1,720,984 research outputs found
Changes in physico-chemical and biochemical parameters of soil following addition of wood ash: A field experiment
No full textHere we have investigated the effects of the addition of two different wood ash sizes at two different doses (5 and 20 t/ha) on the physicochemical, microbiological and biochemical properties in the surface soil (0–30 cm) of an Italian agricultural system. Over 24 months, the pH, electrical conductivity, soil microbial biomass-C and -N, and total hydrolytic activity were periodically tested, together with alkaline phosphatase, arylsulphatase and o-diphenoloxidase activities. Analysis of variance (ANOVA) was performed to consider the effects of sampling time and wood
ash addition on the parameters tested and to reveal possible interactions between the two variables. For electrical conductivity, pH, soil microbial biomass-C and total hydrolytic activity the ANOVA showed a significant ‘wood ash type× sampling time’ interaction, while no interaction was found for the other enzymatic activities. Significant increases in pH and in electrical conductivity were seen over the first months in all of the treated samples, which were more pronounced at the higher dose. Decreases in microbial biomass-C and changes in the microbial C/N ratios were
seen for all of the treatments, which were more pronounced at the higher dose. Increases in soil microbial activity were seen over the first 8 months. The alkaline phosphatase and arylsulphatase activities were significantly inhibited for the first 4 months of soil treatment. The significant increases seen in o-diphenoloxidase activity over the first 8 months under all of the treatments appear to be related to the increases in electrical conductivity. After 12 months, the levels of all of the parameters tested in the treated soils returned to the levels of the untreated soils indicating that the disposal of up to 20 t/ha of wood ash per year in Italian agricultural soil does not result in long-term changes in any of these parameters
Biochemical parameter changes in urban waste compost used as biofilter for pesticides decontamination. International
No full textEffectiveness of microbial indexes in discriminating interactive effects of tillage and crop rotation in a vertic ustorthens
No full textCoffee by-products derived resources. A review
Full text linkCoffee is the most common beverage and there are two main different methods to process coffee cherries. Coffee husk is the main by-product of coffee processing by dry method and is available in large quantities throughout the years, but its main application has been limited to animal feeding or energy production. Most of the coffee husk is disposed in landfills or arable land, usually with no care of its fate and changes to the source of pollution, especially in developing countries. Coffee husk can have several re-uses, but it is important to have environment-friendly methods to change it into useable material or material to be recycled in nature because of its important content of organic matter, chemical nutrients, and secondary compounds. The aim of this review is to recollect the amounts and uses of the coffee industry by-products, giving emphasis to its transformation into compost because of their large content of nutrients and the need to introduce high valuable organics into the soil
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
Impiego di urea stabilizzata con 3,4-dimetilpirazolo fosfato in un terreno di risaia: II. Influenza sull’assorbimento di N nitrico in stadi fenologici significativi
No full textIn a 2-year lysimeter experiment, the effect of urea-N in the presence of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on the yield and nitrate uptake of flooded and nonflooded rice was examined in comparison with N-fertilized and unfertilized plots. Results show that although DMPP doesn’t increase either the dry matter at different stages of development or the mean grain yield, it may improve grain quality reducing markedly NO3-N concentration. The positive effect of DMPP on grain quality was evident in both irrigation systems but it was especially pronounced in flooded conditions where PO4-P content significantly increase
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
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