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| Registros recuperados: 18 | |
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| BORGES, A. L.; NASCIMENTO FILHO, E. C.; ARAÚJO, J. V. C.. |
| Resumo ? As bananeiras demandam grandes quantidades de nutrientes para o seu desenvolvimento vegetativo e produção. Além disso, há diferenças de exigências nutricionais entre as variedades e sistemas de cultivo. No sistema orgânico deve-se priorizar a utilização de espécies vegetais adaptadas às condições edafoclimáticas locais e tolerantes a pragas e doenças. Assim, a avaliação dos nutrientes em variedades de bananeiras cultivadas nesse sistema é necessária para definir o melhor manejo a ser adotado. O trabalho objetivou determinar a quantidade de fitomassa e de nutrientes acumuladas nos diversos órgãos em variedades de bananeira cultivadas em sistema orgânico. Na colheita do segundo ciclo, três plantas de cada variedade de bananeira foram selecionadas e... |
| Tipo: Folhetos |
Palavras-chave: Banana; Musa sp; Nutriente Orgânico; Solo; Soil nutrients. |
| Ano: 2023 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1151602 |
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| Odendo, Martins; Obare, Gideon A.; Salasya, Beatrice. |
| Most adoption studies have employed cross-sectional data in a static discrete choice modelling framework to analyze why some farmers adopt at a certain point in time. The static approach does not consider the dynamic environment in which the adoption decision is made and thus does not incorporate the speed of adoption and the effect of time-dependent elements in explaining adoption. The adoption speed of an innovation is important in various aspects. Based on data from a survey of a random sample of 331 smallholder households in western Kenya, this study investigated determinants of time to adoption of mineral fertilizer, animal manure and compost using Duration analysis. Results revealed that factors that influenced timing of the adoption varied by the... |
| Tipo: Journal Article |
Palavras-chave: Adoption; Duration analysis; Soil nutrients; Crop Production/Industries; Land Economics/Use. |
| Ano: 2010 |
URL: http://purl.umn.edu/96192 |
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| Grogan,James; Galvão,Jurandir. |
| Seasonally dry evergreen forests in southeast Pará, Brazil are transitional between taller closed forests of the interior Amazon Basin and woodland savannas (cerrados) of Brazil's south-central plains. We describe abiotic and biotic gradients in this region near the frontier town of Redenção where forest structure and composition grade subtly across barely undulating topography. Annual precipitation averaged 1859 mm between 1995-2001, with nearly zero rainfall during the dry season months of June August. Annual vertical migrations of deep-soil water caused by seasonal rainfall underlie edaphic and floristic differences between high- and low-ground terrain. Low-ground soils are hydromorphic, shaped by perching water tables during the wet season, pale gray,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Babaçu; Big-leaf mahogany; Disturbance; Soil nutrients; Water table. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672006000400009 |
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| Stamford,Newton Pereira; Simões Neto,Djalma Eusébio; Freitas,Ana Dolores Santiago de; Oliveira,Emídio Cantídio Almeida; Oliveira,Wagner Silva; Cruz,Leila. |
| ABSTRACT The deployment of soluble fertilizers has been one of the most commonly applied agricultural practices in the bid to increase crop yield. However, the production of soluble fertilizers has a considerable economic cost and consumes a substantial amount of energy. In general, soil organic matter provides the nutrients needed for plant growth in organic agriculture. However, these nutrients are not sufficient if the best yield is to be obtained. The aim of our field experiment was to evaluate the effectiveness of phosphate and potassic sources (rocks, bio-fertilizers and soluble fertilizers) based on several sugarcane characteristics and soil attributes. Our experiment was conducted over two consecutive years, and we assessed the effect of using... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acidithiobacillus; Organic fertilization; Organic matter; Soil nutrients; Sulfur oxidation. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100029 |
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| Sparovek,G.; Camargo,O. A.. |
| The precise sampling of soil, biological or micro climatic attributes in tropical forests, which are characterized by a high diversity of species and complex spatial variability, is a difficult task. We found few basic studies to guide sampling procedures. The objective of this study was to define a sampling strategy and data analysis for some parameters frequently used in nutrient cycling studies, i. e., litter amount, total nutrient amounts in litter and its composition (Ca, Mg, Κ, Ν and P), and soil attributes at three depths (organic matter, Ρ content, cation exchange capacity and base saturation). A natural remnant forest in the West of São Paulo State (Brazil) was selected as study area and samples were collected in July, 1989. The total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tropical forest; Utter; Soil nutrients; Variability. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06831997000400014 |
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| JULIÃO,Genimar Rebouças; ALMADA,Emmanuel Duarte; COSTA,Flávia Regina Capellotto; CARNEIRO,Marco Antônio Alves; FERNANDES,G. Wilson. |
| ABSTRACT Topographic gradients in terra firme forests are associated with pronounced changes in soil texture, soil nutrients and distance to the water-table, thereby creating different hydric and nutritional conditions for plants and their associated herbivore community. The aim of this study was to investigate galling species and host plant richness and gall species composition across topographic habitats differing in nutrient and water stress in the Brazilian Amazon rainforest. Nineteen 250 x 3 m plots were randomly sampled in the valley, slope, plateau-slope transition, and plateau habitats in terra firme forests. All individual dicotyledonous plants 1 to 3 meters high were examined for the presence of insect galls. Galling species and host plant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Habitat stress; Soil nutrients; Species diversity; Terra firme forest; Topographic gradient. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000300237 |
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| Registros recuperados: 18 | |
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