1,354,113 research outputs found
An application of agrometeorology: irrigation water management in maize
No full textIrrimanager is a model for simulation and evaluation of irrigation scheduling. The model performs the soil water balance and it is a multi-modal service because the irrigation advice can be in a internet (web page)or mobile way (txt). This thesis reports on the use and validation of the model using independent data sets relative to meteorological data and phenological observation in order to validate in particular the last information given by the model to help the farmers. Version 1.1 and version 1.2 were used in maize crop in the Veneto Region. Meteorological data's analysis demonstrated at local area the same climate change of the global area and in particular the anomalous trend of the precipitation during the summer season which made the crops more needed of water to avoid the losses caused by stress management. On the other hand the phenological observations, coming from a Network in the Veneto region, were used analyse the answer of the crops to the climate change In fact, starting from these both records available meteorological and phenological data, the validation of was carried out in 2006 and 2007, comparing simulated values of soil moisture and henological stages with the measured ones. The validation of the model was performed also using an arid scenario: maize crop in Victoria, West Australia, in 2007, comparing the output with that ones coming from a similar easy water balance model, created by the Department of Primary Industry of Kyabram. The results showed the good performances of the model in Legnaro in 2006 with both versions and also in Australia, not significant correlation was founded in Legnaro in 2007 with last version. These results support the importance how the agrometeorology science, multidisciplinary science, can play a fundamental role in the modern agricultur
Short-term climate change effects on maize phenological phases in Northeast Italy
No full textThis study evaluates the response of maize growing cycle length to meteorological variables at regional scale particularly, in the short-term period, considering global climate change. The experiment was carried out in Veneto Region (Northeast Italy) where maize phenological data collected by the regional network from 2005 to 2007 were combined with temperature data to analyse the relationship between BBCH stages and thermal sum. The effects of climatic changes in the near and medium term on maize phenology and on water requirements were also evaluated over a grid of climatic data obtained from different climatic models. The piecewise analysis gave the best fitting between BBCH and Growing Degree Days observed data characterized by two lines with different slopes with BBCH 70 (beginning of fruit develop-ment) as changing stage. The angular coefficient of the first line was 2.6 times than the second one (0.028) suggesting that the early stages of the growing cycle are more sensitive to air temperature. The simulation of maize phenology evolution highlights a modest variation at the 2020-time horizon, while an expected reduction of maize growing cycle of about 10 days has been estimated for 2030-time horizon. Long-term phenological observation are desirable to confirm our findings and to improve the strength of dataset
La fenologia per la viticoltura: esempio applicativo nelle varieta Chardonnay e Garganega nei Colli Berici della Regione Veneto nel 2005
No full textEnglish journal title: Italian Journal of AgrometeorologyI Colli Berici sono una formazione collinare, situata nella Regione Veneto e compresa interamente nella provincia di Vicenza, dove la viticoltura è molto diffusa. Il caso studio si riferisce a due varietà, Chardonnay e Garganega, coltivate in tre aziende coinvolte nel progetto di ricerca Aquavitis. Obiettivo di questo lavoro è l’analisi dei rilievi fenologici raccolti durante il primo anno di ricerca e l’interpolazione di questi con i dati meteo, forniti dalle stazioni meteorologiche di proprietà dell’ARPA Veneto. I risultati mostrano come la fenologia, ancora una volta, possa trovare vari campi di applicazione poiché molte tecniche di coltivazione sono strettamente legate allo sviluppo ontogenico vegetale e, come questa disciplina costituisca un valido strumento di supporto agli operatori del settore.A. Bonamano, R. De Bei and M. Borinhttp://www.arpa.veneto.it/temi-ambientali/agrometeo/file-e-allegati/documenti/fenologia/AQUAVITIS%202%20AIAM%202006.pdf/vie
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Analysis of a 49 years long agrometeorological historical data-sets for short term programming and multi-year planning of regional and local irrigation
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Variations on the Author
No full text“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
No full textWe 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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