João Everthon da Silva Ribeiro

Universidade Federal Rural do Semi-Árido

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Reinaldo Farias Paiva de Lucena

Universidade Federal de Mato Grosso do Sul

Denise Dias da Cruz

Universidade Federal da Paraíba

Ernane Nogueira Nunes

Instituto Nacional do Semiárido

Ramon Santos Souza

Universidade Federal da Paraíba

Ester dos Santos Coêlho

Universidade Federal Rural do Semi-Árido

Jackson Silva Nóbrega

Universidade Federal de Campina Grande

Rubens Teixeira de Queiroz

Universidade Federal da Paraíba

Manoel Bandeira de Albuquerque

Universidade Federal da Paraíba

Thiago Jardelino Dias

Universidade Federal da Paraíba

Francisco Romário Andrade Figueiredo

Universidade Federal Rural do Semi-Árido

Cooperative Institutions

Universidade Federal da Paraíba

133

Universidade Federal Rural do Semi-Árido

Universidade Federal de Campina Grande

Universidade Federal de Viçosa

Universidade Federal Rural de Pernambuco

Universidade Estadual da Paraíba

Universidade Federal do Ceará

Brazilian Agricultural Research Corporation

Universidade Federal de Pernambuco

University of Lisbon

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Development, Physiology and Productivity of the Common Bean Under Different Nitrogen Doses

Journal of Agricultural Science (2018)

João Everthon da Silva Ribeiro Arliston Pereira Leite José Eldo Costa Manoel Bandeira de Albuquerque Fábio Mielezrski

Among nutrients, nitrogen is required in the greatest quantities by bean culture. The objective of this work was to evaluate growth, physiological responses and productivity of the common bean cultivar, ‘IAC Imperador’ under varying nitrogen doses in Brejo Paraibano. The experiment was carried out at Fazenda Experimental Chã-de-Jardim (Chã-de-Jardim Experimental Farm), of the Centro de Ciências Agrárias of the Universidade Federal da Paraíba, in the municipality of Areia, state of Paraíba. The treatments comprised 0, 50, 100, 150 and 200 kg of nitrogen ha-1, applied in coverage at 35 days after sowing. To assess growth, plant height, stem diameter and number of leaves were evaluated. For gas exchange, photosynthesis rate, internal CO2 concentration, transpiration, stomatal conductance, instantaneous water use efficiency and instantaneous carboxylation efficiency were evaluated. For chlorophyll “a” fluorescence, minimum leaf fluorescence, maximum leaf fluorescence, variable maximum fluorescence, potential quantum efficiency of PSII (Photosystem II) and ratio (Fv/F0) were evaluated. For the components of primary productivity, the height of insertion of the first pod, number of pods per plant and the number of grains per pod were evaluated. Nitrogen fertilization in coverage significantly affected most of the growth, gas exchange and productivity variables, with the dose of 200 kg ha-1 being responsible for the highest values (p < 0.05). Chlorophyll fluorescence showed no significant differences among the nitrogen doses. The nitrogen doses influenced the growth, gas exchange and productivity of the common bean in the region of Brejo Paraibano.

Stomatal Conductance

10.5539/jas.v10n6p171

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Physicochemical quality and bioactive compounds in orange-fleshed sweet potato

Revista Caatinga (2024)

José Travassos dos Santos Júnior Pablo Henrique de Almeida Oliveira Flávio Pereira da Mota Silveira Gisele Lopes dos Santos João Everthon da Silva Ribeiro

ABSTRACT Sweet potato is a vital food root, rich in vitamins, minerals, and bioactive compounds. Genotypes that meet these nutritional demands are essential to combat nutrient deficiencies and promote human health. Thus, it presupposes the hypothesis that sweet potato genotypes differ in physicochemical quality and bioactive compounds when evaluated under the same environmental conditions. Thus, this study aims to evaluate the physicochemical quality and bioactive compounds in genotypes of orange-fleshed sweet potato. The experiment was conducted from April 2022 to August 2022 in the experimental area of Agronomic Engineering, located at the Academic Unit Specialized in Agricultural Sciences (UAECA) - UFRN, in Macaíba, RN, Brazil. The treatments were composed of eight genotypes, being two cultivars (BRS Amélia and Beauregard) and six accessions (Macaíba I, Macaíba II, Macaíba III, Macaíba IV, Ceará-Mirim, and Natal I) of orange-fleshed sweet potato from the UAECA teaching collection. After harvest, the following characteristics were evaluated: firmness, elasticity, hydrogen potential (pH), titratable acidity (TA), soluble solids (SS), ratio (SS/TA), Vitamin C, and the bioactive compounds: anthocyanins, flavonoids, and total carotenoids. The orange-fleshed sweet potato genotypes showed distinct characteristics for the physicochemical variables and the bioactive compounds. Due to increased pulp pH, anthocyanins were reduced in the Ceará-Mirim, Macaíba III, and Macaíba IV genotypes. The Macaíba II and Natal I genotypes stood out regarding the SS/TA ratio, flavonoids, and anthocyanins. In contrast, the Macaíba III genotype had the highest carotenoid content and great bioactive potential.

10.1590/1983-21252025v3812724rc

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Leaf Area Estimate of Erythroxylum simonis Plowman by Linear Dimensions

Figshare (2018)

João Everthon da Silva Ribeiro Ana Jéssica Soares Barbosa Manoel Bandeira de Albuquerque

ABSTRACT This research aimed to determine an equation to estimate the leaf area of Erythroxylum simonis using the length and width of leaf blades. Two hundred leaf blades of this species were collected in Mata do Pau-Ferro, a State Park located in Areia, PB, Brazil. Regression analyses were used to determine the estimation equations. The linear, linear without intercept, quadratic, cubic, power and exponential statistical models were used. The criteria used for model selection were based on an examination of the coefficient of determination, the Akaike information criterion and standard error of the estimate. All the equations presented can be used to estimate the leaf area of E. simonis. From a practical point of view, the linear regression equation without intercept involving the product between length and width is recommended, using the equation Y=0.6426*LW, which corresponds to 64.26% of the product between length and width, with a coefficient of determination of 0.9936.

10.6084/m9.figshare.7512401

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Croton sincorensis Mart. Euphsorbiaceae

Ethnobotany of mountain regions (2023)

João Everthon da Silva Ribeiro Ernane Nogueira Nunes Ramon Santos Souza Denise Dias da Cruz Reinaldo Farias Paiva de Lucena

Croton

10.1007/978-3-030-87251-9_34

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Piptadenia retusa (Jacq.) P.G. Ribeiro, Seigler & Ebinger Fabaceae

Ethnobotany of mountain regions (2023)

Ernane Nogueira Nunes João Everthon da Silva Ribeiro Ramon Santos Souza Rubens Teixeira de Queiroz Denise Dias da Cruz

10.1007/978-3-030-87251-9_81

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Nondestructive method for estimating the leaf area of sapodilla from linear leaf dimensions

Revista Brasileira de Engenharia Agrícola e Ambiental (2022)

João Everthon da Silva Ribeiro Ester dos Santos Coêlho Ângela Maria dos Santos Pessoa Anna Kézia Soares de Oliveira Ágda Malany Forte de Oliveira

ABSTRACT The leaf area is a parameter of fundamental importance in studies on plant growth and physiology. The objective of this study was to build allometric equations for the accurate and fast estimation of sapodilla leaf areas. In total, 250 leaves of different shapes and sizes were collected from sapodilla matrices trees growing at the Universidade Federal Rural do Semi-Árido, Mossoró-RN, Brazil. For each leaf, the length, width, product of length and width (LW), product of length and length, product of width and width, and leaf area were measured. Linear and nonlinear models were used to construct the allometric equations. The best equations were chosen on the basis of the following criteria: the highest coefficient of determination, Pearson’s linear correlation coefficient, and Willmott’s index of agreement; and the lowest Akaike information criterion and root mean square error. It was verified that the models that used the LW value presented the best criteria for estimating the leaf area. Specifically, the equations ŷ = 0.664 × LW1.018 and ŷ = 0.713 × LW, which use LW values, are the most suitable for estimating the leaf area of sapodilla quickly and accurately.

Akaike information criterion

Allometry

Tree Allometry

10.1590/1807-1929/agriambi.v27n3p209-215

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Sapium glandulosum (L.) Morong Sapindaceae

Ethnobotany of mountain regions (2022)

João Everthon da Silva Ribeiro Ernane Nogueira Nunes Ramon Santos Sousa Rubens Teixeira de Queiroz Denise Dias da Cruz

10.1007/978-3-030-47254-2_88-1

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fib Bulletins 102. Guide for Protection and Repair of Concrete Structures

Bulletin - FIB (2022)

Eduardo Cavaco Carmen Andrade Júlio Appleton Véronique Bouteiller Susana Cabral Fonseca

Guide for Protection and Repair of Concrete Structures (PDF) fib Bulletins No. 102. Guide for Protection and Repair of Concrete Structures. Guide for good practice (291 pages, ISBN 978-2-88394-156-4, March 2022)

10.35789/fib.bull.0102

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Seasonal variation in gas exchange by plants of Erythroxylum simonis Plowman

Acta Botanica Brasilica (2018)

João Everthon da Silva Ribeiro Ana Jéssica Soares Barbosa Sérgio de Faria Lopes Walter Esfrain Pereira Manoel Bandeira de Albuquerque

Erythroxylum simonisis an understory species found in Northeast Brazil. Due to its shaded habitat,E. simonisis subjected to seasonal oscillations of the environment, to which it must respond ecophysiologically. The objective of this study was to evaluate the effects of seasonality on the ecophysiology ofE. simonis in a fragment of Seasonal Semideciduous Forest. Leaf area index, visible sky fraction and photosynthetically active radiation were measured for 10 individuals during the dry and rainy seasons. Soil moisture, temperature and monthly precipitation were measured, as well as photosynthetic rate, stomatal conductance, internal CO2concentration, transpiration, instantaneous water use efficiency, instantaneous carboxylation efficiency and chlorophyll content. Ecophysiological variables were correlated with environmental variables, with a greater association of rainfall and soil moisture with stomatal conductance, transpiration and photosynthetic rate, indicating that water availability has an effect on the ecophysiology ofE. simonis. With the exception of instantaneous carboxylation efficiency, gas exchange exhibited significant differences among the months studied, with the highest values being for months with greater water availability, thus showing that the ecophysiology of the species responds to seasonal changes throughout the year.

Ecophysiology

Stomatal Conductance

Photosynthetically active radiation

Seasonality

Understory

10.1590/0102-33062017abb0240

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Produtividade de genótipos de cana de açúcar em resposta à aplicação de calcário em microclima do semiárido brasileiro

Research Society and Development (2021)

Marianne Costa de Azevedo Edson de Souza Silva L. J. M. Almeida Bruno Henrique Braz Rosendo João Everthon da Silva Ribeiro

Para que o canavial produza satisfatoriamente é necessário que se cultive genótipos de cana de açúcar que seja adaptados as condições edafoclimaticas da região, além disso, também é necessário fazer a correção do solo para que a planta consiga extrair todos os nutrientes necessários ao seu desenvolvimento. Objetivou-se avaliar a produtividade de genótipos de cana de açúcar cultivados com e sem calagem durante os ciclos cana-planta e cana-soca. O delineamento experimental utilizado foi em DBC, com 4 repetições, em esquema fatorial 10 x 2, sendo 10 genótipos de cana de açúcar e dois manejos de calcário (com e sem aplicação). A quantidade de calcário aplicado foi calculada com base na fórmula de elevação de saturação por bases com o resultado da análise de solo, utilizando-se 4,5 t ha-1 de calcário incorporado ao solo na cana planta e 2,8 t ha-1 em superfície na cana soca. Foi avaliado altura de plantas, diâmetro médio do colmo, número de colmos por metro, número de entrenós, ºBrix, produtividade. Os dados foram submetidos à análise de variância e as médias comparadas entre si pelo teste de Scott-Knott. Os resultados mostram que na cana planta o calcário promoveu o incremento na altura de plantas, diâmetro de colmo, colmos por metro, e produtividade. Na cana soca o calcário influenciou positivamente o número de colmos por metro, e produtividade, sendo o °Brix a única variável afetada negativamente. Os genótipos que melhor responderam a calagem foram RB93509, RB002754, RB962962, RB992506 e SP79-1011.

10.33448/rsd-v10i7.16784

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