1,720,970 research outputs found
Caffè, buone prospettive per la coltivazione in ambiente protetto
No full textI cambiamenti climatici potrebbero ridurre fortemente le aree vocate alla coltivazione del caffè con importanti conseguenze sulla produzione mondiale. Di contro, aree geografiche dove ad oggi il caffè non è presente potrebbero aprirsi alla sua coltivazione grazie anche all’impiego di apprestamenti protettivi. Tra queste, un ruolo importante potrebbero averlo le aree geografiche a clima mediterraneo dove esistono piccole coltivazioni amatoriali. In Sicilia, i primi tentativi di introduzione della pianta del caffè risalgono all'inizio del Novecento.
in Sicilia, i primi tentativi di introduzione
della pianta del caffè risalgono all’inizio
alla sua coltivazione grazie anche all’impiego
di apprestamenti protettivi. Tra queste,
un ruolo importante potrebbero averlo le
aree geografiche a clima mediterraneo
dove esistono piccole coltivazioni amatoriali.
in Sicilia, i primi tentativi di introduzione
della pianta del caffè risalgono all’inizi
Coltivazione del mango: la buona riuscita dipende dal microclima
No full textNelle ultime decadi la coltivazione della frutta tropicale in Italia ha subito un incremento notevolissimo sull’onda del cambiamento climatico e di un accresciuto interesse da parte dei mercati e dei consumatori. Sono aumentate esponenzialmente le superfici dedicate alla coltivazione di avocado, molte serre sono state riconvertite dagli ortaggi alla coltivazione di papaya e, soprattutto, moltissimi agricoltori hanno investito nell’impianto del mango
A new soilless cultivation system for tomato production in southern Italy
Full text linkSouthern Italy boasts the second-largest greenhouse horticultural production area in Europe, covering around 9,000 hectares. Fresh market tomatoes are a significant greenhouse crop in Sicily, with nearly 3,038 hectares and a total production of 203,223 tons. Greenhouse tomato cultivation involves both soil and soilless systems with various substrates. Effective management of water and fertilizer in this context hinges on a comprehensive dataset encompassing environmental, soil, and crop information, crucial for informed decision-making. To avoid resource waste, environmental damage, and unstable yields, it is imperative to develop sustainable greenhouse systems, especially considering the growing global population and increased food demand. Among the methods that do not require a substrate, there is an innovative approach known as "agriponic." In this approach, tomato plants (1.5 plants/m2) were positioned above closed polystyrene channels. Their roots, partially suspended and in contact with the channel's bottom, receive intermittent fertigation sprays, with excess solution recaptured for reuse, forming a closed-loop system. These systems contribute to reduced water and nutrient consumption. The study was aimed at evaluating the performance and resource efficiency of the "agriponic" closed-loop system in a 1,200 m2 greenhouse in southern Italy, comparing it to a traditional soil-based system. Data on greenhouse climate, water, and nutrient inputs were gathered during the experiment. Plant growth, phenology, and leaf gas exchange and production data were registered during the tomato life cycle (January to July). In the "agriponic" system, in the first months, plant growth was slower compared to the soil-based system, which was consistent with photosynthetic measurements. However, there were no differences in phenological stage timing between the two systems. The first harvest, carried out 122 days after transplanting, revealed a higher tomato yield in "agriponic" in comparison to the soil-based system. The "agriponic" system demonstrated a decrease in water and nutrient usage, showcasing its strong environmental sustainability and efficient capability for tomato production
Invasion of the erinose mite Aceria litchii (Eriophyoidea, Eriophyidae) in Europe
No full textLitchi has been cultivated in Italy for about two decades without showing symptoms caused by most of the phytophagous pests associated with this plant worldwide. The first record of the tiny eriophyid mite Aceria litchii in Italy and Europe is here reported, with a brief review on the knowledge on this species
La coltivazione sotto rete o film plastico a copertura parziale non altera l’attività fotosintetica o i tratti qualitativi del mango “Kensington Pride”
No full textLa coltivazione del mango in ambiente protetto si diffonde sempre più nel bacino del Mediterraneo,
dove la specie incontra spesso condizioni climatiche sfavorevoli e che non rispecchiano quelle dei suoi
areali di origine. Oltre alla coltivazione in serra fredda, sono stati recentemente sperimentati altri metodi
di coltivazione protetta come la coltivazione sotto rete antigrandine o ombreggiante, o i film plastici a
copertura parziale. Questi sistemi offrono una protezione dagli eventi atmosferici estremi sia d’inverno
che durante le calde e secche estati mediterranee. In questo studio, ci siamo concentrati sul valutare l’effetto
della presenza di due sistemi di protezioni, consistenti in una rete ombreggiante al 20% e in un film
plastico posto al di sopra della fascia produttiva degli alberi, sulla varietà di mango Kensington Pride
coltivata nella costa nord-orientale siciliana. In particolare, ci siamo chiesti se la presenza di questi sistemi
di protezione inficiasse il processo di colorazione del frutto di mango, la sua qualità finale e l’attività
fotosintetica delle piante. Pertanto, abbiamo sviluppato un metodo innovativo per la misurazione del
colore del frutto di mango durante la sua crescita, effettuato misure dell’attività fotosintetica durante l’estate
e misurato le principali caratteristiche qualitative del frutto alla raccolta, il tutto monitorando le
condizioni climatiche all’interno dei frutteti interessati dai trattamenti. Non sono emerse differenze significative
tra i trattamenti e il controllo per quanto riguarda la colorazione dei frutti e la loro qualità finale.
Si è osservato che le piante coltivate all’interno dei sistemi di protezione, invece, mantengono un tasso di
fotosintesi stabile col decrescere delle temperature alla fine dell’estate, quando invece lo stesso si abbassa
nelle piante del controllo coltivate in pieno campo. I risultati ottenuti confermano che la presenza di
sistemi di protezione come quelli osservati, pensati per proteggere il frutteto durante tutto l’anno, non è
causa di alterazioni significative della fisiologia del frutto o delle foglie, almeno durante il periodo più
caldo dell’anno. Ricerca finanziata nell’ambito del progetto Innovazioni genetiche, colturali e post-raccolta
per la filiera del mango in Sicilia INNO.M.A.M. - PSR Sicilia 2014/2020 sottomisura 16.1
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
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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