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| Almekinders, Conny J. M.; Knowledge, Technology and Innovation Group, Wageningen University; conny.almekinders@wur.nl; Stomph, Tjeerd-Jan; Centre for Crop Systems Analysis, Wageningen University; tjeerdjan.stomph@wur.nl; Struik, Paul C.; Centre for Crop Systems Analysis, Wageningen University; paul.struik@wur.nl. |
| We evaluated farmers’ rationales to understand their decision making in relation to the use of fertile anthropogenic soils, i.e., Amazonian dark earths (ADE), and for dealing with changes in shifting cultivation in Central Amazonia. We analyzed qualitative information from 196 interviews with farmers in 21 riverine villages along the Madeira River. In order to decide about crop management options to attain their livelihood objectives, farmers rely on an integrated and dynamic understanding of their biophysical and social environment. Farmers associate fallow development with higher crop yields and lower weed pressure, but ADE is always associated with high yields and high weeding requirements. Amazonian dark earths are also seen as an opportunity... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Amazonia; Amazonian dark earths; Decision making; Intensification; Slash and burn; Swidden cultivation; Terra preta. |
| Ano: 2016 |
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| SOMBROEK, W.; KERN, D. C.; RODRIGUES, T. E.; CRAVO, M. da S.; CUNHA, T. J. F.; WOODS, W.; GLASER, B.. |
| Os solos Terra Preta apresentam muito material arqueológico (fragmentos cerâmicos, lítico, além do carvão vegetal). Esses solos são pretos ou bruno muito escuro até uma profundidade de pelo menos 50 cm, em média; apresentam teores elevados de P disponível (acima de 100 mg.dm-3) e são menos ácidos que os solos circunvizinhos. |
| Tipo: Capítulo em livro técnico (INFOTECA-E) |
Palavras-chave: Terra Mulata; Potencialidade agrícola; Sustentabilidade; Solo; Reprodução; Terra preta. |
| Ano: 2010 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/888998 |
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| BIRK, J.; TEIXEIRA, W.; NEVES, E. G.; GLASER, B.. |
| Geochemically, Amazonian Dark Earths are characterised by a high fertility caused by stable soil organic matter and high nutrient levels. The nutrient stocks and nutrient forms have been intensively investigated in the last decades. Only a few studies about the origin of nutrients have been carried out. Up to now, bones have been identified as one source of nutrients in Amazonian Dark Earths but other sources, e.g. plant biomass and faecal material, are still a matter of speculation. We will discuss possible nutrient sources and associated land-use practices, and will present the first data from analyses of stanols and bile acids. These biomarkers are used to investigate the input of faecal material to soils. Our data show that excrements contribute to the... |
| Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) |
Palavras-chave: Origem; Marcador Molecular; Amazonia; Terra preta. |
| Ano: 2008 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/683916 |
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| KAMPF, N.; WOODS, W. I.; KERN, D. C.; CUNHA, T. J. F.. |
| Na Região Amazônica ocorrem áreas onde as características originais do solo foram modificadas pela atividade humana pré-histórica. Esses solos apresentam cor escura, restos de material arqueológico (fragmentos cerâmicos e de artefatos líticos) e altos teores de carbono orgânico, fósforo, cálcio, magnésio, zinco e manganês contrastando com os solos naturais. Em função da coloração escura da camada superficial, tais solos são conhecidos por designações como Terra Preta, Terra Preta de Índio, Terra Preta Antropogênica e Terra Preta Arqueológica. As características das Terras Pretas TPs (e de outros solos antrópicos) podem ser altamente variáveis entre sítios (Smith, 1980) e dentro de sítios (Kern, 1988, 1996), dando origem a diferentes tipos de indivíduos TP.... |
| Tipo: Capítulo em livro técnico (INFOTECA-E) |
Palavras-chave: Classificação; Propriedades morfológicas; Solos; Terra preta. |
| Ano: 2010 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/888990 |
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| Costa,Marcondes Lima da; Kern,Dirse Clara; Pinto,Alice Helena Eleotério; Souza,Jorge Raimundo da Trindade. |
| This paper carried out a chemical investigation of archaeological ceramic artifacts found in archaeological sites with Black Earth (ABE) in the Lower Amazon Region at Cachoeira-Porteira, State of Pará, Brazil. The ceramic artifacts, mostly of daily use, belong to Konduri culture (from 900 to 400 years BP). They are constituted of SiO2, Al2O3, Fe2O3, Na2O and P2O5; SiO2 and Al2O3 together add up to 80 % and indicate influence of acid rocks, transformed into clay minerals basically kaolinite. The relative high contents of P2O5 (2.37 % in average) come out as (Al,Fe)-phosphate, an uncommon fact in primitive red ceramics, but found in some roman and egyptian archaeological sites. The contents of the trace elements are similar or below the Earth's crust... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Terra preta; Black earth; Lower Amazon; Soil; Chemistry; Phosphorus; Geochemical Evolution. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672004000300004 |
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