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| Registros recuperados: 10 | |
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| Machado,Walquíria; Telles,Tiago Santos; Tavares Filho,João; Guimarães,Maria de Fátima; Alves,Grace Bungenstab; Borges,José Luiz Bernardo. |
| This study had the purpose of evaluating the effects of two management types of sugarcane: harvesting of burnt cane (BCH) and mechanized harvesting of unburnt green cane (MCH), on some soil physical properties of a dystrophic Rhodic Haplustox. The data were then compared with results for the same soil type under native forest. A completely randomized design was used, with three treatments and 20 replications. The following characteristics were determined: organic matter, aggregate stability, soil bulk density, and porosity at depths of 0-0.20 m and soil penetration resistance. After 15 years of cultivation, there were some alterations in the soil under cane burnt before harvesting, evidenced by a drop in the weighted average diameter of stable aggregates... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum officinarum; Soil bulk density; Porosity; Soil penetration resistance; Soil aggregate stability. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600004 |
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| Telles,Tiago Santos; Dechen,Sonia Carmela Falci; Guimarães,Maria de Fátima. |
| The problem of soil erosion in Brazil has been a focus of agricultural scientific research since the 19th century. The aim of this study was to provide a historical overview of the institutional landmarks which gave rise to the first studies in soil erosion and established the foundations of agricultural research in Brazil. The 19th century and beginning of the 20th century saw the founding of a series of institutions in Brazil, such as Botanical Gardens, executive institutions, research institutes, experimental stations, educational institutions of agricultural sciences, as well as the creation and diversification of scientific journals. These entities, each in its own way, served to foster soil erosion research in Brazil. During the Imperial period... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Historiography; Soil conservation; Land degradation; Soil science. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000600001 |
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| Costa,Gustavo Vaz da; Neves,Carmen Silvia Vieira Janeiro; Telles,Tiago Santos. |
| Abstract The aim of this study was to identify and qualify the microregions specialized in orange production and the spatial dynamics of citrus production in the state of Paraná, Brazil. For this purpose, data from the Brazilian Institute of Geography and Statistics and the Brazilian Central Bank were used. The location quotient (LQ) methodology was applied, the principal component analysis (PCA) and the cluster analysis were carried out, and information regarding the location of industries and agribusiness cooperatives that process orange juice in the state of Paraná was collected. The LQ results, subdivided into 5-year periods, denote changes in the spatial dynamics of orange production. Between 1998-2002 and 2013-2017, the specialized microregions... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fruit; Citrus; Regional specialization; Production chain. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452020000200501 |
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| Nogueira,Marco Antonio; Telles,Tiago Santos; Fagotti,Dáfila dos Santos Lima; Brito,Osmar Rodrigues; Prete,Cássio Egídio Cavenaghi; Guimarães,Maria de Fátima. |
| We assessed the effect of different winter crops on indicators of soil quality related to C and N cycling and C fractions in a Rhodic Kandiudult under no-till system at implantation, during two growing seasons, in Londrina PR Brazil. The experimental design was randomized blocks with split-plot in time arrangement, with four replications. The parcels were the winter crops: multicropping of cover crops with black oat (Avena strigosa), hairy vetch (Vicia villosa) and fodder radish (Raphanus sativus); sunflower (Heliantus annuus) intercropped with Urochloa ruziziensis; corn (Zea mays) intercropped with Urochloa; and corn; fodder radish; or wheat (Triticum aestivum) as sole crops. The subplots were the years: 2008 and 2009. Determinations consisted of total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioindicators; Organic Mater; Carbon; Microbial biomass. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000500014 |
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| Laurenti,Antonio Carlos; Pellini,Tiago; Telles,Tiago Santos. |
| Resumo:Na última década do século XX constatou-se uma crescente diversificação na composição ocupacional e um lento crescimento da população rural brasileira em idade ativa. O objetivo deste estudo é apresentar, para o período de 2001 a 2009, as principais tendências de ocupação e rendimento das pessoas residentes no meio rural brasileiro. A partir dos microdados da Pesquisa Nacional por Amostra de Domicílios (PNAD) e com base em um modelo de regressãolog-linear, foram analisadas as variações na população, no rendimento, no rendimento médio e no índice de Gini. Constatou-se que, não obstante o declínio na PEA rural ocupada na agricultura mercantil, a população rural brasileira se manteve estável devido, principalmente, à expansão da PEA com ocupação não... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PEA rural; Ocupação agrícola; Ocupação não agrícola; PNAD; Índice de Gini.. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-20032015000200321 |
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| Telles,Tiago Santos; Dechen,Sonia Carmela Falci; Souza,Luiz Gustavo Antonio de; Guimarães,Maria de Fátima. |
| Soil is an essential natural resource for humans and an important part of the environment. However, soil is often used and managed inappropriately, causing its erosion and degradation, with concomitantly negative social, political and economic impacts. This study aimed to discuss sustainable development; and losses and problems caused by soil erosion, and to suggest a model for assessing erosion costs. The relevance of economic models for costing soil erosion is stressed. Based on an economic theory, it presents a procedure for assessing economic costs of soil erosion, centered on the on-site and off-site costs that are generated. The physical processes of soil erosion are described and their economic effects reviewed, drawing on theoretical and empirical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil degradation; Soil loss; Soil conservation; Sustainable development. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300010 |
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| Dechen,Sonia Carmela Falci; Telles,Tiago Santos; Guimarães,Maria de Fátima; Maria,Isabella Clerice De. |
| O objetivo deste estudo é estimar custos da erosão hídrica associados às perdas de nutrientes em quatro taxas de cobertura artificial do solo. O experimento foi conduzido de 1987 a 1996, em talhões coletores de perdas por erosão, em Campinas (SP), em Latossolo Vermelho distroférrico, sob chuva natural. O delineamento experimental foi inteiramente ao acaso, com quatro tratamentos (taxas de cobertura do solo: 0%, 24%, 40% e 90%) e três repetições. Para estimar os custos, os teores de P, K+, Ca2+ e Mg2+ na água da enxurrada e na terra carreada pela erosão foram somados, convertidos em superfosfato triplo, cloreto de potássio e calcário dolomítico, e multiplicados pelos seus preços de mercado. Os resultados indicam, para as condições experimentais, que quanto... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Perdas de terra; Perdas de água; Perdas de nutrientes; Valoração econômica; Valoração ambiental. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000200224 |
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| Santos Neto,José dos; Schwan-Estrada,Kátia Regina Freitas; Sena,José Ozinaldo Alves de; Telles,Tiago Santos. |
| ABSTRACT The aim of the present study is to evaluate the economic viability of tomato cultivation in a system of organic farming, and to compare it with the conventional farming system. The fixed and variable costs of both cultivation systems were calculated, as well as the costs of disease control with the application of alternative products and pesticides. The revenues were computed using commercial production and the direct sales price. The total cost per area was higher in the conventional system, while the cost per plant was greater in the organic system, since it used a lower plant population density. In the conventional system, 2.33 times more was spent on plant management, due to the fact that the number of sprayings was greater than that carried... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sustainability; Solanum lycopersicum; Cymbopogon citratus; Costs of production; Production systems. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100205 |
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| Volsi,Bruno; Bordin,Ivan; Higashi,Gabriel Eiji; Telles,Tiago Santos. |
| ABSTRACT: Even in areas of predominance of Caiuá sandstone, with soils of low natural fertility that are highly susceptible to erosion and degradation processes, farmers have adopted systems with little diversification, because they believe that they provide a greater economic return. However, agricultural practices such as crop rotation can bring agronomic benefits in terms of conservation agriculture, in addition to economic gains, circumventing edaphoclimatic difficulties in the region. In this context, the objective of this study is to verify whether no-till crop rotation systems are economically profitable, in a Caiuá sandstone area in the northwest region of the Brazilian state of Paraná. To this end, an experiment was conducted in the municipality... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cost analysis; Agricultural production; Agricultural economy; Rural administration; Conservation agriculture. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000200931 |
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| Registros recuperados: 10 | |
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