Consulta: subjectFacets:"Leaf area index"
Registros recuperados: 31
Data/hora: 12/06/2024 00:44:09

Almacenamiento de carbono en bosques manejados de pinus patula: Estimación mediante percepción remota
Provedor de dados: 32
Autores: Aguirre Salado, Carlos Arturo.
Se presenta la metodología y los resultados obtenidos sobre estimación de almacenamiento de carbono mediante técnicas de percepción remota en bosques manejados de Pinus patula en Zacualtipán, Hidalgo, México; la cual surge como una necesidad de monitoreo de los recursos  forestales a partir de los compromisos adquiridos por México en el Protocolo de Kyoto para aminorar el inminente cambio climático causado por los denominados gases invernadero (CO2). En esta tesis se estudia principalmente el carbono (CHA) (Mg/ha) aunque preliminarmente resulta necesaria la cuantificación de biomasa (BHA) (Mg/ha). De manera paralela también se estudian algunos parámetros forestales de densidad como índice de área foliar (IAF) (m2/ m2),  cobertura arbórea (COB) (%), área...
Palavras-chave: Carbono; Índice de área foliar; Cobertura arbórea; Regresión lineal; K-nn; Percepción remota; SPOT 5; Fotografía hemisferica; Bosque de Pinus patula. Carbon; Leaf area index; Canopy closure; Linear regression; K-nn; Remote sensing; SPOT 5; Hemispherical photography; Pinus patula forest.
Ano: 2012
URL: http://hdl.handle.net/10521/789

Almacenamiento de carbono en bosques manejados de pinus patula: Estimación mediante percepción remota
Provedor de dados: 32
Autores: Aguirre Salado, Carlos Arturo.
Se presenta la metodología y los resultados obtenidos sobre estimación de almacenamiento de carbono mediante técnicas de percepción remota en bosques manejados de Pinus patula en Zacualtipán, Hidalgo, México; la cual surge como una necesidad de monitoreo de los recursos forestales a partir de los compromisos adquiridos por México en el Protocolo de Kyoto para aminorar el inminente cambio climático causado por los denominados gases invernadero (CO2). En esta tesis se estudia principalmente el carbono (CHA) (Mg/ha) aunque preliminarmente resulta necesaria la cuantificación de biomasa (BHA) (Mg/ha). De manera paralela también se estudian algunos parámetros forestales de densidad como índice de área foliar (IAF) (m2/ m2), cobertura arbórea (COB) (%), área...
Tipo: Tesis
Palavras-chave: Carbono; Índice de área foliar; Cobertura arbórea; Regresión lineal; K-nn; Percepción remota; SPOT 5; Fotografía hemisferica; Bosque de Pinus patula.; Carbon; Leaf area index; Canopy closure; Linear regression; K-nn; Remote sensing; SPOT 5; Hemispherical photography; Pinus patula forest.
Ano: 2007
URL: http://hdl.handle.net/10521/1172

Evaluación cuantitativa de diez variedades de alfalfa (Medicago sativa L.).
Provedor de dados: 32
Autores: Álvarez Vázquez, Perpetuo.
En México, la alfalfa es la leguminosa más utilizada en la alimentación del ganado lechero, debido a su alto rendimiento y valor nutritivo. El objetivo del presente estudio fue evaluar las variables que determinan el crecimiento y rendimiento de diez variedades de alfalfa a intervalos de corte definidos estacionalmente. El estudio se realizó de septiembre de 2011 a septiembre de 2012 en el Colegio de Postgraduados, Campus Montecillo, Texcoco, México. Las variedades de alfalfa estudiadas fueron: Vía Láctea, Chipilo, Atlixco, Oaxaca, San Miguelito, Cuf-101, Milenia, Aragón, Valenciana y Júpiter, distribuidas aleatoriamente en un diseño experimental completamente al azar con cuatro repeticiones. El mayor rendimiento (14,510 kg MS ha-1), tasa de crecimiento...
Palavras-chave: Medicago sativa L.; Rendimiento; Radiación interceptada; Indice de área foliar; Densidad de plantas; Herbage yield; Intercepted radiation; Leaf area index; Plant density; Ganadería; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2031

Almacenamiento de carbono en bosques manejados de pinus patula: Estimación mediante percepción remota
Provedor de dados: 32
Autores: Aguirre Salado, Carlos Arturo.
Se presenta la metodología y los resultados obtenidos sobre estimación de almacenamiento de carbono mediante técnicas de percepción remota en bosques manejados de Pinus patula en Zacualtipán, Hidalgo, México; la cual surge como una necesidad de monitoreo de los recursos  forestales a partir de los compromisos adquiridos por México en el Protocolo de Kyoto para aminorar el inminente cambio climático causado por los denominados gases invernadero (CO2). En esta tesis se estudia principalmente el carbono (CHA) (Mg/ha) aunque preliminarmente resulta necesaria la cuantificación de biomasa (BHA) (Mg/ha). De manera paralela también se estudian algunos parámetros forestales de densidad como índice de área foliar (IAF) (m2/ m2),  cobertura arbórea (COB) (%), área...
Palavras-chave: Carbono; Índice de área foliar; Cobertura arbórea; Regresión lineal; K-nn; Percepción remota; SPOT 5; Fotografía hemisferica; Bosque de Pinus patula. Carbon; Leaf area index; Canopy closure; Linear regression; K-nn; Remote sensing; SPOT 5; Hemispherical photography; Pinus patula forest.
Ano: 2012
URL: http://hdl.handle.net/10521/849

Using Remote Sensing and Geographic Information Systems to Study Urban Quality of Life and Urban Forest Amenities
Provedor de dados: 7
Autores: Jensen, Ryan; Indiana State University; r-jensen@indstate.edu; Gatrell, Jay; ;; Boulton, Jim; ;; Harper, Bruce; ;.
This study examines urban quality of life by assessing the relationship between observed socioeconomic conditions and urban forest amenities in Terre Haute, Indiana, USA. Using remote-sensing methods and techniques, and ordinary least squares regression, the paper determines the relationship between urban leaf area and a population density parameter with median income and median housing value. Results demonstrate positive correlations between urban leaf area, population density, and their interaction with median income and median housing value. Furthermore, leaf area, density, and their interaction statistically account for observed variance in median income and median housing value, indicating that these variables may be used to study observed...
Tipo: Peer-Reviewed Reports
Palavras-chave: Leaf area index; Remote sensing; Urban forestry; Urban quality of life.
Ano: 2005

Influence of data acquisition geometry on soybean spectral response simulated by the prosail model
Provedor de dados: 70
Autores: Breunig,Fábio M.; Galvão,Lênio S.; Formaggio,Antonio R.; Epiphanio,José C. N.
View angle and directional effects significantly affect reflectance and vegetation indices, especially when daily images collected by large field-of-view (FOV) sensors like the Moderate Resolution Imaging Spectroradiometer (MODIS) are used. In this study, the PROSAIL radiative transfer model was chosen to evaluate the impact of the geometry of data acquisition on soybean reflectance and two vegetation indices (Normalized Difference Vegetation Index - NDVI and Enhanced Vegetation Index -EVI) by varying biochemical and biophysical parameters of the crop. Input values for PROSAIL simulation were based on the literature and were adjusted by the comparison between simulated and real satellite soybean spectra acquired by the MODIS/Terra and hyperspectral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf area index; NDVI; EVI; Reflectance; MODIS; Remote sensing.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000100018

A new method for estimating the leaf area index of cucumber and tomato plants
Provedor de dados: 75
Autores: Blanco,Flávio Favaro; Folegatti,Marcos Vinícius.
Non-destructive methods of leaf area measurement are useful for small plant populations, such as experiments with potted plants, and allow the measurement of the same plant several times during the growing period. A methodology was developed to estimate the leaf area index (LAI) of cucumber and tomato plants through the evaluation of the leaf area distribution pattern (LADP) of the plants and the relative height of the leaves in the plants. Plant and leaf height, as well as the length and width of all leaves were measured and the area of some leaves was determined by a digital area meter. The obtained regression equations were used to estimate the leaf area for all relative heights along the plant. The LADP adjusted to a quadratic model for both crops and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis sativus L.; Esculentum Mill.; Greenhouse; Leaf area index.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362003000400019

Interceptação da radiação fotossinteticamente ativa em milho verão solteiro e consorciado com braquiária sob diferentes arranjos de plantas.
Provedor de dados: 14
Autores: MAKINO, P. A.; SANTOS, A. L. F. dos; RIBEIRO, L. M.; COSTA, I. M. da; NARDI, J. W.; CECCON, G.
bitstream/item/148535/1/23-interceptacao.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Índice de área foliar; Interceptação luminosa; Densidade de plantas; Light interception.; Leaf area index; Plant density.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1054309

Effect of dates of planting, plant geometry and number of seedlings on growth and yield of hybrid rice (Oryza sativa L.)
Provedor de dados: 30
Autores: V.K.
Palavras-chave: Hybrids; Grain; Heterosis; Planting date; Dry matter; Spacing; Yields; Field experimentation; Plant population; Leaf area index.
Ano: 2008
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4676

Heliotropic responses of soybean cultivars at three phenological stages and under two water regimes
Provedor de dados: 86
Autores: Rakocevic,Miroslava; Neumaier,Norman; Oliveira,Gustavo Migliorini de; Nepomuceno,Alexandre Lima; Farias,José Renato Bouças.
The objectives of this work were to determine the heliotropic movements of the upper trifoliates for two soybean cultivars, BR 16 and Embrapa 48, during a daily cycle, in three phenological stages and two water regimes, and to estimate the impact of irrigation and daily leaflet movements on agronomic characteristics and grain yield. Heliotropic movements were studied in three phenological stages: V4-V6, V7-V10, and R5 in irrigated and non-irrigated plots. For each stage, the leaflet elevation and azimuth were measured hourly. Under a low (V4-V6 stage) and mid (V7-V10 stage) leaf area index (LAI) the diaheliotropism was slightly more frequent and intensive in non-irrigated than in irrigated plants, only at early morning and late afternoon hours. At R5 stage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Diaheliotropism; Irrigation; Leaf area index; Paraheliotropism.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000700005

Simulation of soybean growth and yield under northeastern Amazon climatic conditions
Provedor de dados: 86
Autores: Souza,Paulo Jorge de Oliveira Ponte de; Farias,José Renato Bouças; Abreu,José Paulo Mourão de Melo e; Ribeiro,Aristides; Rocha,Edson José Paulino da; Botelho,Marcel do Nascimento; Sousa,Adriano Marlisom Leão de.
The objective of this work was to parameterize, calibrate, and validate a new version of the soybean growth and yield model developed by Sinclair, under natural field conditions in northeastern Amazon. The meteorological data and the values of soybean growth and leaf area were obtained from an agrometeorological experiment carried out in Paragominas, PA, Brazil, from 2006 to 2009. The climatic conditions during the experiment were very distinct, with a slight reduction in rainfall in 2007, due to the El Niño phenomenon. There was a reduction in the leaf area index (LAI) and in biomass production during this year, which was reproduced by the model. The simulation of the LAI had root mean square error (RMSE) of 0.55 to 0.82 m² m-2, from 2006 to 2009. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Amazon region; Climate models; Leaf area index; Soybean crop expansion; Yield simulation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000600001

Solar radiation use efficiency by soybean under field conditions in the Amazon region
Provedor de dados: 86
Autores: Souza,Paulo Jorge de Oliveira Ponte de; Ribeiro,Aristides; Rocha,Edson José Paulino da; Farias,José Renato Bouça; Loureiro,Renata Silva; Bispo,Carlos Capela; Sampaio,Leila.
The objective of this work was to evaluate the efficiency of soybean (Glycine max) in intercepting and using solar radiation under natural field conditions, in the Amazon region, Brazil. The meteorological data and the values of soybean growth and leaf area were obtained from an agrometeorological experiment carried out in Paragominas, Pará state, during 2007 and 2008. The radiation use efficiency (RUE) was obtained from the ratio between the above-ground biomass production and the intercepted photosynthetically active radiation (PAR) accumulated to 99 and 95 days after sowing, in 2007 and 2008, respectively. Climatic conditions during the experiment were very distinct, with reduction in rainfall in 2007, which began during the soybean mid-cycle, due to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Amazon region; Leaf area index; Radiation interception.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009001000001

Tiller size/density compensation in grazed Tifton 85 bermudagrass swards
Provedor de dados: 86
Autores: Sbrissia,André Fischer; Silva,Sila Carneiro da; Matthew,Cory; Carvalho,Carlos Augusto Brandão de; Carnevalli,Roberta Aparecida; Pinto,Luiz Felipe de Moura; Fagundes,Jaílson Lara; Pedreira,Carlos Guilherme Silveira.
The objective of this study was to evaluate the occurrence of the tiller size/density compensation mechanism in Tifton 85 bermudagrass swards grazed by sheep under continuous stocking. Treatments corresponded to four sward steady state conditions (5, 10, 15, and 20 cm of sward surface height), maintained by sheep grazing. The experimental design was a complete randomized block with four replicates. Pasture responses evaluated include: tiller population density, tiller mass, leaf mass and leaf area per tiller, and herbage mass. Tiller volume, leaf area index, tiller leaf/stem ratio, and tiller leaf area/volume ratio were calculated and simple regression analyses between tiller population density and tiller mass were performed. Measurements were made in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon; Leaf area index; Mass; Density; Plant morphology.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003001200013

Impact of Nitrogen Levels on Associated Weeds, Fodder Ability and Grain Protein Content of Dual-Purpose Wheat
Provedor de dados: 87
Autores: NAVEED,K.; BALOCH,M.S.; QAYYUM,A.; MEHMOOD,A.; HUSSAIN,I.; ALI,N.
ABSTRACT: Studies were carried out to see the response of dual-purpose wheat to different nitrogen levels i.e. 0, 50, 100, 150 and 200 kg N ha-1 in cut (for forage and grain purpose) vs. uncut (for grain only) treatments at the Agriculture Research Institute, Dera Ismail Khan, Pakistan during the years 2009-10 and 2010-11. The results revealed that maximum number of days to heading (123.5 and 124.5), plant height (117.7 and 116.6 cm), grain protein content (11.59 and 12.47%), fresh forage yield (2,646 and 2,956 kg ha-1) and grain yield (4,631 and 4,489 kg ha-1) were recorded in plots that received either 150 or 200 kg ha-1 nitrogen respectively and vice-versa. The data indicated higher values for number of days to heading in cut (124.9) as compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop growth rate; Leaf area index; Nitrogen levels; Crop production.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100309

Biometric Responses of Soybean to Different Potassium Fertilization Management Practices in Years with High and Low Precipitation
Provedor de dados: 90
Autores: Esper Neto,Michel; Minato,Evandro Antonio; Besen,Marcos Renan; Inoue,Tadeu Takeyoshi; Batista,Marcelo Augusto.
ABSTRACT Brazilian soybean producers commonly apply maintenance potassium (K) fertilization during cultivation to restore the K taken up by plants; however, this measure can modify the morphophysiological plant characteristics, since the functions of K are closely related with plant growth and development. This study assessed the morphological changes in soybean plants in response to K rates, sowing fertilization, and the application periods of K fertilization in a Latossolo Vermelho eutroférrico (Oxisol) under a no-tillage system, located in the municipality of Floresta, Paraná. A randomized block design was used in the experiment with four replications in a fully crossed factorial design (5 × 2 × 2). The experiment was carried out in two growing seasons...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf area index; Correlation; Yield; Drought.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100525

Hemispherical photography to estimate biophysical variables of cotton
Provedor de dados: 91
Autores: Brandão,Ziany N.; Zonta,João H.
ABSTRACT The Leaf Area Index (LAI) is a key parameter to evaluate the vegetation spectral response, estimating plant nutrition and water requirements. However, in large fields is difficult to obtain accurate data to LAI determination. Therefore, the objective of this study was the estimation of LAI, biomass and yield of irrigated cotton through digital hemispherical photography. The treatments consisted of four nitrogen doses (0, 90, 180 and 270 kg ha-1) and four phosphorus doses (0, 120, 240 and 360 kg ha-1). Digital hemispherical photographs were collected under similar sky brightness conditions at 60 and 75 days after emergence (DAE), performed by the Digital Plant Canopy Imager - CI-110® of CID Inc. Biomass and LAI measurements were made on the same...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf area index; Cotton biomass; Plant Canopy Imager CI-110.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000900789

Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil
Provedor de dados: 91
Autores: Gondim,Patrícia S. de S.; Lima,José R. de S.; Antonino,Antonio C. D.; Hammecker,Claude; Silva,Renan A. B. da; Gomes,Clarissa A.
A micrometeorological experiment was conducted over grasslands in a semi-arid region of north-eastern Brazil (São João, Pernambuco) from January to December 2011, using the Bowen ratio energy balance method, to improve the current understanding of energy partitioning and water vapour exchange over this ecosystem in this region. The objectives of the present study were to quantify the seasonal and diurnal variations in energy and water vapour exchanges over grasslands and understand the biotic and abiotic factors controlling the energy partitioning of this ecosystem. In the dry period, the low stored soil water limited the grass production and leaf area index, and as a consequence of these conditions, most of the annual net radiation (58%) was consumed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evapotranspiration; Soil water content; Leaf area index.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100003

Structural characteristics and forage mass of Tifton 85 pastures managed under three post-grazing residual leaf areas
Provedor de dados: 96
Autores: Silva,Wilton Ladeira da; Galzerano,Leandro; Reis,Ricardo Andrade; Ruggieri,Ana Cláudia.
The experiment was carried out on Cynodon spp cv. Tifton 85 pastures grazed by sheep under rotational stocking, with the objective of evaluating the structural characteristics as well as the forage mass of the pastures subjected to three grazing intensities in successive cycles. Treatments were composed of three residual leaf area indices (rLAI; 2.4; 1.6 and 0.8), allocated in completely randomized blocks with seven replications, totaling 21 experimental units. Tiller population density, pasture height, leaf area index, forage morphological composition and pasture forage mass were evaluated. The rLAI modified the tiller population density, which increased linearly with decrease in the rLAI of the pastures. Dry masses of leaf blade, stem and dead material...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf area index; Light interception; Sheep; Rotational stocking; Tillers.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000400002

Forage mass and structure of piatã grass deferred at different heights and variable periods
Provedor de dados: 96
Autores: Vilela,Hélio Henrique; Sousa,Braulio Maia de Lana; Santos,Manoel Eduardo Rozalino; Santos,Andreza Luzia; Assis,Camila Zimmer de; Rocha,Gabriel de Oliveira; Faria,Bruno Damaceno; Nascimento Júnior,Domicio do.
The objective of this study was to determine the deferment period and the most adequate initial sward height of Brachiaria brizantha cv. Piatã for deferment in the region of Viçosa, Minas Gerais. For so, the following characteristics were evaluated: masses and bulk density of forage and its morphological components, light interception by the sward, leaf area index, leaf angle, sward and extended tiller height and falling index of the deferred piatã grass. The three deferment periods assessed (65, 85 and 105 days) were randomized to the plots and the three sward heights (20, 30 and 40 cm), randomized in the subplots. The experimental design was of completely randomized blocks, with three replicates, in a subdivided plots arrangement. Masses of forage, green...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Forage bulk density; Leaf area index; Light interception; Pasture management.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000700010

Evaluation of mathematical equations for estimating leaf area in rapeseed
Provedor de dados: 124
Autores: Dalmago,Genei Antonio; Bianchi,Cleusa Adriane Menegassi; Kovaleski,Samuel; Fochesatto,Elizandro.
ABSTRACT The aim of this study was to evaluate estimations of leaf area in rapeseed (Brassica napus L.) and the potential for application to different genotypes, environmental conditions and types of crop management. In experiments conducted during 2013, 2014, 2016 and 2017, three genotypes of rapeseed, five doses of nitrogen and three sowing dates were used. Leaves were randomly collected from different plants and positions on the plants. The leaf area (LA), and maximum width (W) and length (L) were determined for each leaf, and the product of L and W (LxW) was calculated. Fifty-six equations for estimating LA in rapeseed, where the independent variables were W, L or LxW, were compiled from the bibliography and evaluated in this work. The evaluation was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica napus; Colza; Modelling; Leaf area index.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000300420

Identification of cowpea genotypes for drought tolerance
Provedor de dados: 124
Autores: 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

Dynamic of dominance, growth and bromatology of Eragrostis plana Nees in secondary vegetation area
Provedor de dados: 124
Autores: Scheffer-Basso,Simone Meredith; Cecchin,Kalinca; Favaretto,Adriana.
ABSTRACT The objective of this work was to evaluate the dominance, growth and bromatology of tough lovegrass or 'annoni' grass (Eragrostis plana) in secondary vegetation area. The evaluations were carried out at 23, 45, 64, 86, 111, 132, 153, and 174 days of growth after a mowing. The tough lovegrass was the dominant species on the area, accounting for 76 to 90% of biomass. There was a linear increase for leaf (9.8 kg DM ha-1 day-1) and total dry mass (16.9 kg DM ha-1 day-1) of the tough lovegrass. During the 111 days of the vegetative stage, the biomass was composed only of leaves, and the flowering started at 132 days. At 174 days, the tough lovegrass accumulated about 4,000 kg DM ha-1, 650 kg DM ha-1 of which was composed of inflorescences. The growth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crude Protein; Dry matter; Fiber; Leaf area index; Leaf area ratio.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000300582

Orbital spectral variables, growth analysis and sugarcane yield
Provedor de dados: 63
Autores: Simões,Maurício dos Santos; Rocha,Jansle Vieira; Lamparelli,Rubens Augusto Camargo.
Temporal analysis of crop development in commercial fields requires tools for large area monitoring, such as remote sensing. This paper describes the temporal evolution of sugar cane biophysical parameters such as total biomass (BMT), yield (TSS), leaf area index (LAI), and number of plants per linear meter (NPM) correlated to Landsat data. During the 2000 and 2001 cropping seasons, a commercial sugarcane field in Araras, São Paulo state, Brazil, planted with the SP80-1842 sugarcane variety in the 4th and 5th cuts, was monitored using nine Landsat images. Spectral data were correlated with agronomic data, obtained simultaneously to the imagery acquisition. Two methodologies were used to collect spectral data from the images: four pixels (2 × 2) window and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Leaf area index; Crop development analysis; Spectral behavior.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400004

Combined effects of water status and iron deficiency chlorosis on grape composition in non-irrigated vineyards
Provedor de dados: 63
Autores: González,María-Rosa; Hailemichael,Girma; Catalina,Álvaro; Martín,Pedro.
ABSTRACT: Although water deficit and iron deficiency chlorosis are common environmental stresses in the Mediterranean area, few data are reported in the literature on their effects on vineyards, when acting simultaneously. The main objective of this research was to study the combined effects of iron deficiency and water status on vigor, yield and fruit composition in rainfed vineyards. Moreover, the investigation aimed to evaluate the feasibility of using foliar chlorophyll content (Chl) and predawn leaf water potential (LWP), measured at veraison, to assess potential quality of grapes in the framework of precision viticulture. For this, 24 non-irrigated ‘Tempranillo’ vineyard subzones were monitored in Ribera del Duero (North-Central Spain) during three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Chlorophyll; Drought; Leaf area index; Stress.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600473

Productive and vegetative behavior of olive cultivars in super high-density olive grove
Provedor de dados: 63
Autores: Proietti,Primo; Nasini,Luigi; Reale,Lara; Caruso,Tiziano; Ferranti,Francesco.
In recent years, there has been an increase in interest in super high-density (SHD) olive (Olea europaea L.) groves because they offer early entry into production, increased productivity and the possibility of using modified mechanical vine harvesters. This study was carried out in a young SHD olive grove to examine vegetative, histo-anatomical and productive characteristics and oil quality of the Spanish Arbequina and Italian Maurino and Leccino cultivars, characterized by low, low-to-medium and high vigor, respectively. Arbequina had low vigor and limited development in height and width, as well as a high leaf/wood ratio. Maurino had a canopy volume similar to that of Arbequina and, despite a great tendency to grow in height, had low vigor, a rather...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canopy architecture; Leaf anatomy; Leaf area index; Oil quality.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100020

Sward structural characteristics and herbage accumulation of Panicum maximum cv. Mombaça subjected to rotational stocking managements
Provedor de dados: 63
Autores: Silva,Sila Carneiro da; Bueno,Adriana Amaral de Oliveira; Carnevalli,Roberta Aparecida; Uebele,Marina Castro; Bueno,Fernando Oliveira; Hodgson,John; Matthew,Cory; Arnold,Greg C.; Morais,Jozivaldo Prudêncio Gomes de.
Grazing strategies promote changes in sward structure that can affect patterns of herbage accumulation and sward flexibility to management. This experiment evaluated sward structural characteristics and herbage accumulation of Mombaça guinea grass (Panicum maximum Jacq. cv. Mombaça) subjected to rotational stocking managements. Treatments involved grazing when swards reached either 95 or 100% interception of the incident light (LI), to post-grazing heights of 30 and 50 cm, and were allocated to 2,000 m² paddocks according to a randomised complete block design in a 2 × 2 factorial arrangement with four replications, from January 2001 to February 2002. Sward canopy changed from a vertical to a more horizontal orientation as the light interception area index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grazing management; Leaf canopy height; Leaf area index; Light interception.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100002

Growth indices ans productivity in sugarcane
Provedor de dados: 63
Autores: Simões,Maurício dos Santos; Rocha,Jansle Vieira; Lamparelli,Rubens Augusto Camargo.
A knowledge about the temporal development of agronomic variables in sugarcane is a very important aspect for the development of crop yield prediction models using remote sensing, and further studies are still needed. This paper describes the temporal evolution of sugarcane biophysical parameters, such as total biomass, leaf area index, number of plants per meter, and productivity. During two seasons, a commercial field in Araras/SP, planted with variety SP80-1842, on the 4th and 5th cuts, was monitored on eight different dates, and data were obtained for 2 m of sugarcane in three crop rows at 18 sampling points. Linear and multiple regression analyses were used to study growth analysis and to correlate agronomic variables (leaf area index and number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Leaf area index; Crop temporal evolution.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100005

การวิจัยค่าดัชนีพื้นที่ใบข้าวในข้าวพันธุ์ดีที่มีการใส่ปุ๋ยที่แตกต่างกัน ที่ศูนย์วิจัยข้าวคลองหลวง
Provedor de dados: 106
Autores: Khemporn Petcharaporn; Amorntat Inman.
In order to research on Leaf Area Index (LAI) in the recommended rice varieties with different rate of fertilizer application during 2014 at Khlong Luang Rice Research Center. An experiment as Split plot in RCB with 4 replications, main plot were 3 recommended rice varieties: RD49 RD31 and PTT1 and sub plot were fertilizer application rates : 0-0-0  12-6-6 and 30-6-6 N-P2O5-K2O kg per rai. Character measured was Leaf Area Index (LAI) in 3 recommended rice varieties at 30 50 70 90 days after planting. The result indicated that RD49 RD31 and PTT1 rice varieties Leaf Area Index maximum for 3 varieties was obtained at flowering stage (80 days after transplanting) and then it was reduced due to the wilting and falling of lower leaves. RD49 had the highest LAI...
Tipo: Collection
Palavras-chave: Leaf area index; Recommended rice varietries; Fertilizer rate; ดัชนีพื้นที่ใบ; ข้าวพันธุ์รับรอง; อัตราปุ๋ยเคมี.
Ano: 2015
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5913

Performance of the SunScan canopy analysis system in estimating leaf area index of maize
Provedor de dados: 111
Autores: Philip Gbenro Oguntunde; The Federal University of Technology, Akure; olawale J. Olukunle; The Federal University of Technology, Akure; Johnson T. Fasinmirin; The Federal University of Technology, Akure; Oluremi A. Abiolu; The Federal University of Technology, Akure.
Rapid and reliable estimates of leaf area index (LAI) are important for studies of exchanges of energy and gases in the biosphere-atmosphere continuum.  This paper evaluates the field performance of SunScan canopy analysis system for rapid estimation of LAI.  Direct and indirect measurements of LAI were made in a maize (Zea mays L.) field at four phenological stages (emergence, vegetative, flowering and physiological maturity) at a tropical site in Ghana during the Glowa Vota Project field campaign (www.glowa-volta.de).  Similar measurements were repeated in early and late planting seasons with similar crop management practices.  The result showed a generally good performance of this sensor at all the phenological stages.  Average LAI from the sensor...
Palavras-chave: Agricultural and Biosystems Engineering SunScan probe; Field evaluation; Leaf area index; Maize; Ghana.
Ano: 2012
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/1823

Commercial Digital Camera to Estimate Postharvest Leaf Area Index in Vitis vinifera L. cv. Cabernet Sauvignon on a Vertical Trellis
Provedor de dados: 117
Autores: Espinosa L.,Miguel; Acuña C.,Eduardo; Espinosa B.,Miguel; Barrera B.,Juan.
The leaf area index (LAI) of a vineyard (Vitis vinifera L.) cv. Cabernet Sauvignon located in the commune of Cauquenes, Maule Region in Chile, was estimated from digital images obtained with a commercial camera using two indirect methods: Leaf Area Gap and Brightness (LAGB) and -Photogrammetric Leaf Area Quantification System (PLAQS). The latter requires deleafing of the grapevine. In a normalized difference vegetation index (NDVI) map, three points of vine vigor were selected: high, medium, and low for which horizontal and vertical images were obtained. Images were filtered with the Arc View GIS 3.1 program to provide only leaf images and corresponding pixel numbers. Image area and square meters per linear meter were calculated. The best models were...
Tipo: Journal article
Palavras-chave: Vitis vinifera; Leaf area index; Digital image; Photographic camera.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200015

Growth and yield of rice cultivars sowed on different dates under tropical conditions
Provedor de dados: 118
Autores: Garcés-Varon,Gabriel; Restrepo-Díaz,Hermann.
Rice plants are susceptible to low light or high temperature conditions during the reproductive and maturity stages. Two rice cultivars, Fedearroz 50 ('F50') and Fedearroz 733 ('F733'), were planted on three planting dates, January 1st (PD1), February 15th (PD2) and April 1st (PD3), to expose them to different climatic conditions during the different stages of rice development. The experiment was a factorial arrangement. Of the various weather parameters, solar radiation fluctuated the most among the three different planting dates, with PD1 having the highest number of days with values &amp;#8805; 450 cal·cm-2·d-1. The yield components were influenced by the planting time. PD3 showed the lowest number of tillers per unit of area and the highest percentage...
Tipo: Journal article
Palavras-chave: Grain yield; Leaf area index; Planting date; Rice; Solar radiation; Tillers; Unfilled Spikelet percentage.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000200008