Abstract:Resumo -O objetivo deste trabalho foi avaliar e comparar os modelos do Filocrono e de Wang e Engel para estimativa do aparecimento de folhas em mudas de Eucalyptus grandis e E. saligna. Foram instalados dois experimentos em Santa Maria em 2005 e 2006, um, em campo, com nove épocas de semeadura, e o outro, em casa, de vegetação com duas épocas de semeadura. Os modelos usados foram o do Filocrono, que assume uma relação linear entre taxa de aparecimento de folhas e temperatura, e o de Wang e Engel, que assume um… Show more
“…The results were different from the observations for E. saligna and E. grandis, since for these species the best NL estimates given by WE method with nonlinear responses of LAR as a temperature function [14]. In general, the Phyllochron method criticized by considering the leaf emission response linear to temperature, what not accepted from the biological viewpoint.…”
Section: Resultsmentioning
confidence: 57%
“…where: T opt : optimum temperature for each species (˚C); The α coefficient was obtained based on niperiam logarithm (ln) by Equation (6) [14]:…”
Section: Methodsmentioning
confidence: 99%
“…The information is vital for the appropriate implementation of management for forest species, as well to improve the quality of produced seedlings, increasing the probability of successful implementation in plantations, whether for production or recovery [14]. In this context, considering the lack of information about the ecophysiological aspects of tropical forest seedlings, this study aimed to determine the thermal requirements of the following species: Adenanthera pavonina (L.), Cassia fistula (L.), Hymenolobium petraeum (Ducke) and Parkia pendula (Willd.…”
This study determined the thermal requirements of forest native seedlings (Hymenolobium petraeum and Parkia pendula) and exotic seedlings (Adenanthera pavonina and Cassia fistula) all belonging to Fabaceae family, in three shading conditions (full sun, 50% and 65% of global radiation attenuation by poliefinas black screens). Also they were estimated of leaf emergence by Phyllochron and the Wang and Engel models, on climatological conditions at Sinop (Region of Transition Amazon-Cerrado), Mato Grosso State, Brazil, for winter period (between June and August of 2012). The minimum (Tb) and maximum (T B ) basal temperatures and the optimum temperature (T opt ) of growth of each species were estimated by regressions between relative growth rates and minimum, maximum and average temperatures, respectively. The values of the estimated T b were 15.0˚C, 16.4˚C, 14.5˚C and 14.6˚C; to T B were 39.7˚C, 37.1˚C, 38.6˚C and 40.1˚C; and to T opt were 24.4˚C, 24.9˚C, 24.9˚C and 25.1˚C to A. pavonina, C. fistula, H. petraeum and P. pendula, respectively. The Phyllochron model showed highest efficiency in the estimation of leaf appearance when compared to Wang and Engel method.
“…The results were different from the observations for E. saligna and E. grandis, since for these species the best NL estimates given by WE method with nonlinear responses of LAR as a temperature function [14]. In general, the Phyllochron method criticized by considering the leaf emission response linear to temperature, what not accepted from the biological viewpoint.…”
Section: Resultsmentioning
confidence: 57%
“…where: T opt : optimum temperature for each species (˚C); The α coefficient was obtained based on niperiam logarithm (ln) by Equation (6) [14]:…”
Section: Methodsmentioning
confidence: 99%
“…The information is vital for the appropriate implementation of management for forest species, as well to improve the quality of produced seedlings, increasing the probability of successful implementation in plantations, whether for production or recovery [14]. In this context, considering the lack of information about the ecophysiological aspects of tropical forest seedlings, this study aimed to determine the thermal requirements of the following species: Adenanthera pavonina (L.), Cassia fistula (L.), Hymenolobium petraeum (Ducke) and Parkia pendula (Willd.…”
This study determined the thermal requirements of forest native seedlings (Hymenolobium petraeum and Parkia pendula) and exotic seedlings (Adenanthera pavonina and Cassia fistula) all belonging to Fabaceae family, in three shading conditions (full sun, 50% and 65% of global radiation attenuation by poliefinas black screens). Also they were estimated of leaf emergence by Phyllochron and the Wang and Engel models, on climatological conditions at Sinop (Region of Transition Amazon-Cerrado), Mato Grosso State, Brazil, for winter period (between June and August of 2012). The minimum (Tb) and maximum (T B ) basal temperatures and the optimum temperature (T opt ) of growth of each species were estimated by regressions between relative growth rates and minimum, maximum and average temperatures, respectively. The values of the estimated T b were 15.0˚C, 16.4˚C, 14.5˚C and 14.6˚C; to T B were 39.7˚C, 37.1˚C, 38.6˚C and 40.1˚C; and to T opt were 24.4˚C, 24.9˚C, 24.9˚C and 25.1˚C to A. pavonina, C. fistula, H. petraeum and P. pendula, respectively. The Phyllochron model showed highest efficiency in the estimation of leaf appearance when compared to Wang and Engel method.
“…Por exemplo, Martins et al (2012) obtiveram valores de Tb de 10,5 e 11ºC para as cultivares de oliveira Arbequina e MGS ASC315 utilizando uma metodologia distinta das utilizadas neste estudo, e Alcalá e Barranco (1992) entre 10 e 13ºC, para o florescimento de diferentes cultivares de oliveira na Espanha. Outros autores como Melo-Abreu et al (2004) encontraram Tb de 8,5 e 8,8ºC para o processo de quebra de dormência; e Ayerza e Sibbett (2001) encontraram valores entre 0 e 4,5 ºC para o processo de vernalização em várias cultivares de oliveira no Texas, e em alguns lugares da Argentina, Espanha, Itália, Peru e México. Informações básicas sobre o desenvolvimento vegetativo, como a estimativa da Tb, em cultivares de oliveira são importantes para conhecer as cultivares mais adaptadas às condições climáticas de cultivo, e as necessidades da cultura em condições meteorológicas distintas do seu centro de origem .…”
A temperatura basal inferior (Tb) é uma variável de entrada muito utilizada em modelos que quantificam o desenvolvimento de culturas agrícolas e florestais. O objetivo deste trabalho foi estimar a Tb para o desenvolvimento vegetativo na fase de muda, para duas cultivares de oliveira, Grappolo e Maria da Fé, em condições de campo. O estudo foi desenvolvido na área Experimental da Empresa de Pesquisa Agropecuária de Minas Gerais, em Maria da Fé, MG, Brasil, conduzido sob o delineamento inteiramente casualizado, sendo duas cultivares de oliveira, três épocas de transplantio, e quinze repetições. A Tb foi estimada através de seis métodos, cujos valores obtidos variaram em função do método de cálculo utilizado. A Tb estimada foi de 9,6 ºC para a Grappolo e 6,9 ºC para a Maria da Fé. Palavras-chave: Desenvolvimento, Temperatura do ar, Fenologia, Olea europaea L.
ABSTRACT: ESTIMATE OF THE BASE TEMPERATURE IN TWO OLIVE CULTIVARS:GRAPPOLO AND MARIA DA FÉ The base temperature (Tb) is an input variable widely used in models of agricultural and forest crops development. The aim of this study was to estimate the Tb for vegetative development, represented by seedling phase in two olive cultivars under field conditions. The experiment was carried out in the experimental area of the Agricultural Research Corporation of Minas Gerais, in Maria da Fé, Minas Gerais, Brazil. The experimental design was completely randomized with two olive cultivars, three transplanting dates and fifteen repetitions. The Tb was estimated by six methods described in literature, whose values varied depending on each method of calculation. The estimated Tb was 9.6 ºC for Grappolo and 6.9 ºC to Maria da Fé, respectively.
“…For potato, the linear error was 3.7 leaves and the WE error was 2.0 leaves . For eucalyptus trees, the RMSE ranged from 7.1 to 10.0 leaves for linear and from 2.7 to 3.7 leaves for the WE (MARTINS & STRECK, 2007). For two olive trees cultivars, the WE presented an error of 3.41 leaves while the linear showed an error of 7.5 leaves (MARTINS et al, 2014).…”
The objective of this study was to compare the simulations of leaf appearance of landrace and improved maize cultivars using the CSM-CERES-Maize (linear) and the Wang and Engel models (nonlinear). The coefficients of the models were calibrated using a data set of total leaf number collected in the 11/04/2013 sowing date for the landrace varieties ‘Cinquentinha’ and ‘Bico de Ouro’ and the simple hybrid ‘AS 1573PRO’. For the ‘BRS Planalto’ variety, model coefficients were estimated with data from 12/13/2014 sowing date. Evaluation of the models was with independent data sets collected during the growing seasons of 2013/2014 (Experiment 1) and 2014/2015 (Experiment 2) in Santa Maria, RS, Brazil. Total number of leaves for both landrace and improved maize varieties was better estimated with the Wang and Engel model, with a root mean square error of 1.0 leaf, while estimations with the CSM-CERES-Maize model had a root mean square error of 1.5 leaf.
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