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| Registros recuperados: 41 | |
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| Carpanezzi, Fernando Bertol; Gualtieri, Sonia Cristina Juliano. |
| Barnyard grass (Echinochloa crusgalli (L.) P. Beauv.) is a herbicide-resistant weed that brings negative impacts to rice crops and threatens floodplains biodiversity worldwide. This study aimed to investigate allelopathic influences of extracts from Pittosporum undulatum Vent. (cheesewood) leaves on barnyard grass. Leachates in concentrations of 20%, 15%, 10%, 5% and 2.5% (w/v), aqueous extracts from powdered leached and non-leached leaves (10%, 7,5%, 5%, 2.5% and 1.25% for both), coumarin solution at 0.6 mM and original Roundup ® in concentration according to the label information were prepared. Petri-dishes germination bioassays, with counting at each 12 hours, allowed to determinate both germinability and germination rate; polyethylene glycol (PEG 6000)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecology; Plant Ecophysiology Cheesewood tree; Echinochloa crusgalli; Agroecosystems; Floodplains Ecologia; Ecofisiologia Vegetal Pau-incenso; Echinochloa crusgalli; Agroecossistemas; Áreas alagáveis. |
| Ano: 2014 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/599 |
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| Matos,Michela Costa Batista; Silva,Shênia Santos; Teodoro,Adenir Vieira. |
| ABSTRACT Solitary wasps and bees (Hymenoptera) play a key role in ecosystem and agroecosystem functioning. Crops may benefit from biological pest control and pollination carried out by predatory solitary wasps and solitary bees, respectively. Here, we aimed at evaluating the abundance and faunistic compositions of solitary wasps and bees in respect to land-use (pasture, alley cropping, young fallow and old fallow) over an entire year using trap nests in the Brazilian northeastern state of Maranhão. Land-use did not influence the abundance of solitary wasps and bees, however, levels of dominance, abundance and frequency of the species Pachodynerus guadulpensis Saussure, Isodontia sp. 1, Isodontia sp. 2, Trypoxylon nitidum Smith and Megachile cfr. framea... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abiotic factors; Agroecosystems; Faunistic analyses; Trap-nesting. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262016000200171 |
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| Rocha,Rita G.; Ferreira,Eduardo; Leite,Yuri L.R.; Fonseca,Carlos; Costa,Leonora P.. |
| We collected and analyzed 286 Barn owl, Tyto alba (Scopoli, 1769), pellets from two nests in different environments along the mid-Araguaia River in central Brazil. Our analyses revealed that these owls feed mainly on small mammals, especially rodents. Owls from the riverbanks at Fazenda Santa Fé had a more diverse diet, preying mainly on rodents that typically inhabit riparian grasslands - Holochilus sciureus Wagner, 1842 - and forests - Hylaeamys megacephalus (Fischer, 1814) and Oecomys spp., which probably also occur in forest borders or clearings. On the other hand, owls from an agroecosystem at Fazenda Lago Verde preyed mostly on rodent species common in these agrarian fields, Calomys tocantinsi Bonvicino, Lima & Almeida, 2003. Additionally, we... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agroecosystems; Pellets; Riverbanks; Rodentia. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000600003 |
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| Torres-Navarrete,Rumania Alexandra; Vargas-Burgos,Julio Cesar; García-Quintana,Yudel; Torres-Navarrete,Emma Danielly; Arteaga-Crespo,Yasiel. |
| Abstract Naranjilla (Solanum quitoense Lam.), is an economic input of vital importance for the Ecuadorian Amazon due to multiple benefits that offers, although it requires studies that provide a basis for the naranjilla cultivation management. The aim of this research was to determine the influence of socioeconomic variables on the naranjilla production from the rural community of Wamani, Napo province in the Ecuadorian Amazon. For the study, a group-type questionnaire was conducted to 40 rural producers of naranjilla in the region, which was structured based on three levels, which included data on the property, crop management and socio-economic aspects. Additionally, a factor analysis was applied to reduce the variables dimensionality. The results showed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agroecosystems; Crop management; Economic input; Rural economy; Rural producers; Socio-economic indicators; Sustainable rural development. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100065 |
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| Marmolejo-Liloy,Miller; Ponce-Mendoza,Jesús David; Hinestroza-Córdoba,Leidy Indira; Moreno-Holguín,Harold. |
| Abstract A characterization and analysis of the production systems of aromatic, medicinal and spice plants (AMSP) was carried out in La Molana, Atrato-Chocó, Colombia throughout the identification of their biophysical, socioeconomic and financial characteristics, in order to propose agroecological alternatives that solve the problems and identified needs in said systems; applying methodologies and evaluation indicators of agricultural systems addressed to sustainable rural development, design, implementation and evaluation of agroforestiy arrangements, agroforestry systems accompanied by WOST analysis, and agroforestry planning of productive units (APPU), this information was collected through the application of a focal workshop and semi-structured... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agroecological alternatives; Agroecosystems; Agroforestry planning of productive units (APPU); Diagnostics and traditional practices; Sustainable agriculture; Sustainable rural development; Traditional knowledge. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100009 |
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| Sousa, Carla Silva; Universidade Federal de Pernambuco; Menezes, Rômulo Simões Cezar; Universidade Federal de Pernambuco; Sampaio, Everardo Valadares de Sá Barretto; Universidade Federal de Pernambuco; Lima, Francisco Sousa; Universidade Federal do Recôncavo da Bahia; Oehl, Fritz; Agroscope Reckenholz-Tänikon Research Station; Maia, Leonor Costa; Universidade Federal de Pernambuco. |
| The diversity of arbuscular mycorrhizal fungi (AMF) can be a critical factor in enhancing both the productivity and the diversity of plants in ecosystems, and the plants in the ecosystem also strongly influence the occurrence of these fungi. The relationships between different land use systems and AMF communities in the semi-arid region of the State of Paraíba, NE Brazil were evaluated. The experiment followed a split-plot randomized block design, with four replicates. The main plots were defined by the presence or absence of trees (gliricidia and maniçoba), while the split plots were defined by three land use systems: 1) traditional cropping of maize + beans, 2) buffel grass pasture, and 3) prickly pear forage crop. The presence of trees increased... |
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Palavras-chave: Ciencia do solo; Microbiologia agrícola mycorrhizae; Agroecosystems; Glomalin. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/16213 |
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| Lange,Denise; Fernandes,Wedson Desidério; Raizer,Josué; Faccenda,Odival. |
| This study had the objective of assessing the differences in foraging activity of the predacious ants between two areas, one conventional and other with no-till agriculture systems. The research was conducted in two contiguous 1.5 ha plots in Dourados MS, Brazil, from February 2001 to December 2003. Each plot received 750 baits (Nasutitermes termites), 425 at daylight and 325 at night. The termites were placed on the filter paper, on the ground, and ant attack was monitored for 15 min, until removed. Sixteen ant species were found in the no-till system and nine in the conventional system. Baits removed from no-till were significantly higher than the conventional plots and were influenced by the sampling time, at day or night. The seasons of the year did... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agroecosystems; Biological control; Community structure; Soil tillage; Species richness; Predation effects. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000600015 |
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| Reali,Catiusca; Pilz Júnior,Harry Luiz; Meile,Jean Christophe; Galindo,Sabine Shorr; Fiuza,Lidia Mariana. |
| ABSTRACT The microbial composition of different types,in ecosystems (including agro-ecosystems), has been investigated in a rapidly growing number of studies in the past few years. The importance of microorganisms, regarding the maintenance and stability of nutrients in agroecosystems, is a key to maintain the sustainability of a crop. Molecular tools to study microbial communities are possible through many methods such as RISA, DGGE, TGGE, clone libraries, T-RFLP, RAPD, SSCP and more recently NGS (Next-Generation Sequencing). DGGE is widely employed to characterize the diversity and the community dynamics of microorganisms in the environment, making possible to find out specific groups through functional genes, allowing access to data that cannot be... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agroecosystems; Functional genes; Bacteria; DGGE; Metagenomics; Microbial ecology. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100201 |
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| Registros recuperados: 41 | |
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