Fallow
Mostrando 25-36 de 77 artigos, teses e dissertações.
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25. Structure and composition of bacterial and fungal community in soil under soybean monoculture in the Brazilian Cerrado
Soybean is the most important oilseed cultivated in the world and Brazil is the second major producer. Expansion of soybean cultivation has direct and indirect impacts on natural habitats of high conservation value, such as the Brazilian savannas (Cerrado). In addition to deforestation, land conversion includes the use of fertilizers and pesticides and can l
Brazilian Journal of Microbiology. Publicado em: 2010-06
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26. Alternative food sources and overwintering feeding behavior of the boll weevil, Anthonomus grandis boheman (coleoptera: curculionidae) underthe tropical conditions of central Brazil
The boll weevil causes serious damage to the cotton crop in South America. Several studies have been published on this pest, but its phenology and behavior under the tropical conditions prevailing in Brazil are not well-known. In this study the feeding behavior and main food sources of adult boll weevils throughout the year in Central Brazil was investigated
Neotropical Entomology. Publicado em: 2010-02
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27. Organic matter in Albaqualf as affected by managements irrigated rice cropping systems the South from Brazil / Matéria orgânica em Planossolo Háplico sob sistemas de manejo no cultivo do arroz irrigado no Sul do Brasil
In the south region from Rio Grande do Sul State, in,Brazil, 950 thousand hectares of soils are cultivated with rice, an important agricultural activity in that region, under an irrigation (flooded) system, using different soil management techniques. Studies regarding the organic matter (OM) dynamic in these soils are incipient, so this work aimed to evaluat
Publicado em: 2010
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28. Memória social e ecologia histórica: a agricultura de coivara das populações quilombolas do vale do Ribeira e sua relação com a formação da mata atlântica local / Social memory and historical ecology:slash and burn agriculture in the formation of an Atlantic rainforest area inhabited by quilombola communities, Ribeira Valley, Brazil
The Atlantic Rainforest is one of the worlds most diverse and threatened biomes. The majority of its remnants are located at the Ribeira Valley (SP) where several of the States quilombola populations remain. The Valleys quilombos originated from a population of freed, abandoned or refugee slaves brought to the region in the beginning of the European coloniza
Publicado em: 2010
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29. Estoques de biomassa e de nutrientes de pousios enriquecidos com Inga edulis Martius em áreas com histórico de agricultura e de pecuária no Assentamento Tarumã-Mirím, Manaus- AM / Stocks of biomass and nutrients in forest fallow enriched with Inga edulis Martius in sites with a history of agriculture and pasture in the rural settlement Tarumã-Mirím, Manaus - AM
Deforestation rates of primary forests in the humid tropics have been growing intensively in recent years, due mainly to the development of shifting cultivation and extensive pasture. After forest fragmentation and conversion to agricultural use, the cleared areas of rainforest are usually abandoned so there is natural regeneration of vegetation and slow res
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/12/2009
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30. Fluxos de emergência, épocas de aplicação de herbicidas e sistemas de manejo de plantas daninhas em cana-de-açúcar / Emergence fluxes, herbicide application timings and weed management systems in sugarcane
The knowledge of the effects of the population dynamics and establishment velocity of weeds on the efficacy of weed management in the sugarcane crop is fundamental for the development of a rational plan of integrated weed management in the crop. Therefore, the objectives of the present research were: (i) to quantify the monthly fluxes of weed emergence year
Publicado em: 2009
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31. NITROUS OXIDE EMISSION AND CARBON MINERALIZATION OF COVER CROPS AND PIG AND DAIRY CATTLE SLURRIES IN NOTILLAGE OF CASTOR BEAN / EMISSÃO DE ÓXIDO NITROSO E MINERALIZAÇÃO DO CARBONO DE PLANTAS DE COBERTURA E DE DEJETOS DE SUÍNOS E BOVINOS EM PLANTIO DIRETO DE MAMONA
The increase in the availability of nutrients to soil microorganisms, especially carbon (C) and nitrogen (N), through crop residues and animal slurries can increase dioxide carbon (CO2) and nitrous oxide (N2O) emissions to the atmosphere. In order, to evaluate this hypothesis, two studies in field conditions were conducted in a typic Hapludalf at experimenta
Publicado em: 2009
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32. Weeds supression and agronomic characteristics of corn crop under leguminous residues in no-tillage system / SupressÃo de plantas invasoras e caracterÃsticas agronÃmicas da cultura do milho sob resÃduos culturais e leguminosas em sistema plantio direto
The use of cover crops on no-tillage system can add several advantages, such as controlling the weeds population. The leguminous species also carry out biological nitrogen fixation, increase nutrients to the soil and bring other benefits. Therefore, this research aimed at testing the leguminous, dwarf mucuna beans, dwarf pigeon pea and stylosanthes on seedli
Publicado em: 2009
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33. Crop rotation Scheduling - modeling and solution methodolies / Programação de rotação de culturas - modelos e métodos de solução
Over the last decades, various proposals for techniques and processes to increase agricultural sustainability have been put forward. These proposals bring new planning models in which technical and ecological production aspects must be considered, as well as the access of small farmers to the consumer market. In this type of agricultural production planning,
Publicado em: 2009
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34. Interference of sorghum, braquiaria and pearl millet cover crops on maize and weeds / INTERFERÃNCIA DE PALHADAS DE SORGO, CAPIM BRAQUIÃRIA E MILHETO SOBRE CULTURA DO MILHO E PLANTAS DANINHAS
This work aimed to evaluate the effect of forage grass cover crops on corn (Zea mays), weed infestation and floristic weed composition. The treatments were three cover crops: Braquiaria (Brachiaria brizantha); pearl millet (Pennisetum glaucum) and inter specific sorghum hybrid BRS 800 (Sorghum bicolor x Sorghum sudanens) submitted to one cut 60 days after pl
Publicado em: 2008
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35. Pagamento por serviços ambientais: limites e oportunidades para o desenvolvimento sustentável da agricultura familiar na Amazônia Brasileira / Payments for environmental services: limits and opportunities for sustainable development of family farming in the Brazilian Amazon.
Payment for environmental services is an economic instrument that has been used to encourage the adoption of land and/or natural resource uses that improve or enhance the provision of environmental services, such as biodiversity conservation and carbon sequestration. Its use is recent and the effects that changes in land use can bring to income and developme
Publicado em: 2008
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36. Validation of the NUTMON model for the diagnosis of agricultural management: study on two family farms in Rio de Janeiro State. / Validação do modelo NUTMON para o diagnóstico do manejo agrícola: Estudo em duas propriedades familiares do Rio de Janeiro.
This study had the following hypothesis: the agricultural production systems adopted by small farmers brings about nutrient negative balances to soil, which causes the loss of soil fertility and crop yield decline in the time span. The general objective of this study was to validate the NUTMON model of the Food and Agriculture Organization of the United Nati
Publicado em: 2008