1,720,969 research outputs found
Changes in the Reproductive Traits of Low-chill Peach Tree in Response to Reproductive Shoot Pruning after Harvesting
Full text linkABSTRACT: At the central-east area of the Santa Fe province (Argentina), early maturing peach varieties characterised by a long remaining growing season after harvest are used. The aim of this works was to study the effects of fruit-bearing shoots renovation, performed just after harvest, on different vegetative and reproductive parameters of peach tree, in comparison with the traditional winter pruning. After harvest, a group of plants remained unpruned as control trees (T0), whereas another group was pruned (T1). Pruning consisted of heading back or thinning out the recently harvested bearing shoots. Green pruning significantly increased the relative radiation measured in the canopy for more than 80 days after pruning, modifying the architecture of the aerial part of the tree. The relative proportion of the different bearing shoots was not affected by pruning treatment but green pruning increased the proportion of mixed shoots that arose from the main tree scaffold (+15%) and those that were inserted in the intermediate strata of plant height. Trees pruned after harvest were able to compensate the leaf area removed by the emission of new branches (+108%) in the remained shoots, but were unable to compensate TCA annual evolution (-37.4%) and plant size (?7 to -26%). Green pruning extended the vegetative growth period during autumn, delaying leaf senescence (+10 days) and dormancy induction. Tree yield and fruit size were not affected by pruning treatments.Fil: Weber, M.. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Castro, Damian Cesar. Universidad Nacional del Litoral; ArgentinaFil: Micheloud, Norma. Universidad Nacional del Litoral; ArgentinaFil: Bouzo, Carlos Alberto. Universidad Nacional del Litoral; ArgentinaFil: Buyatti, Marcela Alejandra. Universidad Nacional del Litoral; ArgentinaFil: Gariglio, N.. Universidad Nacional del Litoral; Argentin
Effect of fertilization and container size on the quality of “Sangre de Drago” (Croton urucurana Baill.) seedlings in a plug + 1 production system
No full text“Sangre de Drago” (Croton urucurana Baill.) is a native tree of South America with high value for urban afforestation or the restoration of riparian forests. This study aimed to evaluate the effect of container size and fertilization on the quality of seedlings produced in a plug+1 system. In the establishment phase, the impact of container size (110 mL or 250 mL) and fertilization (with or without) on seedling quality were evaluated before transplanting into bigger containers. In the rapid growth phase, the effect of container size (1 L, 1.5 L, and 3.5 L) on survival and seedling quality was evaluated. At the end of each phase, seedling quality was evaluated through morphological and physiological attributes. Data were analyzed through linear models, generalized linear models, and nonlinear regressions. In the establishment phase, seedlings grown in 250 mL containers with fertilization showed the best performance in morphological and physiological variables and the Dickson quality index. In the rapid growth phase, seedlings grown in 3.5 L containers showed the highest values in total height, stem diameter, total dry weight, Dickson quality index, and the lowest mortality at the end of the experiment. We recommended 250 mL containers with fertilization in the establishment phase until the seedling can be lifted with its intact root ball. We then transplant it into 3.5 L containers for the rapid growth and hardening phases until out-planting.Fil: Martin, Mariana. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Castro, Damian Cesar. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gabriel, Paola Marisel. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Micheloud, Norma. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Alvarez, Norma Hortensia. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Buyatti, Marcela Alejandra. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentin
Study of reproductive behaviour in low-chill apples in warmer zones of Argentina
Full text linkThe domesticated apple (Malus × domestica Borkh.) showsabnormalities in its flowering biology when it is growing in mild-winterareas. Hence, the flowering phenology and the mating system (e.g., open-,cross- and self-pollination, apomixis and parthenocarpy) of Caricia, Eva,and Princesa apple cultivars were studied in three consecutive growingseasons. The flowering period ranged between August and October with widevariation between years, especially in relation to the overlapping of thefull-bloom periods. Fruit set by selfing was significant, reaching a meanvalue of 20% with a minimum of 4.5% and a maximum of 43.7%, depending onthe growing season and the cultivar. The self-incompatibility indexshowed significant changes between years in Eva and Princesa but not inCaricia. Fruit and seed set were significantly greater in cross- andopen-pollination treatments than by self-pollination, apomixis orparthenocarpy. Those variables were affected by a growing season ×treatment interaction. The results indicated that Caricia, Eva, andPrincesa apples show partial to full self-incompatibility, dependingstrongly on the growing season. However, better fruit and seed set ratesare obtained by cross-fertilizationFil: Castro, Damian Cesar. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Cerino, María Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Gariglio, Norberto Francisco. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Radice, Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Moron. Facultad de Agronomia y Ciencias Agroalimentarias. Laboratorio de Investigaciones En Fisiología Vegetal; Argentin
Effect of NAA concentrations on rooting of hardwood cuttings of Croton urucurana Baill., Tabernaemontana catharinensis A. DC. and Paullinia elegans Cambess
Full text linkEl objetivo de este trabajo fue evaluar el enraizamiento de estacas de Croton urucurana Baill., Tabernaemontana catharinensis A. DC. y Paullinia elegans Cambess conocidas en Argentina como “Sangre de drago” (SD), “Horquetero” (TC) y “Ojo de muñeca” (PE), respectivamente. Se recolectaron 200 estacas leñosas por especie; una vez defoliadas se aplicó ácido naftalén acético (ANA) en las siguientes dosis: 0, 1000, 2500 y 3500 mg.L-1 en SD y TC y 0, 500, 1000 y 2500 mg.L-1 en PE. Se evaluó la formación y calidad de raíces y el diámetro de las estacas a la altura del cuello (DAC). En SD las dosis de ANA ≥1000 mg.L-1 aumentaron la probabilidad de enraizamiento de 0,36 a 0,71. En PE hubo baja probabilidad de enraizamiento (0,13) independientemente de la dosis de ANA, pero aumentó en función del DAC. No se observó formación de raíces en TC. La calidad de enraizamiento no fue afectada por la diferentes dosis de ANA, pero sí el DAC en SD.The objective of this work was to evaluate the rooting potential of “Sangre de Drago” (SD: Croton urucurana Baill.), “Horquetero” (TC: Tabernaemontana catharinensis A. DC.) and “Ojo de muñeca” (PE: Paullinia elegans Cambess.) cuttings by immersion in 1-Naphthaleneacetic acid (NAA). Two hundred cuttings without leaves per species were collected and immersed in 0, 1000, 2500 and 3500 ppm of NAA (for SD and TC) and 0, 500, 1000 and 2500 ppm of NAA for PE. At the end of the rooting period the following variables were registered on each cutting; the presence of roots, diameter at the base of the cutting (DAC) and rooting quality. Rooting probability was highest (0.76) for NAA than control (0.36) on SD cuttings. The rooting probability was very low on PE regardless of the NAA dose (0.13) but was directly proportional to the DAC. Root formation was not observed on TC, regardless of the NAA dose nor DAC. Rooting quality was unaffected by NAA dose but highly related to DAC in SD.Fil: Biganzoli, M.. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Castro, Damian Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Ghío, N.. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Gabriel, P. M.. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Alvarez, N.. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Buyatti, Marcela Alejandra. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentin
Efecto de la aplicación de Ácido Naftalén Acético sobre el enraizamiento de estacas leñosas de Croton urucurana Baill
Full text linkEl objetivo de este trabajo fue evaluar el enraizamiento de estacas de Croton urucurana Baill., Tabernaemontana catharinensis A. DC. y Paullinia elegans Cambess conocidas en Argentina como “Sangre de drago” (SD), “Horquetero” (TC) y “Ojo de muñeca” (PE), respectivamente. Se recolectaron 200 estacas leñosas por especie; una vez defoliadas se aplicó ácido naftalén acético (ANA) en las siguientes dosis: 0, 1000, 2500 y 3500 mg.L-1 en SD y TC y 0, 500, 1000 y 2500 mg.L-1 en PE. Se evaluó la formación y calidad de raíces y el diámetro de las estacas a la altura del cuello (DAC). En SD las dosis de ANA ≥1000 mg.L-1 aumentaron la probabilidad de enraizamiento de 0,36 a 0,71. En PE hubo baja probabilidad de enraizamiento (0,13) independientemente de la dosis de ANA, pero aumentó en función del DAC. No se observó formación de raíces en TC. La calidad de enraizamiento no fue afectada por la diferentes dosis de ANA, pero sí el DAC en SD.Effect of NAA concentrations on rooting of hardwood cuttings of Croton urucurana Baill., Tabernaemontana catharinensis A. DC. and Paullinia elegans Cambess. The objective of this work was to evaluate the rooting potential of “Sangre de Drago” (SD: Croton urucurana Baill.), “Horquetero” (TC: Tabernaemontana catharinensis A. DC.) and “Ojo de muñeca” (PE: Paullinia elegans Cambess.) cuttings by immersion in 1-Naphthaleneacetic acid (NAA). Two hundred cuttings without leaves per species were collected and immersed in 0, 1000, 2500 and 3500 ppm of NAA (for SD and TC) and 0, 500, 1000 and 2500 ppm of NAA for PE. At the end of the rooting period the following variables were registered on each cutting; the presence of roots, diameter at the base of the cutting (DAC) and rooting quality. Rooting probability was highest (0.76) for NAA than control (0.36) on SD cuttings. The rooting probability was very low on PE regardless of the NAA dose (0.13) but was directly proportional to the DAC. Root formation was not observed on TC, regardless of the NAA dose nor DAC. Rooting quality was unaffected by NAA dose but highly related to DAC in SD.Fil: Biganzoli, Mariano. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Castro, Damian Cesar. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ghio, Nerio. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Gabriel, Paola. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Alvarez, Norma Hortensia. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Instituto de Ciencias Agropecuarias del Litoral. - Universidad Nacional del Litoral. Instituto de Ciencias Agropecuarias del Litoral.; ArgentinaFil: Buyatti, Marcela Alejandra. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentin
External Fruit Quality and Harvest Time of Low-Chill Peach and Nectarine Varieties at Santa Fe, Argentina
Full text linkBackground: We studied low chilling peach varieties recently introduced at the central area of Santa Fe, Argentina, to increase the range of options available to growers of warm-temperate areas. Objective: The aim of this study was to evaluate the external fruit quality and the harvest time of different low-chill peach and nectarine varieties in central Argentina.
Results: The harvest period began on the last week of October and extended continuously until the end of December. Although the different varieties ripened in an adequate sequence throughout the season, the second week of November was a critical period in which six varieties reached maturity simultaneously. On the other hand, only a limited number of varieties ripened during the second and fourth weeks of December. Fruit size of peach but not of nectarine showed a positive and significant relationship with the length of the fruit development period. Three peach varieties (‘Flordastar’, ‘Rojo dos’ and ‘San Pedro 1633’) and four nectarines (‘Sunwright’, ‘Nectarine 24’, ‘Carolina’, and ‘Brasil’) produced small fruits (<100 g), which can affect their marketing. Red over-color on the skin was deficient, since only seven varieties developed 50% of red cover.
Conclusion: The new varieties tested are suitable for extending the harvest period at the central area of Santa Fe, and will increase the range of options available to growers. However, before recommending its use, internal quality and fruit yield of these varieties should be evaluated for more years.Fil: Giovanelli, Carolina. Università di Padova; ItaliaFil: Bouzo, Carlos Alberto. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Ribero, Gustavo Gabriel. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; ArgentinaFil: Castro, Damian Cesar. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; ArgentinaFil: Micheloud, Norma. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; ArgentinaFil: Gariglio, Norberto Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentin
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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