1,720,974 research outputs found
Organic and mineral fertilization for processing tomato in Southern Italy
No full textA four-year field experiment to evaluate the effects of different types of organic fertilizers on yield and quality of processing tomato and on soil chemical evolution, was carried out in Southern Italy during the 2002-2005 period on a silty-clay soil. The fertilization treatments aimed to supply 100 kg ha-1of N and were: 1) an organic biological fertilizer (BIO); 2) an experimental compost composed by olive residues, sludge and straw (COMP); 3) a mix (MIX) of an organic fertilizer (50%) and ammonium nitrate (50%); 4) a traditional chemical fertilizer (ammonium nitrate, MIN). At harvest the main productive and qualitative parameters were assessed (fresh and dried yield; biomass and marketable yield). Chemical analyses of the soil were made at the start and at the end of experiment. Fruit yield did not differ among the fertilization treatments, but unripe fruit yield was higher in the MIN and BIO treatment; MIN showed also smaller fruit than BIO and COMP. The N availability during crop cycle influenced the mean fruit weight, date, and simultaneity of maturity during the ripening process. Soil characteristics changed during the four years of application for mineral N and among treatments (P 2O5 for BIO and COMP and mineral N for MIN and MIX fertilization treatments). Heavy metals: cupper and zinc did not increase their concentration in the soil; instead, lead increased below the Italian law's limit in COMP. The possibility to use organic fertilizer for processing tomatoes has been evaluated and the conclusions are that organic fertilization is, in same cases, more suitable than mineral one from a productive and soil fertility standpoint of view
Effect of compost organic amendments on chemical composition and in vitro digestibility of alfalfa (Medicago sativa L.)
No full textBioactivators and nitrogen fertilization applied to durum wheat: Effects on the chemical composition and in vitro digestibility of straw.
No full textEffects of compost organic amendments on chemical composition and in vitro digestibility of alfalfa (Medicago sativa L.)
No full textThe following fertiliser treatments were compared during the years 2002 and 2003 on alfalfa forage (Medicago
sativa L.): compost obtained from the organic fraction of the Municipal Solid Waste (MSW); olive
pomace compost (OPC); mineral fertiliser (Min). All the treatments allowed a distribution of 75kg ha-1 of
P2O5. Three cuttings occurred: at 168, 206 and 351 days after compost application (DAA) in 2002; 119,
152 and 320 DAA in 2003. Cumulative biomass and dry matter yields were measured during each experimental
year. Furthermore, chemical composition and in vitro digestibility of dry matter (DMd), organic
matter (OMd), crude protein (CPd) and NDF (NDFd) were determined. MSW treatment showed a significantly
(P<0.01) higher content of ADL than OPC and Min (77.0, 66.0 and 65.0g kg-1 DM, respectively).
Fertiliser treatments also affected (P<0.01) digestibility parameters. In fact, DMd and OMd values showed
the same trend with lower percentages in MSW treatment than in the OPC and Min ones. The NDFd differed
in all treatments having the highest value in OPC (40.1%). The results indicated that the soil distribution
of organic materials offer the possibility to reduce the application of mineral fertilisers and production
costs without decreasing alfalfa yield, forage chemical composition and in vitro digestibility
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
Bioactivators and nitrogen fertilization applied to durum wheat: Effects on the chemical composition and in vitro digestibility of straw
No full textVariations 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
- …
