Estimativa de graus-dia em função de altitude e latitude para o estado de São Paulo

Júnior, Mário José Pedro; Brunini, Orivaldo; Alfonsi, Rogerio Remo; Angelocci, Luiz Roberto

doi:10.1590/s0006-87051977000100005

Cited by 11 publications

(6 citation statements)

References 3 publications

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“…Climatic data for the locations and periods that the fruits were produced were obtained from automatic weather stations installed close to the harvest areas. Daily data of temperature and 225 MATURATION OF Eugenia pyriformis SEEDS rainfall (mm) were collected between flowering and harvest and were used to calculate respectively: the growing degree-day (GDD, °C day), according to the equations proposed by Villa Nova et al (1972), considering 10°C as base temperature (Pedro Junior et al 1977); and accumulated rainfall (mm). Sequential water balance was also calculated with rainfall data using the model proposed by Thornthwaite and Mather (1955), in descending scale level with available water capacity (AWC) of 125 mm (Leivas et al 2006, Rolim et al 2007.…”

Section: Methodsmentioning

confidence: 99%

Maturation of Eugenia pyriformis seeds under different hydric and thermal conditions

Lamarca

Prataviera

Borges³

et al. 2013

An. Acad. Bras. Ciênc.

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This study aims to analyze the maturation and dispersal of Eugenia pyriformis Cambess. seeds produced in different years, and the influence of variation in thermal and hydric environment on seed physical and physiological characteristics at dispersal. Fruits at different developmental stages were harvested in the city of São Paulo between 2003 and 2010, as well as in the cities of Campinas and Lavras, in 2009 and 2010 and analyzed for size and color. The seeds were extracted from the fruits and their dry mass, water content, germination and vigor were assessed. Results showed that seed maturation is unsynchronized to the maturation of the fruit, taking 45 days on average (430 growing degree-days), longer in rainy times or lower temperatures. Seeds with higher physiological quality were produced in rainy years and when the temperature range was larger. We concluded therefore that hydric and thermal environmental variations during development influence the maturation of Eugenia pyriformis seeds and are able to determine the formation cycle and the final seed quality.

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Section: Methodsmentioning

confidence: 99%

Maturation of Eugenia pyriformis seeds under different hydric and thermal conditions

Lamarca

Prataviera

Borges³

et al. 2013

An. Acad. Bras. Ciênc.

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“…(*) = r significativo a 5% de probabilidade, ( NS ) = r não significativo. Table 2 Sensibilidade à dessecação de embriões de... (MARTINS et al, 2009;LAMARCA et al, 2013b), as características fotoblásticas e as exigências térmicas para a germinação (GUARDIA; LAMARCA, 2013) e os níveis de dormência e de tolerância à dessecação (DAWS et al, 2004(DAWS et al, , 2006PEREIRA et al, 2012).…”

Section: Discussionunclassified

“…O somatório de graus-dia (GD) foi realizado desde a floração até a colheita, segundo as equações propostas por Villa Nova et al (1972), considerando a temperatura base de 10 °C (PEDRO JUNIOR et al, 1977). Calculou-se, ainda, o balanço hídrico sequencial (mm), segundo o modelo proposto por Thornthwaite e Mather (1955), em nível de escala decendial, com capacidade de água disponível (CAD) de 125 mm (ROLIM et al, 2007).…”

Section: Methodsunclassified

“…Tais níveis podem, inclusive, ocorrer entre populações da mesma espécie e estar relacionados às características fenotípicas em respostas às condições ambientais (DAWS et al, 2004(DAWS et al, , 2006MARTINS et al, 2009;PEREIRA et al, 2012;LAMARCA et al, 2013b). Barbedo et al (2013) consideraram que as sementes sensíveis à dessecação podem ser, na verdade, sementes dispersas ainda imaturas.…”

Section: Introductionunclassified

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SENSIBILIDADE À DESSECAÇÃO DE EMBRIÕES DE Inga vera Willd. FORMADOS SOB DIFERENTES CONDIÇÕES AMBIENTAIS1

Lamarca

Barbedo

2015

Rev. Árvore

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RESUMO -Ingá, espécie nativa do Brasil utilizada na arborização urbana e em sistemas agroflorestais, tem sementes altamente sensíveis à dessecação. Essa sensibilidade pode ser condicionada pelas condições ambientais em que as sementes são formadas. Neste estudo, analisou-se o grau de sensibilidade à dessecação de embriões de ingá de origens distintas e formados sob diferentes condições ambientais. Os embriões foram obtidos de frutos maduros de matrizes em São Paulo e Minas Gerais e analisados quanto ao teor de água e conteúdo de massa de matéria seca no momento da dispersão e quanto ao grau de sensibilidade à dessecação. Os resultados confirmaram a hipótese de que a sensibilidade à dessecação não é totalmente predeterminada para as sementes de uma espécie e pode apresentar variações conforme a região de procedência. Verificou-se, ainda, que as condições do ambiente, principalmente temperatura do ar e disponibilidade hídrica, podem condicionar o ciclo de maturação, o grau de maturidade dos embriões após a dispersão dos frutos, a aquisição da tolerância à dessecação e a qualidade final dos embriões.Palavras-chave: Graus-dia; Sementes florestais; Sementes recalcitrantes. DESICCATION SENSITIVIY OF EMBRYOS OF Inga vera Willd. OBTAINE FROM DIFFERENT ENVIRONMENTAL CONDITIONSABSTRACT -"Ingá", a brazilian species commonly used in urban forestation and in agroforestry systems, produces seeds highly sensitive to desiccation. This sensitivity can be influenced by environmental conditions during seed formation. In this study we analyzed the degree of sensitivity to desiccation of ingá embryos obtained from different origins and environmental conditions. Embryos were obtained from mature fruits of trees in São Paulo and Minas Gerais and were analyzed for both water and dry matter content at shedding, as well as the degree of their sensitivity to desiccation. The results confirmed the hypothesis that the sensitivity to desiccation of seeds is not totally pre-established for the seeds of a species and may vary according to region in which they were obtained. It was also found that the conditions of the environment, especially air temperature and water availability can influence the maturation cycle, the degree of maturity of the embryos at shedding, the acquisition of desiccation tolerance and the final quality of the embryos.

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“…BURIOL & ESTEFANEL (1976) estimated the sum of monthly and annual GD at the state of Rio Grande do Sul as a function of the altitude, latitude, longitude, using T b of 0 ºC, 5 °C, 10 ºC, 15 ºC and 20 ºC, and obtained coefficients of determination ranging between 0.92 and 0.97, depending on the month and the T b applied. PEDRO JÚNIOR et al (1977) correlated GD with altitude and latitude by means of multiple linear regressions, and obtained coefficients of determination varying between 0.81 and 0.88, depending on the month analyzed. Despite the relevant contribution of these reports, GD modeling has been carried out considering the spatial and temporal variables separately, and using only monthly or annually scale.…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal modelling of the duration of the cotton cycle in the State Of Goiás, Brazil

et al. 2011

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The objective of this work was to develop and validate a mathematical model to estimate the duration of cotton (Gossypium hirsutum L. r. latifolium hutch) cycle in the State of Goiás, Brazil, by applying the method of growing degree-days (GD), and considering, simultaneously, its time-space variation. The model was developed as a linear combination of elevation, latitude, longitude, and Fourier series of time variation. The model parameters were adjusted by using multiple-linear regression to the observed GD accumulated with air temperature in the range of 15°C to 40°C. The minimum and maximum temperature records used to calculate the GD were obtained from 21 meteorological stations, considering data varying from 8 to 20 years of observation. The coefficient of determination, resulting from the comparison between the estimated and calculated GD along the year was 0.84. Model validation was done by comparing estimated and measured crop cycle in the period from cotton germination to the stage when 90 percent of bolls were opened in commercial crop fields. Comparative results showed that the model performed very well, as indicated by the Pearson correlation coefficient of 0.90 and Willmott agreement index of 0.94, resulting in a performance index of 0.85.

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Estimativa de graus-dia em função de altitude e latitude para o estado de São Paulo

Cited by 11 publications

References 3 publications

Maturation of Eugenia pyriformis seeds under different hydric and thermal conditions

Maturation of Eugenia pyriformis seeds under different hydric and thermal conditions

SENSIBILIDADE À DESSECAÇÃO DE EMBRIÕES DE Inga vera Willd. FORMADOS SOB DIFERENTES CONDIÇÕES AMBIENTAIS1

Spatio-temporal modelling of the duration of the cotton cycle in the State Of Goiás, Brazil

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