1,720,969 research outputs found
L'AGRICOLTURA NELLE AREE PROTETTE: ASPETTI AGRONOMICI
No full textUna delle finalità che motivano l’esistenza delle aree protette, espressa dall’art. 1 della Legge 394/91 riguarda la “promozione di attività di educazione, di formazione e di ricerca, anche interdisciplinare, nonché attività ricreative compatibili”. Considerando le molteplicità delle funzioni e la qualità di interessi e problematiche coinvolte nella gestione delle aree protette, la ricerca che più si adatta in queste aree è quella di tipo “sistemica”, inerente allo studio dei sistemi afferenti ai livelli gerarchici più elevati: colturali, aziendali e agro-territoriali.
Le ricerche riguardano oltre quelle ritenute classiche per l’agronomia, quali quelle finalizzate a problemi produttivi con l’applicazione della sostenibilità ambientale; alla protezione dell’ambiente; al contenimento del rischio dell’erosione, alla gestione delle aree pascolative; anche di altri aspetti, quali la pianificazione del territorio, alle produzioni legate ai mercati locali, ai prodotti tipici ed alle produzioni biologiche; alla gestione delle aree pascolative e delle superfici di particolare interesse della fauna selvatica; alla rinaturalizzazione di aree degradate; la gestione ecosostenibile delle acque delle aree interne, alla multifunzionalità dell’agricoltura, al miglioramento del paesaggio e la valorizzazione della biodiversità
Organo Mineral Fertilizers Increases Vegetative Growth and Yield and Quality Parameters of Pomegranate cv. Wonderful Fruits
Full text linkIn recent years, to improve sustainable production in horticultural crops, many new types of strategies have been developed, including organo-mineral fertilization to complement chemical fertilizers in order to enhance the nutritional status of plants and sustainability of the agroecosystems. This study was performed on a young pomegranate orchard of the "Wonderful" cultivar during the 2018 and 2019 seasons. The purpose was to evaluate the effects of three foliar applications (at the red ball, fruit setting, and fruit development stages) of four commercial organo-mineral fertilizers (Hendophyt((R)), Ergostim XL (R), Siapton((R)) 10L, and Allibio Rad((R))) on vegetative growth, yield, and several other physico-chemical parameters of the fruits, throughout each season. The results obtained showed several differences between the two years. The annual trunk growth of trees under all compared treatments showed significantly lower values in 2018 (average 9.7 mm) than in 2019 (average 11.8 mm). At the end of the two-year period, the biostimulant treatments resulted in significantly larger trunk diameters (average 43.6 mm) than the control (39.6 mm). Only in 2018, significantly higher number of fruits per tree, number of arils per fruit, edible part, and juice yield were obtained under biostimulant treatments compared with the control. No differences among treatments were observed for any color parameters or physico-chemical traits in the fruits for either year. In 2019, fruit morpho-pomological properties tended to be lower than in 2018, while in contrast, total phenol content and antioxidant activity were higher. The warmer and windier weather conditions of 2019 probably led to greater plant stress conditions, with a reduction in fruit size and an increase in the bioactive compounds of juice. In conclusion, due to the various positive results, foliar organo-mineral fertilizers could be recommended to improve the performance of pomegranate Wondeful cv. under similar conditions
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
Effects of different irrigation regimes on vegetative growth, yield and fruit quality of young pomegranate (Punica granatum 'Wonderful') trees
No full textIn this study, a field experiment was conducted during two successive seasons (2017 and 2018) and corresponded to the first two years of ‘Wonderful’ pomegranate plant growth, when water irrigation management is a critical aspect for the successful cultivation for commercial production. In semiarid regions of Italy, water is a scarce resource and its efficient use has to be prioritize. The trial was designed with the objective to search for an optimum irrigation scheduling by analyzing the effects of four different irrigation regimes (100, 75, 50, and 25% of crop evapotranspiration (ETc) on young trees to optimize vegetative growth, yield and fruit quality. The pomegranate commercial orchard (5.5×3 m apart), drip irrigated, was located in the countryside of Foggia (Apulia region, Southern Italy). Weekly values of ETo and kc, estimated by climatological data with the shaded area approaches, were used. Results showed that after two consecutive seasons the largest increase of the trunk girth (73.8 mm) was obtained in the 100% ETc treatment that resulted significantly higher than in the 75, 50 and 25% ETc ones (62.6, 60.5 and 57.7 mm, respectively). Annual shoot growth, total yield per tree, number of fruits per tree and size of fruits, recorded only on the second season, decreased significantly with the restriction of ETc water volumes applied to the crop. While, total polyphenols and antioxidant activity in pomegranate juices were higher in the water deficit treatments (average 4359 mg GAE L-1 and 37.99 mol TE L-1, respectively) than the full irrigated one (3466 mg GAE L-1 and 29.39 mol TE L-1, respectively). Finally, minor differences among irrigation treatments in the soluble solids, pH and color of fruit skins, arils and juices were observed
Essential oil characterization of Prunus spinosa L., Salvia officinalis L., Eucalyptus globulus L., Melissa officinalis L. and Mentha x piperita L. by a volatolomic approach
No full textIn this study a volatolomic approach is proposed for the characterization of the volatile organic compound (VOC) composition of essential oils (EOs) extracted from common aromatic plants. Five species (Prunus spinosa L., Salvia officinalis L., Eucalyptus globulus L., Melissa officinalis L. and Mentha x piperita L.), particularly widespread in Southern Italy, were selected as recognized sources of natural bioactive compounds with beneficial properties. Hydro distillation and solid-liquid extraction with ethanol at different percentages were used to obtain EOs, and their extraction capabilities were compared analyzing chromatographic profiles obtained by headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography - mass spectrometry (GC-MS). The analytical procedure was optimized in term of SPME fiber, adsorption time and desorption time. GC-MS analyses were performed allowing the profiling of the VOC fingerprint in each plant extract. Experimental data were processed by a statistical multivariate approach (Analysis of Variance and Principal Component Analysis obtained for compounds and chemical classes), confirming that EO aroma profiles were statistically different for each of the selected five plants. The proposed volatolomic approach has proved to be an easy and efficient tool to study the aroma profile, allowing the collection of specific information and opening new perspectives and opportunities for the detection and identification of VOCs in agricultural and ecological applications
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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