITZ, D.; MORRIS, L. A.; OLIVEIRA, F. de A.; KATO, O. R. |
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Afiliação: |
Aaron Joslin, The University of Georgia; Daniel Markewitz, The University of Georgia; Lawrence A. Morris, The University of Georgia; Francisco de Assis Oliveira, UFRA; OSVALDO RYOHEI KATO, CPATU. |
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Título: |
Improved fallow: growth and nitrogen accumulation of five native tree species in Brazil. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Nutrient Cycling in Agroecosystems, v. 106, n. 1, p 1-15, Sep. 2016. |
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DOI: |
10.1007/s10705-016-9783-0 |
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Idioma: |
Inglês |
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Conteúdo: |
Small-holding farmers of the Brazilian Amazon often use a rotation of secondary forest, slash-and-burn land-clearing and fallow phase regeneration for agriculture. In recent decades reduction of the fallow phase from ~20 to ~5 years has limited nutrient accumulation by fallow vegetation to sustain future crop growth. Slash-and-mulch and improved fallow schemes, including use of native nitrogen-fixing species, have been investigated to address the issue. In the current study in eastern Amazonia of Brazil, a 7-year old forest site was slash-and-mulched and four treatments applied; no fertilizer and no N-fixer as the control; no fertilizer with N-fixer; P + K fertilizer with no N-fixer; P + K fertilizer with N-fixer. Manioc was planted in all plots at establishment. After manioc harvest and 4 years of fallow, a total of 6 years after planting, use of P + K fertilizer increased tree growth of four of five planted species. In the presence of the N-fixer I. edulis, trends of increased growth and survival among these four tree species were observed. After 6 years, fertilization with P + K significantly increased tree volume and biomass. The N-fixer lowered survival of other species yet increased estimated N uptake of planted trees. Use of P + K fertilizer without N-fixer might allow for commercial harvest of S. amazonicum at the end of one 7-year crop-fallow cycle without jeopardizing agroecosystem N stocks. Use of P + K fertilizer in the presence of I. edulis can increase planted-tree N-content but increases in competition may limit commercial harvest yet may better sustain future food crop growth. MenosSmall-holding farmers of the Brazilian Amazon often use a rotation of secondary forest, slash-and-burn land-clearing and fallow phase regeneration for agriculture. In recent decades reduction of the fallow phase from ~20 to ~5 years has limited nutrient accumulation by fallow vegetation to sustain future crop growth. Slash-and-mulch and improved fallow schemes, including use of native nitrogen-fixing species, have been investigated to address the issue. In the current study in eastern Amazonia of Brazil, a 7-year old forest site was slash-and-mulched and four treatments applied; no fertilizer and no N-fixer as the control; no fertilizer with N-fixer; P + K fertilizer with no N-fixer; P + K fertilizer with N-fixer. Manioc was planted in all plots at establishment. After manioc harvest and 4 years of fallow, a total of 6 years after planting, use of P + K fertilizer increased tree growth of four of five planted species. In the presence of the N-fixer I. edulis, trends of increased growth and survival among these four tree species were observed. After 6 years, fertilization with P + K significantly increased tree volume and biomass. The N-fixer lowered survival of other species yet increased estimated N uptake of planted trees. Use of P + K fertilizer without N-fixer might allow for commercial harvest of S. amazonicum at the end of one 7-year crop-fallow cycle without jeopardizing agroecosystem N stocks. Use of P + K fertilizer in the presence of I. edulis can increase planted-... Mostrar Tudo |
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Palavras-Chave: |
Espécie arbórea. |
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Thesagro: |
Nitrogênio; Pousio. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02274naa a2200217 a 4500
001 2066731
005 2022-05-20
008 2016 bl uuuu u00u1 u #d
024 7 $a10.1007/s10705-016-9783-0$2DOI
100 1 $aJOSLIN, A.
245 $aImproved fallow$bgrowth and nitrogen accumulation of five native tree species in Brazil.$h[electronic resource]
260 $c2016
520 $aSmall-holding farmers of the Brazilian Amazon often use a rotation of secondary forest, slash-and-burn land-clearing and fallow phase regeneration for agriculture. In recent decades reduction of the fallow phase from ~20 to ~5 years has limited nutrient accumulation by fallow vegetation to sustain future crop growth. Slash-and-mulch and improved fallow schemes, including use of native nitrogen-fixing species, have been investigated to address the issue. In the current study in eastern Amazonia of Brazil, a 7-year old forest site was slash-and-mulched and four treatments applied; no fertilizer and no N-fixer as the control; no fertilizer with N-fixer; P + K fertilizer with no N-fixer; P + K fertilizer with N-fixer. Manioc was planted in all plots at establishment. After manioc harvest and 4 years of fallow, a total of 6 years after planting, use of P + K fertilizer increased tree growth of four of five planted species. In the presence of the N-fixer I. edulis, trends of increased growth and survival among these four tree species were observed. After 6 years, fertilization with P + K significantly increased tree volume and biomass. The N-fixer lowered survival of other species yet increased estimated N uptake of planted trees. Use of P + K fertilizer without N-fixer might allow for commercial harvest of S. amazonicum at the end of one 7-year crop-fallow cycle without jeopardizing agroecosystem N stocks. Use of P + K fertilizer in the presence of I. edulis can increase planted-tree N-content but increases in competition may limit commercial harvest yet may better sustain future food crop growth.
650 $aNitrogênio
650 $aPousio
653 $aEspécie arbórea
700 1 $aMARKEWITZ, D.
700 1 $aMORRIS, L. A.
700 1 $aOLIVEIRA, F. de A.
700 1 $aKATO, O. R.
773 $tNutrient Cycling in Agroecosystems$gv. 106, n. 1, p 1-15, Sep. 2016.
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Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
15/05/2002 |
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Data da última atualização: |
15/05/2002 |
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Autoria: |
SCHACHT, W. H.; MESQUITA, R. C. M.; MALECHEK, J. C.; KIRMSE, R. D. |
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Título: |
Response of Caatinga Vegetation to Decreasing Levels of Canopy Cover. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, v. 24, n.11, p.14121-1426, nov. 1989 |
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Idioma: |
Português |
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Conteúdo: |
Although clearing of the caatinga forest is conducted primarily to open arcas for crop production and to harvest wood, vegetation manipulation is being promoted as a means of increasing forage availability to livestock. Response of caatinga vegetation to various; levels of canopy cover removal is being studied in two experimerits at the CNPC, Sobral, CE, Brazil. Complete removal of the tree canopy resulted in a six to eightfo"d increase in first year production of herbaceous vegetation. This magnitude of increase was also true for ranopy covers of 20% - 30% and 50% - 60%. Caatinga species coppice readily following cutting and, therefore, canopy cover for the cleared treatment (complete removal) was equal to that of the control (approximately 95 %) by the end of die fourth ycar posttreatment. As a result, herbaceous vegetation and leaf litter yiclds for the two treatments were similar, too. Sabiá (Mimosa caesalpiniaefolia), a tree species which produces palatable browse and valuable wood, responded very favorably to clearing. Not only did many new plants establish, but by the fourth year posttreatment sabiá coppice on the cleared areas produced as much as ten times more foliar biomass than did the intact trees on the control area. The high herbaceous vegetation yields under a thinned canopy and the favorable responses; to cutting of tree species; such as sabiá indicate diat a multiple use approach involving selectively thinned caatinga could be developed whereby production of the naturally renewable wood and forage resources would be optimized. MenosAlthough clearing of the caatinga forest is conducted primarily to open arcas for crop production and to harvest wood, vegetation manipulation is being promoted as a means of increasing forage availability to livestock. Response of caatinga vegetation to various; levels of canopy cover removal is being studied in two experimerits at the CNPC, Sobral, CE, Brazil. Complete removal of the tree canopy resulted in a six to eightfo"d increase in first year production of herbaceous vegetation. This magnitude of increase was also true for ranopy covers of 20% - 30% and 50% - 60%. Caatinga species coppice readily following cutting and, therefore, canopy cover for the cleared treatment (complete removal) was equal to that of the control (approximately 95 %) by the end of die fourth ycar posttreatment. As a result, herbaceous vegetation and leaf litter yiclds for the two treatments were similar, too. Sabiá (Mimosa caesalpiniaefolia), a tree species which produces palatable browse and valuable wood, responded very favorably to clearing. Not only did many new plants establish, but by the fourth year posttreatment sabiá coppice on the cleared areas produced as much as ten times more foliar biomass than did the intact trees on the control area. The high herbaceous vegetation yields under a thinned canopy and the favorable responses; to cutting of tree species; such as sabiá indicate diat a multiple use approach involving selectively thinned caatinga could be developed whereby production of... Mostrar Tudo |
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Palavras-Chave: |
coppice; vegetation manipulation. |
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Thesagro: |
Mimosa Caesalpiniaefolia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02150naa a2200193 a 4500
001 1107226
005 2002-05-15
008 1989 bl uuuu u00u1 u #d
100 1 $aSCHACHT, W. H.
245 $aResponse of Caatinga Vegetation to Decreasing Levels of Canopy Cover.
260 $c1989
520 $aAlthough clearing of the caatinga forest is conducted primarily to open arcas for crop production and to harvest wood, vegetation manipulation is being promoted as a means of increasing forage availability to livestock. Response of caatinga vegetation to various; levels of canopy cover removal is being studied in two experimerits at the CNPC, Sobral, CE, Brazil. Complete removal of the tree canopy resulted in a six to eightfo"d increase in first year production of herbaceous vegetation. This magnitude of increase was also true for ranopy covers of 20% - 30% and 50% - 60%. Caatinga species coppice readily following cutting and, therefore, canopy cover for the cleared treatment (complete removal) was equal to that of the control (approximately 95 %) by the end of die fourth ycar posttreatment. As a result, herbaceous vegetation and leaf litter yiclds for the two treatments were similar, too. Sabiá (Mimosa caesalpiniaefolia), a tree species which produces palatable browse and valuable wood, responded very favorably to clearing. Not only did many new plants establish, but by the fourth year posttreatment sabiá coppice on the cleared areas produced as much as ten times more foliar biomass than did the intact trees on the control area. The high herbaceous vegetation yields under a thinned canopy and the favorable responses; to cutting of tree species; such as sabiá indicate diat a multiple use approach involving selectively thinned caatinga could be developed whereby production of the naturally renewable wood and forage resources would be optimized.
650 $aMimosa Caesalpiniaefolia
653 $acoppice
653 $avegetation manipulation
700 1 $aMESQUITA, R. C. M.
700 1 $aMALECHEK, J. C.
700 1 $aKIRMSE, R. D.
773 $tPesquisa Agropecuária Brasileira, Brasília$gv. 24, n.11, p.14121-1426, nov. 1989
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