Perennial Cereals: A Novel Source of Feed for Grazing Livestock

Initial deployment of perennial cereal crops will likely be as a dual-purpose crop producing forage for livestock as well as grain. This study evaluated the biomass and grain production of 4 wheat × wheatgrass derivative experimental lines under 4 simulated grazing regimes; nil defoliation (D0), defoliate once (D1), defoliate twice (D2) and defoliate twice followed by a simulated hay cut (D3), and compared performance to a winter wheat, cv. EGA Wedgetail, and the perennial grass Thinopyrum intermedium. Increasing defoliation intensity significantly (P \u3c 0.001) lengthened the time to flowering for all lines. All experimental lines produced less biomass in the first year than EGA Wedgetail but more than Th. intermedium in the first spring. Grain yield from Wedgetail was significantly higher (P \u3c 0.001) than all other lines except in the D3 treatment. As defoliation intensity increased, the comparative difference in grain yield between Wedgetail and the experimental entries decreased, with experimental lines OK 7211542 and 11955 exceeding the grain yield of EGA Wedgetail in the D3 treatment. Cumulative biomass production of the experimental lines exceeded that of Wedgetail (P = 0.005), though the distribution of production, across seasons differed markedly. This paper discusses the opportunities perennial cereals may offer as a novel forage source in a mixed-farming context

Summer Dormancy Expression in the Australian Native Grass \u3cem\u3eElymus scaber\u3c/em\u3e

Complete summer dormancy is associated with plant senescence in late spring-summer even though soil moisture is non-limiting. The trait is well understood in exotic temperate grasses for persistence in environments which experience frequent summer droughts (Annicchiarico et al. 2011). However, the trait appears to be uncommon in Australian native grasses (Culvenor 2009). The C3 native perennial grass, Elymus scaber, is broadly adapted across a wide range of climatic zones and soil types in south eastern Australia (Johnston et al. 2001) and has been described as displaying strong summer dormancy (Mitchell et al. 2001). However, the reports of dormancy were not tested under conditions of non-limiting soil moisture. Therefore the dormancy aspect of its growth habit over summer may be confused with drought avoidance, causing leaf senescence in response to drying soil. This study tested the hypothesis that E. scaber exhibits traits consistent with complete summer dormancy, by placing a range of populations of the species under three irrigation regimes (after Norton et al. 2006). For E. scaber to demonstrate complete summer dormancy, it would show no new growth over summer irrespective of the irrigation treatment

Big Data, Big Decisions: Reflections on AIS’s Role in Ethical Guidance and Oversight

This panel will introduce and debate a controversial resolution suggesting that the AIS community should take an active role in developing guidelines for the ethical practice of Big Data and analytics both in academic research and organizational practice. In addition, the resolution proposes that the AIS community should monitor and study the relevant stakeholders’ compliance with these guidelines. The panel will first provide background to the implications of Big Data and analytics based on a recent NSF-funded research agenda setting workshop. The panelists will then comment on potential benefits and potential harms from the perspective of key stakeholder segments: individual citizens, organizations, and society as a whole. The panel will invite the audience to debate the major provocation: What is the appropriate role for the AIS community in ethical leadership on the uses of Big Data and analytics

Yellotas: A Unique Yellow Serradella Cultivar With Potential for Permanent Pasture Environments

Yellow serradella (Ornithopus compressus L.) has been identified as a priority self-regenerating annual legume species for permanent pasture environments in south-eastern Australia. However, most yellow serradella genotypes exhibit high levels of hard seed and slow rates of hard seed breakdown, which reduces regeneration density in the years following the year of sowing . One cultivar, Yellotas, exhibits a much faster rate of hard seed breakdown and has been identified as one of only a handful of cultivars of that species with promising persistence in permanent pasture environments. In addition, this cultivar is substantially easier to de-hull than other cultivars of that species, potentially reducing seed costs. In a field evaluation under severe drought conditions, this cultivar was shown to exhibit a high level of tolerance to close grazing. Yet, doubt still exists as to whether cv. Yellotas produces sufficient residual hard seed to withstand periodic drought suggesting further improvement may be required. This paper details the origins of cultivar and observations of its performance under a range of conditions in south-eastern Australia

The politics of accelerating low-carbon transitions: towards a new research agenda

Meeting the climate change targets in the Paris Agreement implies a substantial and rapid acceleration of low-carbon transitions. Combining insights from political science, policy analysis and socio-technical transition studies, this paper addresses the politics of deliberate acceleration by taking stock of emerging examples, mobilizing relevant theoretical approaches, and articulating a new research agenda. Going beyond routine appeals for more ‘political will’, it organises ideas and examples under three themes: 1) the role of coalitions in supporting and hindering acceleration; 2) the role of feedbacks, through which policies may shape actor preferences which, in turn, create stronger policies; and 3) the role of broader contexts (political economies, institutions, cultural norms, and technical systems) in creating more (or less) favourable conditions for deliberate acceleration. We discuss the importance of each theme, briefly review previous research and articulate new research questions. Our concluding section discusses the current and potential future relationship between transitions theory and political science

Data from a Public–industry Partnership for Enhancing corn Nitrogen Research

Improving corn (Zeamays L.) N managementis pertinent to economic andenvironmental objectives. However, there are limited comprehensive data sources to develop and test N fertilizer decision aid tools across a wide geographic range of soil and weather scenarios. Therefore, a public-industry partnership was formed to conduct standardized corn N rate response field studies throughout the U.S. Midwest. This research was conducted using a standardized protocol at 49 site-years across eight states over the 2014–2016 growing seasons with many soil, plant, and weather related measurements. This note provides the data (found in supplemental files), outlines the data, summarizes key findings, and highlights the strengths and weakness for those who wish to use this dataset

The hydrogen effects on materials program at NIST-Boulder

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