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| Registros recuperados: 2.661 | |
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| Lemos,Roxane do Carmo; Abreu,Ângela de Fátima Barbosa; Ramalho,Magno Antonio Patto. |
| ABSTRACT: When breeding the common bean in Brazil, the best progenies are chosen, normally, from solely the generation under analysis at the conclusion of the evaluation, without considering what occurred in the past. However, a number of recently published studies show that if an evaluation were to consider all relevant generations, the gain from selection could be higher, especially when an index that involves information from the population that gave rise to the progenies is used. Thus, the aim of this study was to compare three selection procedures in the evaluation of successive generations and to discuss the implications of the progeny × environment interaction in terms of success of selection. Cycle XV progenies from a bean recurrent selection... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Recurrent selection; Selection index; Mixed model approach. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101101 |
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| Sparovek,G.; Weill,M.M.; Ranieiri,S.B.L.; Schnug,E.; Silva,E.F.. |
| By definition, erosion tolerance should consider the conservation of the soil as a natural resource essential for crop production. Erosion rates greater than soil renewal will cause soil depth loss. A minimum soil depth was defined as the depth in which the inputs (fertilizers, crop residues) and management technology (irrigation, improved genetic crop quality) were insufficient to prevent economic productivity loss. Thus, erosion rates greater than soil formation are acceptable only during the time in which the soil does not reach the minimum depth. We have defined this time period as life-time. The life-time concept was applied to the Ceveiro watershed (1,945 ha) located in a sugarcane growing region in the Southeast of Brazil Erosion rates were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Erosion tolerance; Life-time. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300015 |
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| Caruso,E.C.; Oliveira,A.J. de. |
| O principal objetivo deste trabalho foi verificar a aplicabilidade do método de Acton na determinação de lactose em queijo tipo Minas Frescal e, para isso estudou-se a porcentagem de recuperação de lactose adicionada a amostras dos queijos, em diferentes situações. As recuperações variam de 99,1% e 103,7% , e os melhores resultados em torno de 100%, obtidos para as amostras preparadas contendo até 40 <FONT FACE="Symbol">m</font>g de lactose / ml. Os queijos tipo Minas Frescal, de três lotes diferentes com três queijos por lote, foram adquiridos no comércio de Piracicaba, SP aos dois dias de fabricação e nesse mesmo dia, analisados para o teor de lactose. Os resultados variaram de 2,36% a 2,47% no lote 1; 2,68% a 3,03% no lote 2 e 2,19% a 2,48%... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Queijo; Lactose; Carboidratos; Laticínios. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100033 |
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| Camacho,R.G.; Garrido,O.; Lima,M.G.. |
| Se caracterizaron nueve materiales genéticos de maíz (Arichuna, Baraure, Braquítico, Experimental-2, Foremaíz PB, FM-6, Obregón, Proscca-71 y Tocorón), en relación con área promedio de hoja por planta, área foliar total por planta (AFT), índice de área foliar (IAF), y coeficiente de extinción de luz (K) a 0,50 m, 1,00 m, 1,50 m, 2,00 m y 2,50 m de altura de la planta (medidos a partir del suelo). Además, estudios de correlación y regresión simple fueron hechos entre rendimiento (R) y IAF. Se encontraron rangos de variación para las diversas variables: Area promedio de hoja por planta(471cm² para Foremaiz PB y 606 cm² para Baraure); AFT ( 5 327cm² en Foremaiz PB y 8 411 cm² para Braquítico); IAF (4,26, Foremaiz PB y 6,67, Braquítico); K (0,23 para... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Maíz; Índice de área foliar; Coeficiente de extinción de luz; Rendimiento. |
| Ano: 1995 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200015 |
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| Giaveno,Carlos Daniel; Miranda Filho,José Branco de. |
| Genetic improvement is a useful approach to increase aluminum tolerance in maize. This experiment was carried out to compare two screening techniques under greenhouse conditions and estimate the association between the results obtained for both bioassays with grain yield. Nutrient solution (NS) and pots with acid soil (AS) were utilized as screening methodologies to perform one cycle of divergent selection for aluminum tolerance in the tropical maize population SIKALQ. The four sub-populations obtained by both approaches were compared with the original and checks in a greenhouse and in multilocation field trials. Evaluation under the conditions of NS and AS showed that the populations with the best performances were those selected for aluminum tolerance... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Zea mays; Acid soils; Stress; Divergent selection. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400028 |
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| Verdial,Marcelo Fontanetti; Lima,Márcio Santos de; Morgor,Átila F.; Goto,Rumy. |
| Mulches bring several benefits to lettuce cultivation. This work evaluated the effect of mulches on the cultivation of iceberg lettuce, cv. Lucy Brown. The treatment plots were: 1- no mulch and no weed control (control); 2- no mulch and weed control every 15 days; 3- sugarcane bagasse mulch of 2 cm thickness; 4- black plastic mulch; 5- double-faced plastic mulch (silver/black). Data were collected in regard to plant cycle when in the field, amount of chlorophyll in the leaves, productivity (individual weight per head) and amount of nutrients absorbed by the leaves. Double-faced plastic mulch provides the highest productivity and the highest values for the amount of chlorophyll, nitrogen, phosphorus, sulfur, boron and iron accumulation in the leaves. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa; Mulching; Soil temperature; Nutrient. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400014 |
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| Hernandez,F.B.T.; Suzuki,M.A.; Buzetti,S.; Correa,L.S.. |
| Com o objetivo de avaliar a resposta da cultura da figueira (safra 91/92) à aplicação de lâminas de irrigação e adubação nitrogenada realizou-se um experimento com seis lâminas de irrigação (O, 25, 50, 75,100 e 125% da evaporação do Tanque Classe A) e seis níveis de nitrogênio (0,150,300,450,600 e 750 g/planta), instalado de acordo com um delineamento de blocos casualizados, em um esquema de parcelas sub-divididas, com quatro repetições. Com base na análise estatística realizada, verificou-se efeito significativo da irrigação sobre a produtividade de frutos maduros, produtividade total, comprimento de ramos e altura e diâmetro de frutos maduros. A adubação nitrogenada mostrou efeito significativo sobre a produtividade de frutos maduros e comprimento de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Figo; Irrigação; Nitrogênio. |
| Ano: 1994 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100016 |
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| Kubota,Aki; Hoshiba,Kent; Bordon,Jorge. |
| A no-tillage soybean-wheat cropping system has been practiced for many years on the "Terra Rossa" soils of eastern Paraguay. Soil compactness and soil erosion have recently been identified as potential problems. This study examines the effect of replacing unprofitable wheat by green-manure turnip (Raphanus sativus L. var. oleiferus Metzg.) on soil properties and soybean production. Gaseous phase, porosity, bulk density, water saturation, cone index, pH, exchangeable-cations, available-phosphorus (P) and aggregate size distribution of the soil were measured. Contrary to initial expectations, turnip did not reduce soil compactness. Instead, turnip stabilized the aggregate structure of the surface soil. Positive effects of turnip on subsequent soybean growth... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil compactness; Aggregate structure; Crop residue; Nutrient return. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200010 |
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| Oliveira,Dimas Estrasulas de; Silva,Sila Carneiro da. |
| Knowledge of information relative to the digestibility, intake and botanical and morphological composition of the diet is important in nutritional studies, since it provides the basis for understanding aspects related to the ingestive behavior and selectivity of animals. N-alkanes have been used successfully as markers in studies with many species of animals, particularly domesticated ruminants, most of the times as replacements for conventional markers as chromium oxide for example. However, for wild ruminants and non-ruminant animals information on this technique is still scarce and, as a consequence, its potential for use unknown. This review reports the use of this technique in studies of feed digestibility, intake and diet composition with wild... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digestibility; Diet composition; Feed intake; Forages; Hydrocarbons. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600015 |
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| Coelho,Fábio Cunha; Coelho,Enilce Maria; Egerer,Monika. |
| ABSTRACT: This paper aims to examine the issue raised by the consumption of locally produced food in all its various aspects, and in particular, addresses how this practice contributes to local and global sustainability. It analyzes the different definitions of local food, the strategies used, the implications of the distance traveled in the transportation of food to the consumer's table – food miles, the relationships between local food consumption and sustainability, farming practices that reduce carbon emissions, contribution of urban agriculture to local food, local trading of food produced by rural farmers, as well as a number of relationships between the consumption of local food and human nutrition and health, local food protection and the ability... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Food consumption; Food miles; Greenhouse gases; Sustainability. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100084 |
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| Jesus,Monalisa Santana Coelho de; Santiago,Manuela Cristina Pessanha de Araújo; Pacheco,Sidney; Gouvêa,Ana Cristina Miranda Senna; Nascimento,Luzimar da Silva de Mattos do; Borguini,Renata Galhardo; Guerra,José Guilherme Marinho; Espindola,José Antonio Azevedo; Godoy,Ronoel Luiz de Oliveira. |
| ABSTRACT Acylated anthocyanins from a purple-fleshed sweet potato (PFSP), obtained by organic cultivation in Brazil, were characterized after separation by a high performance liquid chromatography-diode array detector (HPLC-PDA). These anthocyanins were manually collected at the detector output, concentrated and injected into a high resolution mass spectrometer (ESI-QTOF-MS2). Twenty-two acylated anthocyanins were detected. Among them, sixteen had been reported in the literature and six, derived from peonidin were reported for the first time in sweet potato roots in this study. These compounds showed molecular ions with accurate mass/charge ratios (m/z) of 909.2081, 961.3010, 961.2571, 963.3345, 1123.2932 and 1179.3862. Although anthocyanins in PFSP have... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phenolic; Mass spectrometry; Natural dye; Antioxidant. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000400901 |
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| SENTELHAS,P.C.; UNGARO,M.R.G.. |
| Foram avaliados cinco índices bioclimáticos para a estimativa da duração do ciclo de dois cultivares e de um híbrido de girassol, em Monte Alegre do Sul, SP. Os índices avaliados foram: índice térmico (IT); unidades heliotérmicas (UH); acúmulo da radiação fotossinteticamente ativa (ARFA); índice heliotérmico de Geslin (IHG); acúmulo da evapotranspiração potencial (AETP). Foram avaliados dois cultivares, IAC-Anhandy e VNIIMK, e o híbrido Contisol-621, os quais foram semeados mensalmente, totalizando 22 épocas distintas, variando de 14/01/88 a 19/01/90. Através do CV(%) foi possível verificar que o IT foi o índice que apresentou a menor variação ao longo das diferentes épocas de semeadura, com valores de CV de 4,5 e 5,9%, respectivamente, para os cultivares... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Girassol; Índice bioclimático; IAC-Anhandy; Contisol-621; VNIIMK. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100013 |
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| Mathioni,Sandra Marisa; Carvalho,; Brunelli,Kátia Regiane; Beló,André; Camargo,Luis Eduardo Aranha. |
| For many years, the gray leaf spot disease (GLS) caused by the fungus Cercospora zeae-maydis Tehon & Daniels, was not considered an important pathogen of maize (Zea mays, L.) in Brazil. However, the recent adoption of agronomical practices such as no-tillage and cultivation under central pivot irrigation systems increased the incidence and severity to the extent that GLS is now one of the most important diseases of maize. Isolates of C. zeae-maydis can be distinguished by two genetic groups (I and II) based on AFLP markers and on polymorphisms of the ITS and 5.8S rDNA regions. Until now, however, the biological implications of this distinction remain unclear. This study investigated whether isolates from the two genetic groups differ in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disease resistance; Gray leaf spot; Genetic variability; Pathogenicity. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600006 |
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| Registros recuperados: 2.661 | |
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