Salassier Bernardo

Universidade Estadual do Norte Fluminense, Rio de Janeiro, Rio de Janeiro, Brazil

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Publications (33)13.25 Total impact

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    ABSTRACT: In this work, different methods of determination of pan coefficient (Kp) for a daily estimation of referential evapotranspiration (ETo) using the "Class A" pan method (TCA) were analyzed. Methodologies proposed by Allen et al. (1998), Bernardo et al. (1996), Cuenca (1989) and Snyder (1992) were evaluated, and values of daily ETo estimated using TCA were compared to ones estimated by Penman-Monteith (FAO-56). A ten years historical series of data collected from an automatic station, Thies Clima model, was used installed at evapotranspiration station of Universidade Estadual do Norte Fluminense (UENF). A good fulfillment of Class A pan to estimate daily values of ETo by different ways to calculate Kp (R² > 0.79 and D > 0.90) was verified, with Cuenca (1989), Bernardo et al. (1996), and Allen (1998) methods showing the same concordance index (D = 0.95). The smallest absolute mean error (0.50) was showed by Cuenca (1989) method, which also presented the highest efficiency (EF = 0,81).
    Revista Brasileira de Engenharia Agrícola e Ambiental 03/2010; 14(3):274-278. DOI:10.1590/S1415-43662010000300006 · 0.66 Impact Factor
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    ABSTRACT: The objective of this study was to determine the response coefficient to water stress in the commercial and total yield of papaya fruits grown in the northern region of the State of Rio de Janeiro. The experiment was conducted in an area of UENF/PESAGRO-RIO in the municipality of Campos dos Goytacazes, Rio de Janeiro, from 25/04/2006 to 18/05/2007, using the papaya cultivar Hybrid UENF/CALIMAN01. The experiment had a randomized block design with five treatments [replacement of reference evapotranspiration (ETo) by 50% (T1), 75% (T2), 100% (T3), 125% (T4) and 150% (T5)], with four replications. The highest real commercial yield of the crop after 13 months of growth and four harvest months was 38.78 t ha-1 (T3) and the highest total real yield was 49.42 t ha-1 (T5). After 13 months of growth and 4 harvest months of the papaya cultivar Hybrid UENF/CALIMAN01 the response coefficient for commercial fruit yield (ky) was 1.4581 and 0.5674 for total yield.
    Revista Brasileira de Engenharia Agrícola e Ambiental 04/2009; 13(2):158-164. · 0.66 Impact Factor
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    ABSTRACT: RESUMO Teve-se como objetivo neste trabalho, determinar o coeficiente de resposta ao déficit hídrico na produção de frutos co-merciais e totais do mamoeiro, cultivado na região Norte do Estado do Rio de Janeiro. O experimento foi realizado na área de convênio UENF/PESAGRO-RIO, no município de Campos dos Goytacazes, RJ, no período de 25/04/2006 a 18/05/2007, utilizando-se o mamoeiro cultivar Híbrido UENF/CALIMAN01 e um delineamento em blocos casualizados, com cinco tratamentos, correspondendo às reposições de 50% (T1), 75% (T2), 100% (T3), 125% (T4) e 150% (T5) da evapotranspiração de referência (ETo), com quatro repetições. A máxima produção comercial real da cultura, aos 13 meses de cultivo e com quatro meses de colheita, foi de 38,78 t ha -1 (T3) e a máxima produção total real encontrada foi de 49,42 t ha -1 (T5). O mamoeiro cultivar Híbrido UENF/CALIMAN01 conduzido até os 13 meses de cultivo e com qua-tro meses de colheita, apresentou um coeficiente de resposta de produção (ky) para frutos comerciais de 1,4581 e para produção total um coeficiente igual a 0,5674. Palavras-chave: Carica papaya L., coeficientes de sensibilidade, deficiência hídrica Response coefficient of papaya yield to water stress (ky) in Northern Rio de Janeiro ABSTRACT The objective of this study was to determine the response coefficient to water stress in the commercial and total yield of papaya fruits grown in the northern region of the State of Rio de Janeiro. The experiment was conducted in an area of UENF/PESAGRO-RIO in the municipality of Campos dos Goytacazes, Rio de Janeiro, from 25/04/2006 to 18/05/2007, using the papaya cultivar Hybrid UENF/CALIMAN01. The experiment had a randomized block design with five treatments [replacement of reference evapotranspiration (ETo) by 50% (T1), 75% (T2), 100% (T3), 125% (T4) and 150% (T5)], with four replications. The highest real commercial yield of the crop after 13 months of growth and four harvest months was 38.78 t ha -1 (T3) and the highest total real yield was 49.42 t ha -1 (T5). After 13 months of growth and 4 harvest months of the papaya cultivar Hybrid UENF/CALIMAN01 the response coefficient for commercial fruit yield (ky) was 1.4581 and 0.5674 for total yield.
    Revista Brasileira de Engenharia Agrícola e Ambiental 01/2009; 13(2). DOI:10.1590/S1415-43662009000200008 · 0.66 Impact Factor
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    ABSTRACT: Leaf area estimation is an important feature in physiological research involving predominantly photosynthesis, transpiration and growth. This study was carried out to develop a practical and nondestructive empirical mathematical model to estimate the area of one leaf and the total leaf area for papaya trees (Carica papaya L.). Two irrigated commercial orchards were evaluated over a period of 50 to 550 days after transplanting, during which the length of the leaf midrib (LM) varied from 0.04 to 0.60 m. A mathematical model was developed to estimate the area of one leaf for the papaya tree, taking into account LM and the age of the plant measured in days after transplanting. The model was considered satisfactory. Based on the average length of the last two leaves of the crown and the total leaf number of the plant, it was possible to satisfactorily estimate the total leaf area of the papaya tree.
    Scientia Agricola 01/2009; 66(4). DOI:10.1590/S0103-90162009000400005 · 0.92 Impact Factor
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    ABSTRACT: This study aimed to determine the crop evapotranspiration (ETc) and the crop coefficient (Kc) for of UENF/CALIMAN01 papaya hybrid (Carica papaya L.). The experiment was conducted in an area of UENF/PESAGRO-RIO, in Campos dos Goytacazes, RJ, Brazil, from 4-25-2006 to 8-20-2007. To determine the ETc and Kc, a weighing lysimeter (6 m2) was used. The reference evapotranspiration (ETo) was determined by the Penmam-Monteith (FAO) method. The maximum crop evapotranspiration was of 2.9 mm day-1, 229 days after the transplant (DAT), and the medium crop evapotranspiration during the experiment was of 1.8 mm day-1. The value of crop coefficient (Kc) varied linearly from 0.63 to 1.05, the transplant to 206 DAT. After this period, the variation of Kc presented inversely relation with the canopy diameter, being reduced to a value medium minimum of 0.81, to 300 DAT. Considering the whole period of study, it was obtained an average Kc of 0.87.
    Engenharia Agrícola 12/2008; 28(4):681-690. · 0.41 Impact Factor
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    ABSTRACT: This work aimed to study the effects of different irrigation depths and potassium doses on yield and fruit quality of papaya cv Golden. The experiment was carried out in an area of commercial and agricultural production situated in Linhares - ES, Brazil. The design employed was randomized blocks, arranged in subdivided parcels and having three replications. The treatments consisted of five irrigation depths in the parcel and four potassium doses in the subparcel, totalizing 20 treatments. The five programmed irrigation depths were 50; 70; 90; 110 and 130% of the reference evapotranspiration and the four potassium doses were 30; 42; 54 and 66 g of K2O plant-1month-1. The high rainfall rates in the experimental period (February-2005 to June-2006), greatly overcame the plant water requirements, interfering in the treatments, not allowing significant variation in the variables analyzed, particularly in function of the applied depths. During the 11 months and 21 days of harvest, the average yield was 79.41 t ha-1, with an average of 96 fruits per plant which, in the first stage of ripening, presented a mass of 404 g, average total soluble solids content (SST) of 10.11 ºBrix and pulp and fruit firmness of 79.80 N and 126.19 N, respectively.
    Engenharia Agrícola 09/2008; 28(3):417-426. DOI:10.1590/S0100-69162008000300003 · 0.41 Impact Factor
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    ABSTRACT: This work was performed with the aim of proposing an artificial neural network (ANN) to estimate the reference evapotranspiration (ETo) as a function of geographic position coordinates and air temperature in the State of Rio de Janeiro. Data used for the network training were collected from 17 historical time series of climatic elements located in the State of Rio de Janeiro. The daily ETo calculated by Penman-Monteith (FAO-56) method was used as a reference for network training. ANNs of multilayer perceptron type were trained to estimate ETo as a function of latitude, longitude, altitude, mean air temperature, thermal daily amplitude and day of the year. After training with different network configurations, the one showing best performance was selected, and was composed by only one intermediary layer (with twenty neurons and sigmoid logistic activation function) and one output layer (with one neuron and linear activation function). According to the results obtained it can be concluded that, considering only geographical positioning coordinates and air temperature, it is possible to estimate daily ETo in 17 places of Rio de Janeiro State by using an ANN.
    Revista Brasileira de Engenharia Agrícola e Ambiental 04/2008; 12(2):174-180. DOI:10.1590/S1415-43662008000200010 · 0.66 Impact Factor
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    ABSTRACT: This paper aimed in identifying great levels of irrigation and nitrogen fertilization that provide the greatest physical and economical productivity of papaya tree Golden cultivar. In the identification of the great levels it was used production function. The experimental study was conducted at Caliman S.A. farm, in the city of Linhares, State of Espírito Santo, Brazil. The experimental design was randomized blocks in a 5x4 factorial scheme in split-plot. Five irrigation water depths (0.5; 0.7; 0.9; 1.1 e 1.3 of the evapotranspiration of reference) were used with daily irrigation frequency and four rates of ammonium sulphate (90, 188, 288 e 377 kg ha-1 month-1). The productivity estimation (t ha-1) as a function of the applied total water depth obtained a significant statistical adjustment (p < 0.05) from the model of second order. The great economical productivity was 94.83 t ha-1, with the maximum depth of 1546.50 mm. Operational net incomes for domestic and international markets were R$ 313.19 e R$ 929.57 ha-1 month-1, respectively.
    Revista Brasileira de Fruticultura 01/2008; 30(2). DOI:10.1590/S0100-29452008000200021 · 0.49 Impact Factor
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    ABSTRACT: This study aimed to determine the crop evapotranspiration (ETc) and the crop coefficient (Kc) for of UENF/CALIMAN01 papaya hybrid (Carica papaya L.). The experiment was conducted in an area of UENF/PESAGRO-RIO, in Campos dos Goytacazes, RJ, Brazil, from 4-25-2006 to 8-20-2007. To determine the ETc and Kc, a weighing lysimeter (6 m2) was used. The reference evapotranspiration (ETo) was determined by the Penmam-Monteith (FAO) method. The maximum crop evapotranspiration was of 2.9 mm day-1, 229 days after the transplant (DAT), and the medium crop evapotranspiration during the experiment was of 1.8 mm day-1. The value of crop coefficient (Kc) varied linearly from 0.63 to 1.05, the transplant to 206 DAT. After this period, the variation of Kc presented inversely relation with the canopy diameter, being reduced to a value medium minimum of 0.81, to 300 DAT. Considering the whole period of study, it was obtained an average Kc of 0.87.
    Engenharia Agrícola 01/2008; 28(4). DOI:10.1590/S0100-69162008000400008 · 0.41 Impact Factor
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    ABSTRACT: The evapotranspiration of a crop is one of the main information required for proper irrigation management and to develop an efficient water usage plan. Among the methods to estimate the amount of water that is consumed by plants, the use of crop coefficients (Kc), associated with estimates of the reference evapotranspiration (ETo), stands as one of the most promising. This work aimed to deterime the values of Kc for different phenological phases of common bean plants (Phaseolus vulgaris L.) of the cultivar UENF-47. Determination of Kc values was performed using a weighing lisimeter and results were compared with values obtained through the FAO 56 standard. Results showed that the adjustment equations proposed by Allen et al. (1998) were adequate for fitting the values of Kc obtained in this experiment. It has been shown that the crop coefficients for phenological phases 3 and 4 proposed by Allen et al. (1998) are adequate for the conditions of crop growth observed in Campos dos Goytacazes, Rio de Janeiro state, Brazil, during the autumn/winter period.
    Revista Brasileira de Engenharia Agrícola e Ambiental 10/2007; 11(5):471-475. DOI:10.1590/S1415-43662007000500004 · 0.66 Impact Factor
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    Revista Brasileira de Fruticultura 04/2007; 29(1). DOI:10.1590/S0100-29452007000100005 · 0.49 Impact Factor
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    ABSTRACT: The objective of this study was to test an artificial neural network (ANN) for estimating the reference evapotranspiration (ETo) as a function of the maximum and minimum air temperatures in the Campos dos Goytacazes county, State of Rio de Janeiro. The data used in the network training were obtained from a historical series (September 1996 to August 2002) of daily climatic data collected in Campos dos Goytacazes county. When testing the artificial neural network, two historical series were used (September 2002 to August 2003) relative to Campos dos Goytacazes, and Vicosa, State of Minas Gerais. The ANNs (multilayer perceptron type) were trained to estimate ETo as a function of the maximum and minimum air temperatures, extraterrestrial radiation, and the daylight hours; and the last two were previously calculated as a function of either the local latitude or the Julian date. According to the results obtained in this ANN testing phase, it is concluded that when taking into account just the maximum and minimum air temperatures, it is possible to estimate ETo in Campos dos Goytacazes.
    Journal of Irrigation and Drainage Engineering 04/2007; 133(2). DOI:10.1061/(ASCE)0733-9437(2007)133:2(83) · 1.09 Impact Factor
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    ABSTRACT: Leaf area has significant effect on tree transpiration, and its measurement is important to many study areas. This work aimed at developing a non-destructive, practical, and empirical method to estimate the total leaf area of green dwarf coconut palms (Cocos nucifera L.) in plantations located at the northern region of Rio de Janeiro state, Brazil. A mathematical model was developed to estimate total leaf area values (TLA) as function of the average lengths of the last three leaf raquis (LR3), and of the number of leaves in the canopy (NL). The model has satisfactory degree of accuracy for agricultural engineering purposes.
    Scientia Agricola 11/2005; 62(6). DOI:10.1590/S0103-90162005000600014 · 0.92 Impact Factor
  • Engenharia Agrícola 01/2004; 24(3). DOI:10.1590/S0100-69162004000300019 · 0.41 Impact Factor
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    Revista Brasileira de Engenharia Agrícola e Ambiental 08/2003; 7(2):275-279. · 0.66 Impact Factor
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    01/2003; 7(2). DOI:10.1590/S1415-43662003000200015
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    ABSTRACT: Thermal units or degree day systems can both be used to quantify relationships between plants and air temperature. The Northern Fluminense region holds no tradition for irrigated papaya (Carica papaya L.) cropping and, because of the need for irrigation, it is important knowing its growth and development characteristics under these conditions. This study aimed to determine the relationship between growth rate of papaya plants and degree days, and its effect on crop productivity, under different irrigation levels. An experiment was set up with the cultivar "Improved Sunrise Soil 72/12", in a randomized blocks design, with seven irrigation water depths and three repetitions; crop growth and yield parameters were evaluated. There were significant correlations between water depths and degree days. Polynomial models of 2nd and 3rd order appropriately fitted the relationships degree day versus plant height, stem diameter, crown diameter and number of emitted leaves, for each water depth. Growth parameters related to degree days and to the applied treatments are indicative of yield potential. The total water depth that promoted the greatest fruit yield was 2,937 mm.
    Scientia Agricola 01/2003; 60(3). DOI:10.1590/S0103-90162003000300001 · 0.92 Impact Factor
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    Revista Brasileira de Fruticultura 08/2002; 24(2):547-551. · 0.49 Impact Factor
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    ABSTRACT: Entre os fatores que limitam a produtividade do mamoeiro, destacam-se a disponibilidade de água e nutrientes minerais. Assim, o ajuste de uma lâmina de irrigação adequada para a cultura exige também o monitoramento do estado nutricional das plantas. O objetivo desse trabalho foi avaliar a resposta das diferentes lâminas de irrigação (0; 40; 80; 120; 160; 200 e 240% da ETo) sobre os teores de nutrientes nas folhas do mamoeiro 'Improved Sunrise Solo 72/12'. As avaliações dos teores de nutrientes no mamoeiro foram realizadas em junho de 1999, retirando-se amostras de duas plantas de cada tratamento, das quais foram analisados, separadamente, o limbo e o pecíolo foliar. Os resultados indicam que os teores de N, P, K, Ca, Mg, B, Na, Fe e Cu, no limbo, e os teores de N, P, Ca, Mg, S, B, Na e Fe, no pecíolo, variaram significativamente com a lâmina de água aplicada. A concentração desses nutrientes em função das lâminas de irrigação foi explicada, na maioria dos casos, por regressões lineares, decrescentes para N, K e Fe, e crescente para os demais nutrientes. A variação significativa dos teores de nutrientes, em função da irrigação, mostra a necessidade de estudos que permitam o ajuste da adubação à lâmina de irrigação empregada.
    Revista Brasileira de Fruticultura 01/2002; DOI:10.1590/S0100-29452002000200053 · 0.49 Impact Factor