1,721,057 research outputs found
Hydraulic Relations and Water Use of Mediterranean Ornamental Shrubs in Containers
Get PDFA detailed, species-specific comprehension of plant water behavior can be a central tool to improve water management in nursery production and irrigated landscapes. Potted plants of Nerium oleander, Pittosporum tobira, and Ligustrum japonicum ‘Texanum’ were exposed to controlled increasing drought conditions in greenhouse. Water use, gas exchange, and foliar thermoregulation were monitored along the trial. N. oleander showed the most efficient response to increasing water stress, maintaining high levels of gas exchange and evapotranspiration rate during the whole trial, whereas L. japonicum emerged as the most sensitive species, with a significant drop in physiological performances already from the second day. The more aggressive water behavior of N. oleander can be compared to the one of anisohydric plants, whereas L. japonicum displays an isohydric strategy. P. tobira showed intermediate characteristics between the two other species. This work comes to provide useful tools for the management of irrigation in plant nursery and for decision making in the use of ornamental shrubs for landscape applications
Seasonal irrigation volumes and water footprint in a Mediterranean peach orchard
No full textThe water footprint of a product (WFP) has been proposed as indicator for quantifying the impact of production or consumption of goods and a tool to drive consumers' choices. Also it may serve to encourage the efficient use of fresh water. This is highly desirable in agriculture because of its high demand for fresh water, reaching 80% of total use. This study provides an assessment of the total water footprint (WFPtot) and its blue, green and grey components, at the orchard gate of a drip irrigated Mediterranean peach orchard located in southern Italy. The area has dry summers and an average of 590 mm of annual rainfall. The orchard was managed according to conventional (C) (soil tillage, mineral fertilization, empirical irrigation) and innovative (IN) practices (cover crops, recycle of pruning material, compost application and postharvest regulated deficit irrigation). The mean annual irrigation volume was 27.2% higher for C than IN. Six-year field data and ten-year weather data were analyzed through a soil, plant atmosphere computer model (SPASMO) in order to calculate mechanistically WFP (m3 t-1) as the amount of the annual water consumption (m3) per unit of yield (t). Total water footprint was 46.5% higher for C than IN. The blue component of the water footprint (WFPblue) was the dominant component, accounting for ~70% of the WFPtotal in both treatments. Possible use of WFP analysis within a certification scheme as marketing tool is discussed
Dairy effluent management: what is needed to implement a Decision Support System for the phyto-treatment of wastewaters
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
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