1,720,974 research outputs found
Phosphorus fertilization, soil phosphorus availability and grain yield of durum wheat (Triticum durum Desf.) and maize (Zea mays L.) under no-tillage and reduced tillage conditions
Full text linkIl corpo della tesi comprende tre manoscritti basati su ricerche svolte durante il periodo di dottorato: Il primo capitolo è una systematic review dal titolo: “Phosphorus fertilization and soil phosphorus availability in no-tillage systems: a systematic review with a focus on wheat crops”. Lo studio mira ad ampliare la nostra comprensione del comportamento del fosforo in condizione di non lavorazione, per massimizzare la sua efficienza d'uso e diminuire le sue perdite ambientali. I dati mostrano: (i) una crescente tendenza delle pubblicazioni negli ultimi anni con una distribuzione non omogenea di casi studio; (ii) gli studi sulla disponibilità di fosforo nel suolo possono produrre incertezze e dati contrastanti, anch'essi fortemente dipendenti dal contesto; (iii) sono necessari studi a lungo termine per caratterizzare pienamente la dinamica del fosforo su frumento in condizioni di non lavorazione del terreno; (iv) è necessaria una giusta calibrazione sito specifica del fertilizzante fosfatico per evitare sovra o sotto fertilizzazione; e (iv) vi è la necessità di indirizzare studi futuri verso forme alternative di fertilizzazione organica. Il secondo capitolo è un manoscritto completo di ricerca dal titolo: “Phosphorus fertilization, soil phosphorus availability and grain yield of durum wheat under no-tillage conditions”. È stato condotto un esperimento di due anni per studiare gli effetti di due diversi fertilizzanti fosfatici (fosfato complessato con acidi umici e perfosfato triplo) in condizioni di non lavorazione su i) disponibilità di fosforo nel suolo, ii) sostanza secca e traslocazione di sostanza secca iii) uso efficiente del fosforo iv) resa in granella e componenti del grano duro. Il terzo capitolo è un manoscritto dal titolo: “Phosphorus fertilization, soil phosphorus availability and grain yield of maize under reduced tillage conditions”. Gli obiettivi di questa ricerca sono i) valutare la disponibilità di fosforo nel suolo conferita dai diversi tassi di fertilizzazione attraverso due diversi tipi di fertilizzanti, ii) studiare l'architettura delle piante e iii) valutare le differenze nella resa di grano per identificare il miglior quantitativo e la migliore tipologia di fertilizzante, per garantire un'elevata produzione e una migliore sostenibilità.The body of the thesis includes three manuscripts based on researches carried out during the period of PhD: The first chapter is a Systematic Review entitled: “Phosphorus fertilization and soil phosphorus availability in no-tillage systems: a systematic review with a focus on wheat crops”. The review aims to enlarge our understanding of phosphorus behavior in no-tillage systems, to maximize its use efficiency and diminish its environmental losses, with a focus on wheat crops. The data show: (i) an increasing trend of publications over recent years with a non-homogenous distribution of case studies; (ii) studies on soil phosphorus availability in no-tillage wheat systems can produce uncertainties and contrasting data, which are also strongly context dependent; (iii) long-term studies are necessary to fully characterize phosphorus dynamics in no-tillage wheat systems; (iv) site-specific calibration of phosphorus fertilization is necessary to avoid over- or under-fertilization; and (iv) there is the need for future studies to be directed toward alternative forms of organic fertilization. The second chapter is a full research manuscript entitled: “Phosphorus fertilization, soil phosphorus availability and grain yield of durum wheat under no-tillage conditions”. A two year experiment was carried out to investigate the effects of two different phosphorus fertilizers (humic-complexed phosphate and triple superphosphate) under Mediterranean and no-tillage conditions on i) soil phosphorus availability, ii) dry matter and dry matter translocation iii) phosphorus use efficiency and iv) grain yield and grain components of durum wheat. The third chapter is a full research manuscript entitled: “Phosphorus fertilization, soil phosphorus availability and grain yield of maize under reduced tillage conditions”. The objectives of this research are i) evaluate the soil phosphorus availability conferred by different fertilizer rates under two different type of fertilizers, ii) study the plants architecture and iii) evaluate the differences in grain yield to identify the best rate and type of phosphorus fertilizer, to ensure high production and a better sustainability
Physical activity as a drug for the development of personality in the growing age: literature review / Attività motoria come farmaco per lo sviluppo della personalità in età evolutiva: revisione della letteratura
No full textPhysical activity is an essential element in the growing age. Today, we are in the center of an hurricane caused by an international crisis that affects not only economics and politics of the Nations, but also cultural and ethical development of the citizens. The adoption of active and healthy lifestyles is particularly affected by this picture and, in turn, it affects the motor skills and the physical self-concept of the children in the growing age. Moreover, physical activity and sport – beyond to be insufficient in terms of weekly hours – usually are performed with only one goal in mind: the score. The studies included in the present review highlight that educating toward and active lifestyle since early years hood may positively influence all the aspects of the personality and help in structuring cognitive, social and ethical competenc
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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