Consulta: subjectFacets:"Shading"
Registros recuperados: 35
Data/hora: 05/06/2024 14:20:25

Relaciones entre radiación solar, desarrollo y calidad de cactáceas ornamentales
Provedor de dados: 32
Autores: Sánchez Pérez, Anna Magali.
Las cactáceas tienen flores y características morfológicas atractivas que las hacen plantas  ornamentales muy apreciadas; se utilizan principalmente como ornato en exteriores pero  algunas también se pueden utilizar como plantas de interior; sin embargo, en interiores hay  bajos niveles de radiación fotosintéticamente activa (RFA), lo que influye en su crecimiento,  desarrollo y vida útil. En México hay poca investigación sobre el tema, por lo que el objetivo  de esta investigación fue analizar el efecto de diferentes niveles de RFA en el crecimiento,  periodo de floración y contenido de pigmentos (clorofila “a”, “b”, carotenoides y betalaínas)  en cuatro especies y analizar su capacidad de adaptación a bajos niveles de RFA. Las  especies fueron Rebutia...
Tipo: Tesis
Palavras-chave: Floración; Sombreo; Pigmentos; Copiapoa tenuissima; Echinopsis chamaecereus “aurea”; Rebutia heliosa; Rebutia muscula Flowering; Shading; Pigments; Copiapoa tenuíssima; Echinopsis chamaecereus aurea; Rebutia heliosa; Rebutia muscula.
Ano: 2012
URL: http://hdl.handle.net/10521/1056

Relaciones entre radiación solar, desarrollo y calidad de cactáceas ornamentales
Provedor de dados: 32
Autores: Sánchez Pérez, Anna Magali.
Las cactáceas tienen flores y características morfológicas atractivas que las hacen plantas  ornamentales muy apreciadas; se utilizan principalmente como ornato en exteriores pero  algunas también se pueden utilizar como plantas de interior; sin embargo, en interiores hay  bajos niveles de radiación fotosintéticamente activa (RFA), lo que influye en su crecimiento,  desarrollo y vida útil. En México hay poca investigación sobre el tema, por lo que el objetivo  de esta investigación fue analizar el efecto de diferentes niveles de RFA en el crecimiento,  periodo de floración y contenido de pigmentos (clorofila “a”, “b”, carotenoides y betalaínas)  en cuatro especies y analizar su capacidad de adaptación a bajos niveles de RFA. Las  especies fueron Rebutia...
Tipo: Tesis
Palavras-chave: Floración; Sombreo; Pigmentos; Copiapoa tenuissima; Echinopsis chamaecereus “aurea”; Rebutia heliosa; Rebutia muscula; Maestría; Fisiología Vegetal; Flowering; Shading; Pigments.
Ano: 2008
URL: http://hdl.handle.net/10521/1390

PHYSIOLOGICAL RESPONSES OF DAIRY COWS AS A FUNCTION OF ENVIRONMENT IN HOLDING PEN
Provedor de dados: 70
Autores: Silva,Danilo Corrêa; Passini,Roberta.
ABSTRACT This research aimed to assess the climatization configuration in a holding pen for dairy cattle considering physiological responses of animals and thermal comfort indexes. Experimental design consisted of 16 cows in a Latin square design containing four groups of four animals (G1, G2, G3 and G4) and four periods (P1, P2, P3 and P4), in which four environments were used as treatments: EXT – external environment (control); SHA – shading with polypropylene mesh, 80% light interception; S+S – shading and water sprinkling; and S+S+V – shading, sprinkling and ventilation. Dry and wet bulb temperature, black globe temperature, wind speed and humidity were recorded during the climatization process, between October 13 and December 7. Subsequently,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Shading; Adiabatic evaporative cooling system; Thermal indexes.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000200206

Effects of light intensity modification by reflective aluminized screenhouse on sweet pepper growth and yield
Provedor de dados: 70
Autores: Ferreira,Regis de C.; Bezerra,Ricardo de S.; Rosa,Juliano Q. S.
Sweet pepper is one of the ten most consumed vegetables in world. Although it develops better under protected environment, the cultivation in tropical countries is practiced in open field due greenhouse structure higher costs. Unfortunately, such practice has compromised the crop to reach either best yield or fruit quality. Since production and cost are the most important criteria for agricultural production, we aimed to evaluate reflective aluminized polypropylene shading net influence on sweet pepper (Capsicum annuum L.) growth and production as intermediary alternative for low/middle income producers from Brazilian tropical regions. Sweet pepper Magali R hybrid was cultivated in two environments: FC - field conditions (control) and RS - reflective...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum L.; Shading; Photosynthetically active radiation; Solar radiation use efficiency.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000400003

Growth and production of basil under different luminosity and water replacement levels
Provedor de dados: 75
Autores: Oliveira,Rívia de Souza Vaz; Salomão,Leandro Caixeta; Morgado,Hélber Souto; Sousa,Cleiton Mateus; Oliveira,Henrique Fonseca E de.
ABSTRACT Basil is used as spice and for medicinal purposes. Its growth is influenced by environmental factors, mainly soil moisture and air temperature. Thus, this study was installed to evaluate growth and production of basil under different levels of luminosity and water replacement. The experimental design was completely randomized, with six replicates, arranged in split plot scheme, with three luminosity levels in the plots (full sun, 50% and 70% shading) and four water replacement levels in the subplots (25, 50, 75 and 100% ETc). We evaluated plant height, stalk diameter, number of leaves and branches, root system volume, the largest root length, fresh and dry mass of roots and leaves. Data were submitted to variance analysis to observe significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ocimum basilicum; Shading; Water deficit.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000300324

Nitrate concentration in lettuce leaves depending on photosynthetic photon flux and nitrate concentration in the nutrient solution
Provedor de dados: 75
Autores: Cometti,Nilton Nélio; Martins,Madlles Q; Bremenkamp,Cintia Aparecida; Nunes,José Arcanjo.
The nitrate accumulation in plant tissues can occur due to low light availability. However, published studies have not linked nitrate accumulation to photosynthetic photon flux (PPF) measured during the growing period. This study aimed to evaluate the effect of the reduction of photosynthetic photon flux and the concentration of nitrate in the nutrient solution on agronomic characteristics and accumulation of nitrate in lettuce grown in hydroponics. The trial design was entirely randomized in a factorial scheme (4 x 2) with three repetitions, and four shading levels: 0, 30, 50, and 80% and two nitrate levels in nutrient solution: 5 and 10 mmol L-1. The dry matter production decreased directly and linearly with the reduction of light. The lowest level in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa L; Hydroponic crop; Shading; Nitrate accumulation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362011000400018

Yacon planting density in intercropping with corn under banana orchard
Provedor de dados: 75
Autores: Teixeira,Ariany das Graças; Oliveira,Fábio Luiz de; Parajara,Magno do C; Zucoloto,Moises; Dalvi,Leandro P.
ABSTRACT Yacon is a crop which requires development of strategies for its cultivation. One of the possibilities is to introduce yacon in perennial crops using intercropping system. The aim of this study was to evaluate different planting densities of yacon grown in intercropping with corn under banana orchard, verifying its development and production. At 90 days after planting, morphological and physiological evaluations were done, at 210 days yacon was harvested, and its productivity calculated using the fresh tuberous root production. The Area Equivalence Index (IEA), and the Relative Contribution of Crops (CRC) to IEA were calculated. Yacon development and production were hampered by the corn intercropping (under the banana orchard), regardless of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Smallanthus sonchifolius; Spacing; Polyculture; Shading.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000100083

Grau de infestação da traça-da-castanha em clones de cajueiro-anão consorciados com fruteiras.
Provedor de dados: 14
Autores: FERREIRA, F. I. G.; MESQUITA, A. L. M.; MOTA, M. do S. C. de S.; FUCK JUNIOR, S. C. de F.; MIRANDA, F. R. de.
A traça-da-castanha (Anacampsis phytomiella) é a praga mais importante do período de frutificação do cajueiro porque ataca o fruto (castanha), causando elevados prejuízos por destruir completamente a amêndoa da castanha de caju. O principal sintoma de ataque é a presença de um furo localizado na parte distal da castanha e é conhecido pelo produtor como castanha furada. O adulto é uma pequena mariposa de hábito noturno, com cerca de 1,5 cm de envergadura, coloração escura, com pequenas manchas claras nas asas. O objetivo deste trabalho foi investigar a infestação da traça-da-castanha nos clones de cajueiro-anão CCP 76, BRS 226, BRS 189, cultivados em consorciação com as fruteiras, banana, mamão e melancia, no Campo Experimental da Embrapa Agroindústria...
Tipo: Parte de livro
Palavras-chave: Anacampsis phytomiella; Pest; Shading; Anacardium Occidentale; Praga de Planta; Consorciação de Cultura; Sombreamento; Anacardium; Intercropping.
Ano: 2022
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1144477

Microclimate and development of 'Conilon' coffee intercropped with rubber trees
Provedor de dados: 86
Autores: Partelli,Fábio Luiz; Araújo,André Vasconcellos; Vieira,Henrique Duarte; Dias,Jairo Rafael Machado; Menezes,Luis Fernando Tavares de; Ramalho,José Cochicho.
The objective of this work was to evaluate the influence of intercropping 'Conilon' coffee (Coffea canephora) with rubber trees on coffee tree microclimate, nutrition, growth, and yield. Rubber trees were planted in two double rows 33 m apart, with 4x2.3 m spacing between plants. Treatments consisted of the distances from the coffee plants to the rubber trees: 3, 6, 9, 12, and 15 m. Measurements of atmospheric variables (temperature, irradiance, and relative humidity), leaf nutrient concentration, internode length of plagiotropic and orthotropic branches, individual leaf area, chlorophyll content, and yield were performed. Intercropping promotes changes in the microclimatic conditions of coffee plants close to rubber trees, with reduction of temperature...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea canéfora; Hevea brasiliensis; Irradiance; Monoculture; Shading.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014001100872

Bioindicators of soil quality in coffee organic cultivation systems
Provedor de dados: 86
Autores: Pimentel,Márcio Sampaio; De-Polli,Helvécio; Aquino,Adriana Maria de; Correia,Maria Elizabeth Fernandes; Rouws,Janaina Ribeiro Costa.
The objective of this work was to assess the effect of different coffee organic cultivation systems on chemical and biological soil characteristics, in different seasons of the year. The following systems were evaluated: coffee intercropped with one (CJ1), two (CJ2) or three (CJ3) pigeon pea (Cajanus cajan) alleys; coffee planted under full sun (CS); area planted with sweet pepper and snap bean in a conventional tillage system (AC); and secondary forest area (FFR). Row spacing in CJ1, CJ2, CJ3 and CS was 2.0x1.0, 2.8x1.0, 3.6x1.0, and 2.8x1.0 m, respectively. Soil samples were collected at 10-cm depth, during the four seasons of the year. The results were subjected to analysis of variance, principal component analysis, and redundancy analysis. There was an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cajanus cajan; Coffea arabica; Edaphic macrofauna; Metabolic quotient; Shading; Soil microbial biomass.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000500013

Management Of Commelina benghalensis with Saflufenacil in Shaded Environments
Provedor de dados: 87
Autores: SANTOS JUNIOR,A.; FREITAS,F.C.L.; SANTOS,I.T.; SILVA,D.C.; PAIXÃO,G.P.; SEDIYAMA,C.S.
ABSTRACT: The repetitive use of glyphosate in the control of weeds in eucalyptus plantations has selected tolerant species such as Commelina benghalensis. Therefore, the use of herbicides of other mechanisms of action, such as saflufenacil, in rotation or combination with glyphosate, is necessary to reduce damages caused by C. benghalensis, whose sensitivity to herbicides can be influenced by the shading caused by the eucalyptus crop. This study aimed to assess the efficiency of saflufenacil in the management of C. benghalensis at different shading levels. Three experiments were carried out regarding a certain shading level (cultivation environment with 0, 40, and 55% shade). The experimental design was a randomized block design with five herbicide doses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Shading; Chemical control; Biomass allocation; Weed; Benghal dayflower.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100249

Comportamento de plântulas de Sclerolobium paniculatum Vog. var. rubiginosum (Tul.) Benth. sob diferentes níveis de sombreamento, em viveiro
Provedor de dados: 88
Autores: FELFILI,JEANINE MARIA; HILGBERT,LUÍS FERNANDO; FRANCO,AUGUSTO CÉSAR; SOUSA-SILVA,JOSÉ CARLOS; RESENDE,ALBA VALÉRIA; NOGUEIRA,MARIA VALDENETE PEREIRA.
As perturbações por desmatamentos, queimadas e mineração nas matas de galeria estão se avolumando em função do desenvolvimento econômico, gerando desequilíbrio ecológico e tornando necessários estudos que possibilitem a recuperação deste ecossistema. O objetivo deste trabalho foi o de avaliar, em viveiro, a resposta da espécie Sclerolobium paniculatum submetida a quatro níveis de sombreamento. O delineamento experimental foi inteiramente casualizado, com quatro tratamentos e quinze repetições. Cada tratamento representou uma fase da sucessão em floresta natural: pleno sol, simulando uma condição de área degradada; condição de clareira, com aproximadamente 50% de sombreamento; dossel da mata, em fase de fechamento, com sombreamento médio de 70%; dossel...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gallery forests; Light; Shading; Brazil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000500011

Effect of light and temperature on germination and early growth of Vochysia tucanorum Mart., Vochysiaceae, in cerrado and forest soil under different radiation levels
Provedor de dados: 88
Autores: BARBOSA,ANDRÉA RODRIGUES; YAMAMOTO,KIKYO; VALIO,IVANY F. M.
Vochysia tucanorum Mart. (Vochysiaceae) is a very widely distributed species in the cerrado and forests in Brazil, from the State of Bahia to Paraná. Its seed germination was analysed under eight treatments using different conditions of light and temperature. Up to 73 days, at least ca. 93% of the seeds germinated in all treatments, except under alternating temperatures of 35°/10°C (62%). Light enhanced germination, except under constant temperature of 25°C when seeds are not photoblastic. At this temperature, the highest percentage of germination was found. Initial vegetative growth was analysed by comparing the effects of shading, by means of different percentages of full daylight (100%, 45%, 10.6%, 4.8%), and soils from cerrado and forest. During 123...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; Seedling growth; Shading; Vochysia tucanorum; Soil; Cerrado.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000500008

Light intensity and type of container on producing Cassia grandis L. f. seedlings
Provedor de dados: 91
Autores: Leal,Caio C. P.; Torres,Salvador B.; Freitas,Rômulo M. O. de; Nogueira,Narjara W.; Farias,Raul M. de.
ABSTRACTThis study aimed to determine the effects of the luminosity and type of container on producing Cassia grandis seedlings. Thus, in a substrate composed by topsoil + wood powder (1:1) the seedlings were grown into plastic tubets containing 0.3 dm3 of such substrate, or into plastic pots containing 1.0 dm3 of the same substrate, and subjected to 50 and 25% shading or full sunlight. The assessments were performed every two weeks by measuring plant height and stem diameter, during eight weeks period. At the end of this period, the leaf area, dry mass of shoots and roots, the ratio between height of plant/diameter of stem, and the Dickson quality index were also assessed. The experiment was carried out in a completely randomized design with treatments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pink shower cassia; Forest species; Forest species seeds; Seedling growth; Shading.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001000939

Microclimate and thermal comfort indices in silvopastoral systems under different planting directions and seasons
Provedor de dados: 91
Autores: Carvalho,Rafael P. de; Heid,Debora M.; Davide,Livia M. C.; Piletti,Ligia M. M. da S.; Jesus,Fernanda L. F. de; Viegas Neto,Antonio L.
ABSTRACT The orientation of tree-rows in a silvopastoral system associated with different seasons of the year allows more or less sunlight penetration, resulting in deliberate modification of the microclimate composition and thermal conditions provided to animals. In this sense, the aims of this study were to evaluate microclimatic variables and thermal comfort indices for east-west and north-south oriented silvopastoral systems, compared to unshaded systems during summer and winter. The study was conducted at the Modelo II Farm (21° 08’ S 53° 17’ W) at an altitude of 354 m. A randomized block design in scheme of split-split plots with five repetitions was adopted. Two planting directions and a control treatment (unshaded) were evaluated in the plots....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal stress; Shading; Seasons; Eucalyptus.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000400266

Effects of shading on leaf physiology and morphology in the ‘Yinhong’ grape plants
Provedor de dados: 94
Autores: Wu,Yueyan; Qiu,Tian; Shen,ZiLi; Wu,Yanyan; Lu,Dan; He,Jingwen.
Abstract  Shading is a practical measure to reduce the heat stress to grape trees in the summer. However, inappropriate shading will cause the reduction in leaf photosynthesis and consequently the retardation of growth for the plants or the loss of fruit yield and quality for the mature grape trees. In this study we have used 1-year-old ‘YinHong’ grape plants growing under different levels of shading, ranging from full sunlight 0% to 80% reduction, to investigate their growth, physiological and biochemical responses. The results show that shading rate =45% did not significantly affect grape growth. Shading over 45% reduction of the full sunlight, the growth of the grape plants were started to be inhibited. In addition, soluble protein content, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grape; Growth characteristics; Shading.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000500201

Microclimate, development and productivity of robusta coffee shaded by rubber trees and at full sun
Provedor de dados: 124
Autores: Araújo,André Vasconcellos; Partelli,Fábio Luiz; Oliosi,Gleison; Pezzopane,José Ricardo Macedo.
ABSTRACT There are few studies about the shading of Robusta coffee with rubber trees. The aim of this study was evaluate the microclimate, development and yield of Coffea canephora grown at full sun and shaded by rubber trees. The experiment consisted of a Robusta coffee crop (Coffea canephora) grown at under full sun and another coffee crop intercropped with rubber trees (Hevea brasiliensis). The rubber trees and coffee crop were planted in the East/West direction, in Jaguaré, Espírito Santo, Brazil. Was evaluated the luminosity, temperature and relative humidity, leaf nutrient concentrations; internodes of the plagiotropic and orthotropic branches, leaf area; relative chlorophyll index, and tree yield of the coffee crops. The shading directly influenced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea canephora; Hevea brasiliens; Shading; Intercropping; Monoculture.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000400700

Soil bulk density and biomass partitioning of Brachiaria decumbens in a silvopastoral system
Provedor de dados: 63
Autores: Paciullo,Domingos Sávio Campos; Castro,Carlos Renato Tavares de; Gomide,Carlos Augusto de Miranda; Fernandes,Priscila Beligoli; Rocha,Wadson Sebastião Duarte da; Müller,Marcelo Dias; Rossiello,Roberto Oscar Pereyra.
Shade in silvopastoral systems improves the thermal comfort of animals, but it may also affect the pasture productivity and can contribute to soil compaction in the shaded areas due to the increase in the number of animals looking for comfort. The effect of grazing at various distances from tree rows (under the tree canopy, at 6 and at 12 m away from the trees) on the soil bulk density and on the aerial and root biomass of Brachiaria decumbens was evaluated in both the dry and the rainy seasons. The study was carried out on an Orthic Ferralsol in a randomized block design with two replications. Tree rows were composed of Eucalyptus grandis and Acacia mangium species, and the paddocks were submitted to a rotational stocking management, using Holstein (Bos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage mass; Root mass; Soil compaction; Shading; Shoot/root ratio.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500014

Greenhouse tomato production with electricity generation by roof-mounted flexible solar panels
Provedor de dados: 63
Autores: Ureña-Sánchez,Raúl; Callejón-Ferre,Ángel Jesús; Pérez-Alonso,José; Carreño-Ortega,Ángel.
The integration of renewable energy sources into greenhouse crop production in southeastern Spain could provide extra income for growers. Wind energy could be captured by small to medium-sized wind turbines, gas could be produced from biomass, and solar energy could be gathered by solar panels. The aim of this study was to examine the effect of flexible solar panels, mounted on top of a greenhouse for electricity production, on yield and fruit quality of tomatoes (Solanum lycopersycum L., cv Daniela). This study was undertaken in a commercial raspa y amagado greenhouse, typical of the Almería region (Spain). Tomato plantlets were planted at a density of 0.75 plants m-2. The flexible solar panels were mounted on two parts of the roof in different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersycum L.; Shading; Total production; Renewable energy; Fruit quality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400001

Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities
Provedor de dados: 39
Autores: 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

Morphological plasticity of benghal dayflower under an artificial light gradient - doi: 10.4025/actasciagron.v36i1.17388
Provedor de dados: 1
Autores: Oliveira, Perla Novais de; Universidade Estadual do Sudoeste da Bahia; Matsumoto, Sylvana Naomi; Universidade Estadual do Sudoeste da Bahia; Silva, Daniela Vieira; Universidade Estadual de Santa Cruz; Santos, Jerffson Lucas; Universidade Estadual do Sudoeste da Bahia; D'Arêde, Lucialdo; Universidade Estadual do Sudoeste da Bahia; Viana, Anselmo Eloy Silveira; Universidade Estadual do Sudoeste da Bahia.
The purpose of this study was to evaluate the effects of light restriction on the growth of benghal dayflower (Commelina benghalensis). The experiment was conducted in pots under full sunlight and with 18.5, 30, 40, 50, 60 and 70% artificial light restriction treatments. Plant growth was evaluated up to 90 days after planting (DAP), and mathematical models of the major shoot length, internode length, individual area of the first leaf completely expanded, number of leaves and shoot and root dry mass weights were established depending on increasing light restriction levels. The elevation of the light gradient promoted reductions in the number of leaves and fasciculate root dry mass weight. Light restriction did not induce alterations in the plasticity of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.01.00.00-9 Agronomia Commelina benghalensis; Shading; Growth 5.01.03.06-7 Fisiologia de Plantas Cultivadas.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17388

Growth and physiology of jelly palm (Butia capitata) grown under colored shade nets
Provedor de dados: 1
Autores: Costa, Irton de Jesus Silva; Costa, Bárbara Nogueira Souza; Assis, Franscinely Aparecida de; Martins, Adalvan Daniel; Pio, Leila Aparecida Salles; Pasqual, Moacir.
 Butia capitata (Mart.) Becc., commonly known as jelly palm, is a palm tree native to the Cerrado biome. It is considered an endangered species owing to intensive extractive exploitation of its fruits, with slow and uneven seminiferous propagation as an aggravating factor. Thereby, there are some bottlenecks related to jelly palm seedling production that needs to be optimized. Light quality and intensity is very important to seedling production, as it controls the metabolism of plants and consequently their growth and development. Thus, the aim of this work is to evaluate the effect of shade nets on the growth and physiological aspects of jelly palm seedlings. The experimental design was completely randomized, with five treatments, ten replicates and eight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Shading; Palm tree; Colored nets; Light.; Tropical fruit growing; Propagation; Native plants; Physical numbness.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/35332

Growing tropical forage legumes in full sun and silvopastoral systems
Provedor de dados: 2
Autores: Araújo, Saulo Alberto do Carmo; Silva, Tatiana Oliveira da; Rocha, Norberto Silva; Ortêncio, Marluci Olício.
Growth was evaluated three tropical forage legumes in two cropping systems: silvopastoral system (SSP) and full sun. A completely randomized design was adopted in factorial three legumes (estilosanthes cv. Campo Grande (Stylozanthes macrocephala x Stylozanthes capitata), tropical kudzu (Pueraria phaseoloides (Roxb.) Benth) and macrotiloma (Macrotyloma axillare cv. Java)) x two farming systems, with 4 repetitions. A eucalyptus SSP already deployed, with spatial arrangement of 12 x 2 m between trees was used. Legumes were planted in January 2014 a uniform cut being made in May 2014. The court assessment was carried out 125 days after the uniformity cut. There was difference for mass production of dry legumes (PMMSL) between cultivation systems, evidencing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.00.00.00-4; 5.04.00.00-2 Fabaceae; Shading; Forage production; Chemical composition.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/32537

Orientação e sombreamento do confinamento na temperatura da superfície do pelame de bovinos - DOI: 10.4025/actascianimsci.v30i2.4702
Provedor de dados: 2
Autores: Kazama, Ricardo; UEM; Roma, Cláudio Fabrício da Cruz; UEM; Barbosa, Orlando Rus; UEM; Zeoula, Lucia Maria; UEM; Ducatti, Taciana; UEM; Tesolin, Lílian Christiane; UEM.
Avaliou-se o efeito do sombreamento sobre a temperatura da superfície do pelame (TSP) de bovinos de cinco grupos genéticos, 4 &amp;frac12; Limousin + &amp;frac12; Nelore (L), 8 &amp;frac12; Limousin + &amp;frac14; Nelore + &amp;frac14; RedAngus (LR), 4 &amp;frac12; Limousin + &amp;frac14; Nelore + &amp;frac14; Simental (LS), 2 &amp;frac14; Marchigiana + &amp;frac14; Nelore + ¼ Simental (MS) e 4 ¾ RedAngus + ¼ Nelore + ¼ Guzerá (RG), com 20 meses de idade e peso médio de 300 kg, alojados em baias individuais de 10 m2 , sendo metade coberta com telhas de zinco. A dieta era isoproteica e isoenergética com relação volumoso:concentrado 67:33. A TSP do Lado 1 (L1) do confinamento, durante o dia, não diferenciou (p &gt; 0,05) entre os grupos genéticos, enquanto...
Palavras-chave: 5.04.05.00-4    Produção Animal grupo genético; Orientação da instalação; Radiação; Sombra. genetic group; Building orientation; Radiation; Shading.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/4702

Efeitos da disponibilidade de sombra sobre o desempenho, atividades comportamentais e parâmetros fisiológicos de vacas da raça Pitangueiras - DOI: 10.4025/actascianimsci.v31i3.5279
Provedor de dados: 2
Autores: Silva, Érica Carla Lopes da; UFRPE; Modesto, Elisa Cristina; UFRPE; Azevedo, Marcílio de; UFRPE; Ferreira, Marcelo de Andrade; UFRPE; Dubeux Junior, José Carlos Batista; UFRPE; Schuler, Alexandre Ricardo Pereira; UFPE.
O trabalho teve como objetivo avaliar a produção, composição e o perfil de ácidos graxos do leite, parâmetros fisiológicos e atividades comportamentais de vacas da raça Pitangueiras, submetidas à condição de pastejo com e sem acesso à sombra. O ambiente foi monitorado diariamente em uma estação meteorológica. O delineamento experimental foi o inteiramente casualizado, sendo que 20 vacas em lactação foram divididas em piquetes nos tratamentos com e sem acesso à sombra. Não houve diferença (p &gt; 0,05) entre os tratamentos quanto às variáveis fisiológicas, produção, composição e perfil de ácidos graxos do leite. Os animais com acesso à sombra buscaram o sombrite nos horários em que os índices de conforto térmico foram mais elevados. No turno da tarde os...
Tipo: Pesquisa de campo;análise laboratorial
Palavras-chave: Ácidos graxos; Comportamento; Estresse térmico; Fatores ambientais; Temperatura retal ciências agrárias acids fatty; Behavior; Environment; Heat stress; Shading; Dairy cows.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/5279

Light relations and performance of signal grass in silvopastoral system
Provedor de dados: 2
Autores: Rodrigues, Cynara Oliveira Diniz; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Araújo, Saulo Alberto do Carmo; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Viana, Maria Celuta Machado; Empresa de Pesquisa Agropecuária de Minas Gerais; Rocha, Norberto Silva; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Braz, Thiago Gomes dos Santos; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Villela, Severino Delmar Junqueira; Universidade Federal dos Vales do Jequitinhonha e Mucuri.
The aim was to evaluate the influence of different spatial arrangements of trees [(3×2)×20 m, (2×2)×9 m and 2×9 m] and sampling sites (center of row spacing and side of tree rows) with regard to the amount and quality of light in the understory of silvopastoral systems and their effects on the production and chemical composition of pasture. The experimental design was a randomized block in a split plot, with three replications. The sampling site affected absolute irradiance, photosynthetic active radiation (PAR), light interception (LI) and red/far red ratio, with higher rates in the center of spacing. There were high and positive correlations between LI/leaf area index (LAI), LI/dry mater (DM) and LAI/DM in the center and LI/LAI and FAR/DM in the side of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pastagem e Forragicultura quality of light; Shading; Spatial arrangements; Urochloa decumbens.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/22398

Influence of light on the initial growth of invasive Cryptostegia madagascariensis Bojer in the Brazilian semiarid region
Provedor de dados: 3
Autores: Brito, Selma Freire de; Pinheiro, Charles Lobo; Nogueira, Francisco Carlos Barboza; Medeiros Filho, Sebastião; Matos, Dalva Maria da Silva.
The invasion by Cryptostegia madagascariensis causes economic and environmental problems in Northeastern Brazil. Current study evaluates the initial growth of C. madagascariensis on light gradient. The experiment used 0, 30, 50 and 70% shading treatments arranged in a completely randomized design and evaluated in four periods, namely, 35, 50, 65 and 80 days. Height, absolute growth rate, relative growth rate, number of side branches, number of leaves, leaf area, specific leaf area, leaf area ratio, root mass ratio, stem mass ratio, leaf mass ratio and leaf area/root mass ratio were evaluated. Results showed that the height was greater in shade environments, and the greater the available light, the greater was the number of side branches. C....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Functional traits; Caatinga; Shading; Morphological adjustments; Biomass.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/28179

Silvopastoral system with Eucalyptus as a strategy for mitigating the effects of climate change on Brazilian pasturelands
Provedor de dados: 42
Autores: BOSI,CRISTIAM; PEZZOPANE,JOSÉ RICARDO M.; SENTELHAS,PAULO CESAR.
Abstract  The aim of the present study was to assess the effect of Eucalyptus trees in a silvopastoral system on the microclimate and the capacity of that to mitigate the effects of climate change on pasturelands. This study included an open pasture of Piatã palisadegrass and an adjacent pasture that contained both palisadegrass and East-to-West rows of Eucalyptus trees, with 15 m between rows, 2 m between trees within rows. The micrometeorological measurements were collected at several distances from the tree rows and in the open pasture. The silvopastoral system was associated with greater between-row shading when solar declination was high and greater near-tree shading when solar declination was around -22°. Both soil heat flux and temperature were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agroforestry; Microclimate; Net radiation; Shading; Soil heat flux; Windbreak.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201001

Phenotypic plasticity of Neonotonia wightii and Pueraria phaseoloidesgrown under different light intensities
Provedor de dados: 42
Autores: SANTOS,LEONARDO D.T.; CRUZ,LEANDRO R. DA; SANTOS,SAMUEL A. DOS; SANT'ANNA-SANTOS,BRUNO F.; SANTOS,IZABELA T. DOS; OLIVEIRA,ARIANE M. DE; BARROS,RODRIGO E.; SANTOS,MÁRCIA V.; FARIA,RODRIGO M.
Plants have the ability to undergo morphophysiological changes based on availability of light. The present study evaluated biomass accumulation, leaf morphoanatomy and physiology of Neonotonia wightii andPueraria phaseoloides grown in full sunlight, as well as in 30% and 50% shade. Two assays were performed, one for each species, using a randomized block design with 10 replicates. A higher accumulation of fresh mass in the shoot of the plants was observed for both species under cultivation in 50% shade, while no differences were detected between the full sunlight and 30% shade. N. wightii and P. phaseoloides showed increase in area and reduction in thickness leaf when cultivated in 50% shade. There were no changes in photosynthetic rate, stomatal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adaptation; Fabaceae; Morphophysiology; Shading.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100519

Osmotic conditioning and shading on the germination and on the initial growth of Myracrodruon urundeuva Allemão seedlings
Provedor de dados: 42
Autores: SCALON,SILVANA P.Q.; MOTA,LEANDRO H.S.; MUSSURY,ROSILDA M.
The present work aimed to evaluate the osmotic conditioning and shading on the germination and on the initial growth of aroeira seedlings. The seeds were pre-imbibed in solutions with different concentrations of PEG (polyethylene glycol) and KNO3 and incubated at 10°C and 20°C temperatures, during 0 (control), 12 and 24 hours. After these periods, the seeds were dried until they reached the initial levels of humidity. After that, they were put for germinating in BOD (Biochemical Oxygen Demand) chambers, at alternated 20-30°C. The control treatment and the pre-conditionings that presented the best results in BOD germination were selected, PEG (-1.0 MPa) + KNO3 (-1.0 MPa) and KNO3 (-1.0 MPa), with pre-imbibition for 12 h and incubated in BOD at 20°C. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aroeira; Anacardiaceae; Cerrado; Shading; PEG 6000 and KNO3.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200799

Modifications on leaf anatomy of Coffea arabica caused by shade of pigeonpea (Cajanus cajan)
Provedor de dados: 52
Autores: Morais,Heverly; Medri,Moacyr Eurípedes; Marur,Celso Jamil; Caramori,Paulo Henrique; Ribeiro,Ana Maria de Arruda; Gomes,José Carlos.
Modifications on leaf anatomy in Coffea arabica shaded with pigeonpea (Cajanus cajan), compared to cultivation under full sun, were assessed. The leaves fully exposed to sunlight presented thicker cuticles and cellular walls, narrower epidermis cells, palisade parenchyma with longer cells, thicker lacunar parenchyma, fewer intercellular spaces and a larger stomata number. Leaves under dense shade presented a narrower cuticle and cellular wall; a mesophyll with smaller volume, but with larger intercellular spaces; and epidermis with thicker cells and a smaller stomata amount, surrounded by subsidiary cells of smaller dimensions. Plants grown under full sunlight presented higher values of net photosynthesis. The results evidenced that the species C. arabica...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee; Shading; Morphology; Physiology; Agroforestry.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000600005

Partitioning of nitrate reductase activity in Coffea arabica L. and its relation to carbon assimilation under different irradiance regimes
Provedor de dados: 61
Autores: Carelli,Maria Luiza C.; Fahl,Joel I.
The distribution of in vivo nitrate reductase (EC 1.6.6.1) activity (NRA) between leaves and roots was studied in young coffee plants (Coffea arabica L.) grown in pots with watered sand in a glasshouse and irrigated with nutrient solution. The influence of irradiance regimes on the partitioning of NRA, and its relation with CO2 assimilation, was also evaluated in plants grown under approximately 20, 50 and 100% of full sunlight. Time-course of nitrate accumulation in nitrogen-starved plants showed a similar pattern in leaves and roots after supplying 15 mmol L-1 nitrate, indicating efficient ability of the roots to export nitrate to the shoot. At the same time, NRA was rapidly induced in both tissues. In shoots, NRA partitioning was synchronized among the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee; Growth; Leaf/root ratio; Nitrate assimilation; Photosynthesis; Shading.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000300006

Ecophysiology of coffee growth and production
Provedor de dados: 61
Autores: DaMatta,Fábio M.; Ronchi,Cláudio P.; Maestri,Moacyr; Barros,Raimundo S.
After oil, coffee is the most valuable traded commodity worldwide. In this review we highlighted some aspects of coffee growth and development in addition to focusing our attention on recent advances on the (eco)physiology of production in both Coffea arabica and C. canephora, which together account for 99% of the world coffee bean production. This review is organized into sections dealing with (i) climatic factors and environmental requirements, (ii) root and shoot growth, (iii) blossoming synchronisation, fruiting and cup quality, (iv) competition between vegetative and reproductive growth and branch die-back, (v) photosynthesis and crop yield, (vi) physiological components of crop yield, (vii) shading and agroforestry systems, and (viii) high-density...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arabica conilon and robusta coffee beverage quality density planting die-back flowering photosynthesis; Shading.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400014

Effects of shading on the growth, development and yield of winged bean (Psophocarpus tetragonolobus)
Provedor de dados: 65
Autores: Raai,Murthazar Naim; Zain,Nurul Amalina Mohd; Osman,Normaniza; Rejab,Nur Ardiyana; Sahruzaini,Nurul Amylia; Cheng,Acga.
ABSTRACT: An experiment was conducted to investigate the effects of different shading regimes [i.e., 60% (heavy), 30% (moderate), and 0% (control)] on 25 traits associated with the morphological features, photosynthetic gas exchange and agronomic characteristics of winged bean (Psophocarpus tetragonolobus), an underutilized protein-rich legume from the tropics. Collectively, 80% of the studied variables displayed significant differences (P&lt;0.05) between at least two shade treatments. Shading generally showed most pronounced effect on the physiological traits of the legume, whereby the stomatal conductance, photosynthetic and transpiration rate differed significantly among plants for all treatments. The non-shaded plants were observed to have superior...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphology; Physiology; Shading; Winged bean; Yield.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000200202

Plant morphology and herbage accumulation of signal grass with or without fertilization, under different light regimes
Provedor de dados: 65
Autores: Lopes,Clenardo Macedo; Paciullo,Domingos Sávio Campos; Araújo,Saulo Alberto do Carmo; Morenz,Mirton José Frota; Gomide,Carlos Augusto de Miranda; Maurício,Rogério Martins; Braz,Thiago Gomes dos Santos.
ABSTRACT: The silvopastoral system has been suggested as an alternative to recover degraded pastures in tropical regions. However, trees reduce the light available for pastures, which may affect the growth and herbage accumulation. The objective of this study was to evaluate the morphogenesis, canopy structure and herbage accumulation of signalgrass ( Brachiaria decumbens ) subjected to three light regimes (0, 20 and 70% of natural shading) and two fertilization levels (presence or absence of nitrogen, phosphorus and potassium). Leaf and stem elongation rates increased under shading but did not vary with fertilization. The leaf appearance rate was greater under fertilizer treatment but was generally similar among light regimes. The tiller density was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria decumbens; Morphogenesis; Shading; Silvopastoral system; Tiller density.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000200403