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| Registros recuperados: 2.661 | |
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| Oliveira-Longatti,Silvia Maria de; Cannata,Marcele Gabriel; Ferrazani,Júlia Costa; Carvalho,Teotonio Soares de; Ciavatta,Claudio; Guilherme,Luiz Roberto Guimarães. |
| ABSTRACT Nitrogen (N) is an important nutrient for agriculture, and Brazil is heavily dependent on N imports. A by-product of the intermediate processes of tanning (BPIPT) may be used as an N fertilizer which will reduce this dependency, but its chromium (Cr) content is a matter of concern. This work assessed Cr (III, VI) and N (total, inorganic) contents in four soil samples with contrasting characteristics (especially with respect to their content of manganese (Mn), a potential Cr(III) oxidant), following the addition of the BPIPT. Chemical and microbiological indicators of soil quality were measured to assess the agronomic and environmental implications of the BPIPT addition in Brazilian soils. Our results indicate that the BPIPT is a promising source... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: High-Mn soils; Agronomic efficiency; Trivalent chromium; Hexavalent chromium; Microbiological parameters. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300250 |
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| Silva,Jorge Alberto Gonçalves da; Costa,Paulo Mafra de Almeida; Marconi,Thiago Gibbin; Barreto,Everton Jean da Silva; Solís-Gracia,Nora; Park,Jon-Won; Glynn,Neil Charles. |
| ABSTRACT: Among the species related to sugarcane, Saccharum spontaneum (L.) is a wild species with the greatest potential as a source of genetic variation to cope with biomass production in harsh environments. Due to its high yield, early vigor, ratooning ability, low input requirements and tolerance to various biotic and abiotic stresses, sugarcane breeders have shown interest in its contribution, as a donor of genes, to the development of high biomass energy canes. The conservation, evaluation and utilization of the genetic variability of S. spontaneum available in germplasm collections are critical for breeding, but, given the aggressive rhizomatous growth habit and the ability to propagate via seed dispersal, S. spontaneum is classified as a noxious... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Molecular markers; Yield; Bioenergy; Abiotic stress; Core collection. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400329 |
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| Miotto,Lidiane Carla Vilanova; Mota,Renata Vieira da; Souza,Claudia Rita de; França,Danilo Vieira Cardozo; Dias,Frederico Alcântara Novelli; Pimentel,Rodrigo Meirelles de Azevedo; Dal'Osto,Marite Carlin; Regina,Murillo de Albuquerque. |
| 'Bordô' grapevines (Vitis labrusca) have great relevance to viticulture due to the quality they can impart to wines and juices. However, this cultivar has high variation in yield, ranging from 6 to 11 t ha-1. The use of clones with superior genetic potential related to scions currently marketed may increase crop profitability and revitalize its cultivation. The aim of this study was to evaluate the agronomical responses of twelve clones of the Bordô cultivar selected over a period of 15 years according to yield and quality. The vineyard was planted in 2008. Grape plants were grafted onto '1103 Paulsen' rootstock and trained on vertical shoot positioning. The agronomical evaluations, performed in the 2011, 2012 and 2013 seasons, covered the duration of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis labrusca; Productivity; Quality; Composition; Anthocyanins. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600003 |
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| Bertoldo,Juliano Garcia; Coimbra,Jefferson Luís Meirelles; Guidolin,Altamir Frederico; Andrade,Luciano Rogério Braatz de; Nodari,Rubens Onofre. |
| Plant breeding efficiency relies mainly on genetic diversity and selection to release new cultivars. This study aimed to identify landraces with favorable characteristics that can be used as parents of segregating populations in common bean (Phaseolus vulgaris L.) breeding programs. Firstly, ten bean genotypes were selected because they showed promising agronomic performance, and the following seven adaptive traits of four commercial bean cultivars were evaluated: i) plant height; ii) diameter of the stem; iii) height of the insertion of the first pod; iv) pod number per plant; v) grain number per pod; vi) weight of a thousand grains and vii) grain yield. The accessions BAF 07, BAF 44, and BAF 45 are promising in terms of increasing plant height, and... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200005 |
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| Leão,Patrícia Coelho de Souza; Chaves,Agnaldo Rodrigues de Melo. |
| ABSTRACT The aim of this research was to study the influence of training system and rootstock on the yield, vigor and physiology of the ‘Chenin Blanc’ grapevine at São Francisco Valley, northeastern Brazil. An experiment was carried out on eight harvests, from 2013 to 2017, in Petrolina, in the state of Pernambuco. Grapevines were grown under two training systems, lyre and espalier, and five rootstocks: ‘IAC 572’, ‘IAC 313’, ‘IAC 766’, ‘Paulsen 1103’ and ‘SO4’, using a split-plot randomized block design, with training systems assigned to the main plot and the rootstock assigned to the subplot. Lyre favored an increase in the number of bunches, branches and leaf mass in the harvest of the first semester of the year, while in the second semester there were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis vinifera; Tropical viticulture; Yield; Vigor. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000100601 |
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| Dias,Túlio José Mendes; Maluf,Wilson Roberto; Faria,Marcos Ventura; Freitas,Joelson André de; Gomes,Luiz Antonio Augusto; Resende,Juliano Tadeu Vilela; Azevedo,Sebastião Márcio de. |
| Post-harvest shelf life of tomato fruit may be increased by deploying mutant alleles which affect the natural ripening process and/or by a favorable genotypic background. Among the several ripening mutant genes, alcobaça (alc) has proved to be highly efficient in increasing shelf life of commercial tomato fruits, especially in heterozygosis, a state at which no limiting deleterious effects upon fruit color occur. The effects of heterozygosity in the alcobaça locus (alc+/alc) on yield and fruit quality traits of tomato hybrids with three genotypic backgrounds. We evaluated three pairs of hybrids obtained from crosses between the near-isogenic pollen source lines Flora-Dade (alc+/alc+) and TOM-559 (alc/alc), and three maternal lines (Stevens, NC-8276 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lycopersicon esculentum; Alcobaça; Ripening mutant; Long shelf-life. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200010 |
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| Oliveira,Wladecir Salles de; Oliveira,Patrícia Perondi Anchão; Corsi,Moacyr; Duarte,Fábio Rodrigo Sanches; Tsai,Siu Mui. |
| The efficiency of the symbiotic process between alfalfa (Medicago sativa L.) and Sinorhizobium meliloti can be drastically affected by soil nitrogen. This research evaluates how mineral fertilization affects the contribution of symbiosis to the yield and quality of alfalfa in two experiments under controlled conditions, and a third one in the field. Under controlled conditions, positive effect of nitrogen fertilizer was observed, whereas, in the field, negative effect of the mineral nitrogen (450 kg ha-1 year-1) on the symbiotic process was observed, with reduction of nodulation and nitrogenase activity. However, there was no effect on yield, total nitrogen concentration, crude protein, non-protein nitrogen and digestibility in relation to the treatment... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Medicago sativa L.; Biological nitrogen fixation. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400013 |
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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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| Scheffer-Basso,Simone Meredith; Jacques,Aino Victor Ávila; Dall' Agnol,Miguel. |
| A análise da alocação da biomassa e a correlação entre variáveis morfofisiológicas permitem maior entendimento do estabelecimento, produção e persistência de espécies perenes, em trabalhos de melhoramento genético, manejo e ecologia de plantas forrageiras. Este trabalho teve o objetivo de analisar a alocação de biomassa em leguminosas forrageiras (Adesmia latifolia, A. punctata, A. tristis, Lotus corniculatus, L. uliginosus). O experimento foi conduzido em casa de vegetação durante 210 dias (4000 graus-dia); as plantas foram cultivadas em caixas de 1 m². Nesse período, foram retiradas amostras periódicas para avaliação dos componentes morfológicos e descrição do hábito das espécies. A alocação da biomassa em raízes, caule e folha foi expressa em... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adesmia; Lotus; Índice de área foliar. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400002 |
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| Frizzone,J.A.; Botrel,T.A.; Arce,R.A.B.; Péres,F.C.. |
| Com o objetivo de desenvolver um modelo de programação linear para simular os níveis das atividades do processo de produção, utilizou-se o sistema de produção da fazenda Lagoa do Fogão, propriedade da família Sakai, localizada no município de Guaíra,SP, com um total de 207 ha irrigados por três sistemas de irrigação do tipo pivô-central. A função objetivo consistiu em maximizar o lucro da propriedade agrícola, utilizando as culturas de inverno tradicionalmente cultivadas nessa propriedade, sob regime de irrigação, a saber: tomate industrial, trigo, batata, ervilha e feijão. As restrições foram quanto à disponibilidade de terra, água e mercado. Os resultados obtidos, permitiram as seguintes conclusões: (a) na área sob o pivô-central 1 deve-se cultivar... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Programação linear; Alocação de água; Pivô-central. |
| Ano: 1994 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300026 |
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| CAMARGO,O.A. de; CASTRO,O.M. de; VIEIRA,S.R; QUAGGIO,J.A. |
| A calagem é essencial na agricultura moderna para aumentar a produtividade das culturas e a eficiência do uso de adubos. A adição de calcário normalmente altera atributos químicos do solo. O objetivo do presente estudo foi verificar algumas dessas alterações no horizonte superficial de um latossolo vermelho-escuro argiloso e um podzólico vermelho-amarelo textura média/argilosa. Os atributos estudados foram: soma de bases, pH em H2O e KCl N, Al3+, H+, capacidade de troca catiônica (CTC) a pH 7,0 e ao pH do solo, capacidade de troca aniônica (CTA), fosfato e sulfato extraíveis, índice de adsorção de P e disponibilidade de Fe, Mn, Zn e Cu. Com os dados obtidos pôde-se concluir que a calagem aumentou o pH, a soma de bases, a CTC a pH do solo e o teor de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calagem; Latossolo; Podzólico; Atributos químicos. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100001 |
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| Jonsson,Claudio Martín; Ferracini,Vera Lúcia; Paraíba,Lourival Costa; Rangel,Maurício; Aguiar,Sandra Regina. |
| O paclobutrazol, um regulador de crescimento vegetal com propriedades fungicidas, é muito utilizado na região Nordeste do Brasil em áreas de produção de frutíferas. Este composto pode permanecer estável por vários meses após sua aplicação no solo, sendo sua meia vida na água superior a três semanas. Corpos de água superficiais nas proximidades das culturas são portanto susceptíveis de serem contaminados pelo paclobutrazol, com o risco de promover efeitos adversos para a fauna aquática e para a saúde humana. No presente trabalho foi estudada a bioconcentração e algumas alterações bioquímicas, medidas pela atividade das enzimas transaminase glutâmico-oxalacética (TGO), lactato desidrogenase (LDH) e glutationa S-transferase (GST) em tecidos do peixe pacú... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioconcentração; Peixe; Toxicidade. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300005 |
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| Registros recuperados: 2.661 | |
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