34 research outputs found

    Communicating the economic and environmental impacts of agroforestry systems

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    Paper presented at the 11th North American Agroforesty Conference, which was held May 31-June 3, 2009 in Columbia, Missouri.In Gold, M.A. and M.M. Hall, eds. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference, Columbia, Mo., May 31-June 3, 2009.The Agriculture and Agri-Food Canada Agroforestry Division conducts research, development and delivers technology tools, products and services including tree and shrub seedlings for the adoption and integration of agroforestry practices by producers. The Division works toward increasing the adoption of agroforestry by demonstrating that agroforestry practices can be both environmentally and economically beneficial if properly integrated as a management practice in the agricultural landscape. To do so, it is important to demonstrate the return on investment for the producer, highlighting private benefits, while also determining opportunities that recognize public benefits. Agricultural practices are constantly changing as producers adopt new technologies and adapt to changing markets, social concerns and changing physical environments. Some producers may no longer consider trees in the agricultural landscape necessary as they rely more on adopted technologies and machinery advancements to impact production and environmental issues traditionally addressed by shelterbelts and tree buffers. As farms become larger and demographics of the farm population change, there is less time and traditional labour for producers to plant and care for trees. Agroforestry specialists and development staff must be cognizant of agricultural trends and keep this in mind when developing agroforestry marketing strategies and programming that is directed at producers. Using the AAFC-PFRA Agroforestry Division's Prairie Shelterbelt Program as an example, this presentation will focus on government & producer investment in agroforestry systems and the economic and environmental impacts of agroforestry systems for the producer and on the agricultural landscape.Laura Poppy (1), Janna Lutz (1), and Henry de Gooijer (1) ; 1. Agriculture and Agri-Food Canada, Agroforestry Division, Indian Head, SK, Canada, S0G 2K0.Includes bibliographical references

    Innovative agroforestry designs : Ecobuffers

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    Paper presented at the 12th North American Agroforesty Conference, which was held June 4-9, 2011 in Athens, Georgia.In Ashton, S. F., S.W. Workman, W.G. Hubbard and D.J. Moorhead, eds. Agroforestry: A Profitable Land Use. Proceedings, 12th North American Agroforestry Conference, Athens, GA, June 4-9, 2011.The predominance of large scale agriculture on the Canadian prairies and the introduction of precision farming technology has led to a noticeable reduction in habitat of marginal lands adjacent to agricultural fields. Removal of existing shelterbelts and a reduction in the number of new shelterbelt plantings is also partially a product of increased field and farm implement size. While improved land management techniques such as zero tillage can help mitigate the negative impact of the loss of shelterbelts, the positive functionality of agroforestry systems cannot be adequately replaced by monocultural farming practices. It is therefore important to target research and development on new agroforestry designs that will fit into modern farming practices. The AAFC Agroforestry Development Centre is conducting research and development on new multi-functional tree planting designs, particularly along field boundaries and riparian zones. The function of the new designs is for multiple purposes including enhancing biodiversity and water quality, conserving soil, biomass production, sequestering carbon and providing economic returns. Three alternative planting designs are being evaluated and demonstrated for their ability to be successfully integrated into current farming systems; ecological buffers (ECOBUFFERS), forest belts and willow buffers. Ecobuffers are a narrow, densely mixed shelterbelt that use native species to mimic natural hedgerows in design and function. Forest Belts are multi species in design, based on traditional plant spacings and willow buffers consist of multiple linear rows of willow cuttings planted in a dense arrangement along riparian areas acting as effective interceptors of nutrients and a source of renewable on farm bio-energy. Only ecobuffers will be addressed in this paper.Bill Schroeder (1), Dan Walker (1), Garth Inouye (1), Laura Poppy (1) and Janna Lutz (1) ; 1. Agriculture and Agri-Food Canada (AAFC), Agroforestry Development Centre, Indian Head, Saskatchewan, Canada.Includes bibliographical references

    Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

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    A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

    Search for single production of vector-like quarks decaying into Wb in pp collisions at s=8\sqrt{s} = 8 TeV with the ATLAS detector

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    ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider

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    Charged-particle distributions at low transverse momentum in s=13\sqrt{s} = 13 TeV pppp interactions measured with the ATLAS detector at the LHC

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    Measurements of top-quark pair differential cross-sections in the eμe\mu channel in pppp collisions at s=13\sqrt{s} = 13 TeV using the ATLAS detector

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    Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in pp collision data at s=8TeV\sqrt{s}=8\,\mathrm TeV{} with the ATLAS detector

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    Measurement of the bbb\overline{b} dijet cross section in pp collisions at s=7\sqrt{s} = 7 TeV with the ATLAS detector

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