Haalbaarheid van LED-tussenbelichting bij roos: praktijkonderzoek op Marjoland

Doelstelling van dit onderzoek is een mechanische aanpk van tussenbelichting bij roos, waarbij onderscheid werd gemaakt tussen groeilicht-, stuurlicht- en temperastuureffecten binnen een gewas

Method as border: tuning in to the cacophony of academic backstages of mgration, mobility and border studies

This thematic issue is a collection of articles reflecting on methods as border devices of hierarchical inclusion spanning migration, mobility and border studies. It maps some key concerns and responses emerging from what we call academic backstages of migration, mobility and border research by younger academics. These concerns are around (dis)entangling positions beyond Us/Them (i.e. researcher/researched), delinking from the spectacle of migration and deviating from the categories of migration apparatuses. While these concerns are not new in themselves the articles however situate these broader concerns shaping migration, mobility and border studies within specific contexts, dilemmas, choices, doubts, tactics and unresolved paradoxes of doing fieldwork. The aim of this thematic issue is not to prescribe "best methods" but in fact to make space for un-masking practices of methods as unfinished processes that are politically and ethically charged, while nevertheless shedding light in (re)new(ed) directions urgent for migration, mobility and border studies. Such an ambition is inevitably partial and situated, rather than comprehensive and all-encompassing. The majority of the contributions then enact and suggest different modes of reflexivity, ranging from reflexive inversion, critical complicity, collective self-inquiry, and reflexive ethnography of emotions, while other contributions elaborate shifts in research questions and processes based on failures, and doubts emerging during fieldwork. We invite the readers to then read the contributions against one another as a practice of attuning to what we call a ‘cacophony of academic backstages,’ or in other words, to the ways in which methods are never settled while calling attention to the politics of knowledge production unfolding in everyday fieldwork practices

Methods as Moving Ground: Reflections on the ‘Doings’ of Mobile Methodologies

As mobilities studies became a well-respected field in social science, discussions on mobile research designs followed. Usually, these discussions are part of empirical papers and reveal specific methodological choices of individual researchers, or groups of researchers sharing the same objectives and questions. This article starts with a different approach. It is based on continuous discussions between four researchers who developed their own version of mobility-driven projects, starting from different disciplinary backgrounds and using different research techniques. By sharing and contrasting personal fieldwork experiences, we reflect on the doings of mobile methodologies. We engage with the mistakes, dilemmas, and (dis)comforts that emerge from our own mobile research practices, and discuss what this implies for relations of power between the researcher and the research participants, and to what extent mobile research can represent the mobility that we seek to study. Specifically, the article addresses three questions: 1) To what extent do we produce different knowledge with our mobile methodologies? 2) How do our smooth writings about methodology relate to the ‘messy’ realities in the field? 3) How do our practices articulate and transcend difference between researchers and research participants

Chapter 13 The multi-scalar nature of policy im/mobilities

The widely articulated death of public space in the early 1990s marked the beginning of an extensive interdisciplinary debate on public spaces in general and marketplaces in particular, discussing their social characteristics, political conduct and trends towards privatisation. While these studies describe the context of diversity and mobility as inherently translocal, they, somewhat paradoxically, tend to approach the reigning ‘relations of ruling’ in public spaces as merely local and equate them with municipal agendas of retail reinvestments and commercial gentrification strategies. Yet, as marketplaces come into daily existence through the everyday socio-economic practices of ambulant traders who connect a plurality of places, so are these translocal activities influenced by a multi-scalar web of rules and regulations that go beyond the territorial boundaries of marketplaces. The aim of this chapter is to empirically investigate the linkages among marketplaces, organisations and translocal processes of administration and governance by looking at the effects of the 2006 EU-law “Services in the Internal Market Directive” (2006/123/EC) on the place-making capacities and mobility patterns of traders in the Netherlands. It shows that locally instantiated regulations that affect marketplaces are embedded in multi-faceted institutional webs consisting of supranational, national and local policy levels in which actors compete and collaborate over the production of public space

New directions in exploring the migration industries: introduction to Special Issue

New directions in exploring the migration industries: introduction to Special Issu

Interplant competition as a biasing factor in evaluating pre-treatment effects in cucumber

Schapendonk, A.H.C.M. and Spitters, C.J.T., 1984. Interplant competition as a biasing factor in evaluating pre-treatment effects in cucumber. Scientia Hortic., 24: 115--122. Evaluation of effects of different environmental conditions on plant growth may be seriously biased by interplant competition if treatment plots are not well-bordered. This is shown with an experiment where low- and high-light pre-treated cucumber plants were grown for 6 weeks in a mixture, either in a shaded or in an unshaded glasshouse compartment. In these mixed stands, the high-light pre-treated plants, compared to the low-light pre-treated plants, produced 80 % more leaf area in the shaded compartment and 40 % more leaf area in the unshaded compartment. However, when both pre-treat-ments were not mixed but grown separately, as in grower's practice, the calculated advantage of high-light pre-treatment with respect o leaf area development appeared to be only 15 % (shaded) and 5 % (unshaded). With an explanatory growth model, it is shown that in a mixture, the absolute differ-ence between the components increases in time due to interplant competition, but that the percentage difference remains constant in time and therefore corresponds with the difference in initial status. Deviations from constancy of percentage difference occur in favour of types with a greater plant height or producing a greater leaf area per unit biomass than their competitors