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We know little to what extent peer feedback strategies can be applied on a large scale in higher education for complex tasks. This study aimed to design, implement, and evaluate an online-supported peer feedback module for large-scale use to enhance higher education students' argumentative essay writing performance. To do this, 330 students from five different courses at bachelor and master levels followed the online supported peer feedback module. In this module, students were asked to write an argumentative essay about a controversial issue, provide peer feedback for two peers, and revise their original essays based on the received feedback. Three types of data including original essay (pre-test) data, peer feedback data, and revised essay (post-test) data collected. Students also filled out the learning satisfaction questionnaire at the end of the module. The findings showed that the suggested online-supported peer feedback module was effective in improving students' argumentative essay quality in all courses at the bachelor and master levels. The findings also showed there is a difference in the level of students' satisfaction with the module among the courses and between the education levels. The findings of this study provide insights into and add value to the scalability of online peer feedback tools for argumentative essay writing in different contexts. Based on the findings, recommendations for future studies and educational practice are provided.

While soil biota play an essential role in ecosystem services, the plant-pathogenic fraction may have a large, negative economic impact on food and feed production. For decades, the use of so-called fumigants (=general biocides) has been a common practice for controlling soil pathogens, including plant-parasitic nematodes. Due to their adverse environmental impact, many fumigants have been banned. Biofumigation - a possible alternative - encompasses the incorporation of mulched Brassicaceous debris into topsoil, and its mode of action is based on the conversion of glucosinolates (GSLs) into nematicidal isothiocyanates (ITCs). Contrary to the relatively well-characterized impact of biofumigation on plant-parasitic nematodes, the effects on the non-parasitic part of the community is largely unknown. We investigated the field effects of biofumigation with four Indian mustard (Brassica juncea) cultivars on both plant-parasitic and free-living nematodes. Prior to biofumigation, GSL contents of B. juncea were determined, and from this, the expected ITC concentrations in the topsoil were calculated. As positive controls, two concentrations of 2-propenyl ITC - corresponding to the average expected ITC concentration, and two times the concentration predicted for the highest producer - were directly applied to wheat (=non Brassica control) plots. Although biofumigation resulted in significant changes for most nematode taxa, none of these shifts could be attributed to the release of ITCs. Moreover, none of the two directly applied ITC concentrations resulted in effects on the nematode community distinct from the water control. We therefore conclude that the observed changes in nematode assemblages are related to intense mechanical disturbance, green manure and the absence of host plants for obligatory plant-parasitic nematodes, rather than to the release of ITCs. [ABSTRACT FROM AUTHOR]