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| Registros recuperados: 11 | |
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| Goergen, Laura Camila de Godoy; Soares, Julio Cesar Wincher; Berra, Elias Fernando; Brandelero, Catize; Pereira, Rudiney Soares. |
| The objective of this study was to evaluate the performance of different spectral indices - MCARI705, R750/R700, R750/R550 and MTCI - in the description of chlorophyll seasonal dynamics in detached leaves of Eucalyptus grandis in four seasons. The study was conducted in three plots of 600 m2, in a 20 months old stand. We collected 15 leaves from three layers of canopy, totalizing 45 leaves for each season. It was used a spectroradiometer FieldSpec®3, which covers the spectral range from 350 to 2,500 nm. Variance analysis (ANOVA) and Tukey test at 5% significance level were carried out. For all spectral indices, values observed in spring were different from those from summer; the same occurred between fall and winter. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Remote sensing; Field radiometric; Chlorophyll content; Physiological process Engenharia Florestal; Sensoriamento Remoto; Fisiologia. Sensoriamento remoto; Radiometria de campo; Teor de clorofila; Processo fisiológico. |
| Ano: 2015 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/841 |
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| Cantuarias-Avilés,Tatiana; Silva,Simone Rodrigues da; Angolini,Sérgio Figueiredo; Brogio,Bruna do Amaral; Baptista,Edypol Guilherme; Micheletti,Lígia Broglio. |
| Abstract: The objective of this work was to evaluate the effects of supplemental irrigation, during winter dry season, on the water status and productivity of 'Hass' avocado (Persea Americana) trees. The experiment was carried out on a clayey Oxisol from 2014 to 2016, when extreme climatic events were recorded in the state of São Paulo, Brazil. The rainfed regime was compared with two irrigation regimes, applied during the whole and half of the irrigation run time defined by the grower, corresponding to 5,091 and 2,545 m3 ha-1 water, respectively. The following variables were evaluated: soil water tension; leaf water potential, color, and chlorophyll content; leaf and fruit abscission rates; tree size; and fruit size and yield. Supplemental irrigation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Persea americana; Canopy volume; Chlorophyll content; Fixed-time irrigation; Water logging; Yield efficiency. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102703 |
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| Bejandi,Teymur Khandan; Sedghi,Mohammad; Sharifi,Raouf Seyed; Namvar,Ali; Molaei,Peyman. |
| The objective of this work was to determine the effects of seed priming and sulfur application on cell membrane characteristics, seedling emergence, chlorophyll content and grain yield of soybean (Glycine max) in saline soil. A complete-block design in 4x3 factorial arrangement with three replicates was used to test four types of seed priming (water, auxin, gibberellin and non-priming) and three levels of sulfate availability (0, 70 and 140 kg ha-1 K2SO4). The soil had a silty loam texture with an electrical conductivity of 3.61 ds m-1, a pH of 8.2 and a saturation percentage of about 46%. Seed priming had significant effects on mean emergence rate (MER), emergence percentage, relative water content (RWC) of leaves, relative chlorophyll content, time of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Chlorophyll content; Environmental stress; Injury index; Seedling emergence. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000900007 |
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| Bastos,Edson Alves; Nascimento,Sebastião Pereira do; Silva,Everaldo Moreira da; Freire Filho,Francisco Rodrigues; Gomide,Reinaldo Lúcio. |
| The genotypes selection for drought tolerance is very important for world food production, principally in arid regions or sites with irregular rain distribution. The objective of this work was to identify cowpea genotypes with drought tolerance and water stress sensitivity characteristics. Two experiments were carried out with 20 treatments and four replications, one under water deficit during reproductive phase and another one under full irrigation. The water deficit was obtained applying half the water depth required by cowpea. The leaf area index, chlorophyll content, grain components and grain yield were evaluated. The water deficit reduced 20% the leaf area index, 16% the chlorophyll content, 175% the pod number per plant and 60% the grain yield. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Leaf area index; Chlorophyll content. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902011000100013 |
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| Aumonde,Tiago Zanatta; Pedó,Tiago; Borella,Junior; Amarante,Luciano do; Villela,Francisco Amaral. |
| This work aimed to evaluate the effect that different intensities of light have on the physiological attributes of red rice seeds and seedlings. Before and after emergence, seedlings were exposed to light levels of 35%; 65% and 100% in a greenhouse. We evaluated shoots and roots, in terms of length and dry mass, as well as leaf area and content of chlorophyll (a,b and total). In leaves and roots, we quantified the activity of superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT) and guaiacol peroxidase (POX). We determined the leaf area ratio (F A), leaf mass ratio (F W), specific leaf area (S A), and shoot/root ratio (P W). At higher light intensities, shoot length decreased, whereas root length, dry mass and number of tillers increased.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa L.; Shading; Chlorophyll content; Antioxidant enzymes. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200007 |
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| Paiva Neto,Vespasiano Borges de; Campos,Guilherme de Oliveira; Boaretto,Amanda Galdi; Zuffo,Monica Cristina Rezende; Torrezan,Mateus de Aguiar; Benetão,Jamile. |
| Aspasia variegata occurs naturally in the savanna of the Mato Grosso do Sul State, Brazil and it has been widely collected for its beautiful flowers. Additionally, its habitat has been greatly reduced and little or no investigation of its spread has been performed. Aiming to establish a protocol to obtain seedlings of the orchid A. variegata, different compositions of culture medium were tested to identify which one provided better in vitro growth and development and to assess the influence of these media in seedling acclimatisation. Thus, seeds obtained from mature capsules were inoculated in Knudson culture medium for 120 days until the protocorm stage. They were transferred to different culture media formulations, including MS and Knudson with half or... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Orchidaceae; Activated charcoal; Chlorophyll content; Acclimatisation. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013001200010 |
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| Registros recuperados: 11 | |
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