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Search Results: 1 - 10 of 65747 matches for " Carlos Alberto Scapim "
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Predicción de Valores Genéticos del Efecto de Poblaciones de Maíz Evaluadas en Brasil y Paraguay
Mora,Freddy; Scapim,Carlos Alberto;
Agricultura Técnica , 2007, DOI: 10.4067/S0365-28072007000200003
Abstract: the aim of this study was to evaluate the performance of seven popcorn ( zea mays l.) populations of avati pichinga landrace, established in different sites of brazil and paraguay, determining and analyzing the empirical best linear unbiased predictor (eblup) of population effect, and estimating covariance parameters by the restricted maximum likelihood (reml) method, for commercial and agronomic characteristics. ten models were investigated for fitting an appropriate inter-genotype covariance structure. akaike and bayesian information criteria were used to compare alternative models. the covariance structures chosen were toeplitz with three bands, for grain yield; toeplitz with two bands for both popping expansion and plant height; autoregressive for ear height; and variance component for blooming. population effect was significant for all the agronomic traits, unlike genotype-environment interaction. spearman correlation coefficients were not significant between grain yield and popping expansion ranking. p4 and p5 can be considered as promissory populations according to their predicted breeding values for grain yield; p1 and p4 for popping expansion. these populations can be regarded as useful for popcorn breeding programs.
Cold Storage of Pineapple ‘Smooth Cayenne Under Different Types of Packaging
Edmar Clemente,Carlos Alberto Scapim
Journal of Food Technology , 2013,
Abstract: Postharvest storage is important for any system of fruit commercialization. This work was carried out to study the influence of two temperatures (80C and 120C), and two packaging types (unpacked was the control, perforated and not perforated polyethylene packaging) on the blackheart of pineapples (Ananas comosus (L) Merr.) cv. Smooth Cayenne. A higher number of fruit were affected by endogenous darkening at 80C. The incidence of this disorder was more rapid and with higher intensity at 80C than 120C. In both temperatures, the unpacked fruit were more affected by this injury, while the fruit kept in not perforated polyethylene showed less darkening. There was an increase in soluble solids, total acidity and fresh weight loss as the endogenous darkening increased, and a decrease in flesh firmness and pH. The pH was higher and the total acidity was lower in the unpacked fruits. Firmness declined during cold storage and showed a high influence of the packaging type.
Predicción de Valores Genéticos del Efecto de Poblaciones de Maíz Evaluadas en Brasil y Paraguay Predicting Breeding Values of Population Effect of Maize Evaluated in Brazil and Paraguay
Freddy Mora,Carlos Alberto Scapim
Agricultura Técnica , 2007,
Abstract: El objetivo de este estudio fue evaluar el comportamiento de siete poblaciones de maíz ( Zea mays L.) tipo roseta, o palomita, de la raza Avati Pichinga , establecidas en diferentes localidades de Brasil y Paraguay. Se determinó la mejor predicción lineal no sesgada empírica (EBLUP), con estimaciones de parámetros de covarianza vía método de máxima verosimilitud restringida (REML), en características de importancia comercial y agronómica. Se investigaron diez modelos con diferentes estructuras de covarianzas en la matriz intergenotípica. Los criterios de información de Akaike y Bayesiano de Schwarz se utilizaron para la comparación entre los modelos. Las estructuras de covarianza escogidas fueron Diagonal de tres bandas para el rendimiento de granos, Diagonal de dos bandas para la capacidad de expansión y la altura de planta, Auto-regresiva de primer orden para la altura de mazorca, y tipo componentes de varianza para la floración masculina. El efecto de poblaciones fue significativo, al contrario de la interacción genotipo-ambiente. Correlaciones de Spearman fueron no significativas entre rendimiento y capacidad de expansión. Las poblaciones P4 y P5 se ven promisorias al considerar su valor genético del rendimiento, y P1 y P4 para capacidad de expansión. Tales poblaciones pueden ser consideradas útiles para el programa de mejoramiento. The aim of this study was to evaluate the performance of seven popcorn ( Zea mays L.) populations of Avati Pichinga landrace, established in different sites of Brazil and Paraguay, determining and analyzing the empirical best linear unbiased predictor (EBLUP) of population effect, and estimating covariance parameters by the restricted maximum likelihood (REML) method, for commercial and agronomic characteristics. Ten models were investigated for fitting an appropriate inter-genotype covariance structure. Akaike and Bayesian information criteria were used to compare alternative models. The covariance structures chosen were Toeplitz with three bands, for grain yield; Toeplitz with two bands for both popping expansion and plant height; autoregressive for ear height; and variance component for blooming. Population effect was significant for all the agronomic traits, unlike genotype-environment interaction. Spearman correlation coefficients were not significant between grain yield and popping expansion ranking. P4 and P5 can be considered as promissory populations according to their predicted breeding values for grain yield; P1 and P4 for popping expansion. These populations can be regarded as useful for popcorn breeding prog
Agronomic traits and chemical composition of single hybrids of sweet corn
Kwiatkowski, Angela;Clemente, Edmar;Scapim, Carlos Alberto;
Horticultura Brasileira , 2011, DOI: 10.1590/S0102-05362011000400015
Abstract: in brazil, the greengrocery market of sweet corn has been expanding along the country. in contrast, there have been few agri-industries canning sweet corn (zea mays) because of the lack of cultivars with agronomic characteristics proper to industrial purposes. the purpose of this study was to evaluate the general combining ability (gca) of seven inbred lines of sweet corn, and the specific combining ability (sca) of their hybrid combinations based on their agronomic traits, and the chemical composition of the grain. in the growing season 2006/2007, twenty-one single hybrids were evaluated in the iguatemi research station, maringá county, northwestern paraná, in brazil using a complete randomized block design with four replications. data were subjected to the analysis of variance and the genotypes were clustered by the scott-knott test. we estimated the gca and sca effects using the griffing's method iv with the fixed model for plant height (ph), height of ear (eh), dehusked ears yield (dey), reducing (rs) and total sugars (ts), starch (st), proteins (ptn), ether extract (ee) and fibers (fb). the inbred line l4, which was originated from the 'doce de cuba', had the best gca for crop yield and grain quality and therefore should be used in the next hybrid combinations. the hybrids l4xl5 and l3xl7 were the most promising with regard to crop yield and grain quality.
Genetic parameters of growth and survival in Acacia saligna shrubs
Mora,Freddy; Perret,Sandra; Scapim,Carlos Alberto; Arnhold,Emmanuel;
Ciencia e investigación agraria , 2010, DOI: 10.4067/S0718-16202010000200001
Abstract: acacia species have valuable agronomic characteristics, such as the tolerance to unfavorable environmental conditions. in this study, genetic parameters and selection response in acacia saligna shrubs were investigated in two arid environments of northern chile: cuz-cuz and el tangue. the quantitative traits were assessed in 5 year-old shrubs. a bayesian approach, implemented using gibbs sampling algorithm, was used in the data analysis. the tree survival was 87.3% and 81.8% in cuz-cuz and el tangue, respectively, confirming the potential of a. saligna in northern chile. the estimates of posterior mode of the heritability ranged from h2=0.13 (survival) to h2=0.25 (shrub crown diameter). estimated genetic gain (individual tree selection) ranged from 6 to 14% (selection intensity of 20%). bayesian credible intervals (p=95%) for genotype-environment correlations included zero, indicating a significant interaction for survival, crown diameter and height. shrub selection in multipurpose planting will depend on optimizing economical traits by selecting genotypes that perform well on a particular environment.
Predicción del efecto de cultivares de algodón en la presencia de interacción genotipo-ambiente
Mora,Freddy; Osmério,Pupim-Junior; Scapim,Carlos Alberto;
Ciencia e investigación agraria , 2007, DOI: 10.4067/S0718-16202007000100002
Abstract: we aimed to obtain, by the best linear unbiased predictor (blup), a prediction of the cultivar effect of 14 cotton cultivars (gossypium hirsutum) established at different sites in brazil and paraguay during the 2003-2004 growing season. the blup of cotton yield was compared with classical stability analysis according to the plaisted and peterson, wricke, annicchiarico and lin and binns models. the independence chain (ic) algorithm, within a bayesian framework, was also utilized for comparison. a likelihood ratio test provided evidence of significant differences for cultivar and genotype-environment interaction effects. these results were confirmed by akaike and bayesian information criteria. most spearman and pearson correlation values were not significant site-to-site (p>0.05), varying from -0.037±0.307 to 0.565±0.290 and from -0.228±0.336 to 0.604±0.257, respectively. the plaisted and peterson and wricke methods showed no significant correlation with blup, ic, annicchiarico and lin and binns. on the other hand, spearman rank coefficients were high and significant (p<0.01) between blup and annicchiarico (0.859±0.151) and blup and lin and binns (-0.899±0.099). blup and ic, based on mean and median posterior estimates, had identical ranks. cd-406 and cd99-2221 were the cultivars that evidenced superior stability, as confirmed equally by blup, ic, annicchiarico and lin and binns, indicating a significant concordance between approaches in relation to genotypic stability. a mixed linear models methodology allows us to get important genotypic information of cotton cultivars with both high productivity and stability in the environments where they will be cultivated by farmers
Espacializa??o vertical e horizontal dos indicadores de qualidade para um latossolo vermelho cultivado com citros
Fidalski, Jonez;Tormena, Cássio Antonio;Scapim, Carlos Alberto;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000100002
Abstract: the objective of this report was to verify the form of vertical and horizontal spatialization of chemical, physical and water quality indicators of a typic haplortox cultivated with citrus. the 'valencia' orange grove on 'rangpur' lime was planted in 1995, in the county of alto paraná, northwestern paraná, brazil. in august 2002, undisturbed and disturbed samples were collected for chemical, physical and water analysis. twenty-four transects were sampled perpendicular to the tree trunk, in two layers (0-0.20 and 0.20-0.40 m depth) and three sampling positions (tree crown projection, underneath the wheel track and between the wheel tracks). the indicators measured were submitted to multivariate analysis by main components and were grouped by the tocher method. the soil quality demonstrated heterogeneous spatialization among the soil physical, chemical and water soil quality indicators, as a result of the management actions on the plantation. the integration of the soil indicators of physical, chemical and water quality characterized a vertical spatialization (0-0.40 m) in the tree crown projection and vertical and horizontal spatialization (0-0.20 and 0.20-0.40 m) underneath and between the wheel tracks. underneath the wheel tracks (0-0.20 m) the physical and water restrictions were strongest while soil chemical conditions for orange trees were the best.
Dissimilaridade de porta-enxertos da laranjeira 'folha murcha' sob dois sistemas de manejo de cobertura permanente do solo
Fidalski, Jonez;Scapim, Carlos Alberto;Stenzel, Neusa Maria Colauto;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000200017
Abstract: citurs rootstocks are dependent of the growdcover management systems. this study aimed to identify the divergences of seven rootstocks for 'folha murcha' sweet orange trees in two groundcover management systems on a paleudult. the study was performed at the iapar research station, in paranavai, northwestern paraná, brazil. the experiment was in a complete random block design with threer replications for the bahiagrass (paspalum notatum flügge) groundcover treatment and one replication for the perennial groundnut legume (arachis pintoi krap. & greg.). yield, vegetative growth and leaf nutrient contents were evaluated yearly in 'folha murcha' sweet orange trees (1997 to 2002). multivariate analyses were based on canonic variables and main components, which were grouped according to the tocher's method. the groundcover management with perennial peanut legume reduced the differences among rootstocks of 'folha murcha' orange trees. on the other hand, the groundcover management with bahiagrass increased the divergence among rootstocks regarding leaf nutrients, fruit yield and vegetative growth of orange trees. bahiagrass is a preferable cover crop when aiming to evaluate the performance of grafted 'folha murcha' orange trees.
Early performance of Olea europaea cv. Arbequina, Picual and Frantoio in the southern Atacama Desert
Freddy Mora,Francisco Tapia,Carlos Alberto Scapim,Elias Nunes Martins
Crop Breeding and Applied Biotechnology , 2008,
Abstract: The cultivars Arbequina, Picual and Frantoio of Olea europaea are cultivated in severalMediterranean countries. In 1999, these cultivars were planted at three locations in the region of Coquimbo,an arid, Mediterranean-like area in Chile. A generalized linear modeling approach was used in view of thenon-normal distribution of the agronomic data sets. Fruit yield (harvests of 2002-2003), precocity (2002) andtree survival (after four growing seasons) differed significantly between the cultivars. Arbequina and Picualhad a positive effect on the yield. Picual was the earliest cultivar at two sites. The survival rate of Frantoio washigh at the three sites (90-100%), as opposed to Picual (56-83%). The approach of Generalized Linear Modelswas particularly useful where the assumption of normality was not satisfied. The selection of cultivars ispromising in this arid region of Chile, while the success will depend on the selection of well-adapted genotypesto a particular location.
Influência de sistemas de plantio e armadilha adesiva na incidência de Frankliniella williamsi Hood na cultura do milho = Influence of planting systems and adhesive trap on the incidence of Frankliniella williamsi Hood in crop maize
Fernando Alves de Albuquerque,Wilson Badiali Crocomo,Carlos Alberto Scapim
Acta Scientiarum : Agronomy , 2006,
Abstract: Esta pesquisa objetivou avaliar a influência de diferentes sistemas de plantio de milho e o efeito de armadilha adesiva na incidência de Frankliniella williamsi Hood. Os tratamentos consistiram no plantio direto do milho sobre aveia dessecada com glyphosate, aveia tombada, aveia ro ada e plantas daninhas, aveia incorporada e plantio convencional. Alguns tratamentos foram associados a armadilha adesiva de colora o azul, colocada horizontalmente no centro da parcela. Verificou-se que tanto a presen a de armadilha quanto os diferentes sistemas de plantio influíram significativamente na infesta o das plantas de milho pelo tripes, sendo que os tratamentos “aveia dessecada” e “aveia ro ada e plantas daninhas” apresentaram menor incidência do inseto, com esse efeito diminuindo com o desenvolvimento das plantas. This research aimed to evaluate the influence of different systems of corn planting and the effect of adhesive trap on the incidence ofFrankliniella williamsi. The treatments consisted of sowing the corn seed directly on oats dried by glyphosate, tilt oats, cut oats and weeds, incorporated oats, and also conventional planting. Some treatments were associated with adhesive trap of blue coloration, puthorizontally in the center of the plot. Results showed that the presence of traps, as well as the different planting systems influenced significantly on the thrips infestation, and the treatmentswith "dry oats" and "cut oats and weeds" presented smaller incidence of the insect with a decreasing effect along the plants growth.
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