1,720,961 research outputs found
Distribuzione e caratteristiche dei cristalli di ossalato di calcio in organi vegetativi e riproduttivi della vite
No full textOsservazioni comparative sull'attitudine al distacco ed allo schiacciamento degli acini di alcuni vitigni ad uva bianca
No full textRicerche sulla densità di piantagione del "Sangiovese" in Maremma Toscana: risultati di un triennio di osservazioni
No full textChoice of appropriate planting density results from a compromise between the need for machine access to carry out crop management practices and achievement of an adequate qualitative level of the product.
Recently there has been increas¬ing interest in evaluating factors capable of exerting positive influ¬ence on grape quality, with special emphasis on adopting higher plant¬ing densities. The present research was therefore undertaken to improve knowledge of "Sangiovese" production behaviour at different planting densities in the environ¬ment of the Tuscan Maremma, specifically in the Monteregio Doc: zone of Massa Marittima (province of Grosseto).
The trial was conducted in 1998-1999 in a vineyard set up in 1994, comparing four planting densities (2,8 x 1,2; 2,0 x 1,5; 2,5 x 1,0; 2,0 x 0,75) ranging from a minimum of 2980 to a maximum of 6670 vines/ha.
The results showed that the four planting densities adopted seems not to have had relevant influence on grape quality and yield, even though we can observe a higher veg¬etative activity per unit surface area at the highest planting density.
Since the vegetative behaviour was not accompanied by a higher grape quality, we can observe that, in spite of classical idea, vines at the higher painting densities didn't show any vigour reduction caused by vines competition.
We can therefore conclude that the influence of planting densities on grape quality depends on several technical and agronomic factors like variety, rootstock, cultural practices, canopy spatial distribu¬tion, exposed surface area and pedo-climatic conditions.
It is therefore necessary not to extend the result observed in a cer¬tain area to all viticultural zone.
The results showed in the present work refers to young vines and for this reason they have to be considered as preliminary observations
Trials with Sangiovese grafted on several grapevine rootstocks in two different areas of Tuscany
No full textResearches were conducted in the ‘Morellino di Scansano’ D.O.C. area, province of Grosseto and in the area of D.O.C.G. ‘Chianti Classico’, province of Florence. The experimental vineyards were set up in 1993 and 1994 in Chianti Classico and in the Morellino di Scansano’ area respectively with ‘Sangiovese’ grapevines grafted onto twelve rootstocks (‘101-14Mgt’, ‘1103P’, ‘110R’, ‘140Ru’, ‘161-49’, ‘3309C’ ‘41B’, ‘420A’, ‘775P’, ‘779P’, ‘K5BB’, ‘SO4’)., In addition Gravesac was planted in the first zone and eight more rootstocks ('Rupestris Du
Lot', '157-11', '34 EM', 'K125AA', ‘225Ru’, '17-37', 'Fercal', '1045P)' in Chianti Classico. Both soils were non calcareous. In Chianti Classico the soil was a sandyclay (pH 8.0) while in the 'Morellino di Scansano' area the soil was a clay loam sandy (pH 6.9). This latter area was characterised by warmer and dry conditions during summer. In the 'Morellino di Scansano' area a less vine vigour was induced by 41B’, 'Gravesac’ and ‘SO4’ while ‘779P’, ‘161-49’ and ‘140Ru’ showed to increase plant vigour. The yield was not strictly correlated to vigour. The more productive vines were grafted onto ‘775P’, followed by ‘779P’, ‘101-14’, 110R’, 140Ru’ and ‘K5BB’', while '41B' induced lower berry size and productivity and elevated sugar levels also maintaining good acidity, low pH, medium anthocyanin content of the berry. Berry
sugar accumulation was the highest with ‘101-14’, 420A’ and ‘110R’, and lower with ’K5BB’. The berry anthocyanin and polyphenol richness were positively influenced by ‘SO4’and ‘779P’ and to a lesser extent by ‘’420A’, ‘’101-14, ‘110R’, ‘161-49’ and 140Ru’, while 775P’ ‘K5BB’, ‘Gravesac’, and ‘1103P’ induced lower levels. In the Chianti Classico area '41B’ and ‘420A’ determined low vine vigour, while ‘Rupestris Du Lot’ significantly decreased yield. These results showed non-negligible differences of performances among the various rootstocks according to soil and climatic conditions. The best performances were given by ‘110R’, which was the most homogeneous in both ambient
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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