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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 311 to 318 of 318 (0.023 seconds)Spelling suggestions: "subject:"[een] ORGANIC FARMING"" "subject:"[enn] ORGANIC FARMING""
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Going Green: The Transnational History of Organic Farming and Green Identity 1900-1975Cahn, Dylan James January 2021 (has links)
No description available.
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| 312 |
Arable Plant Diversity on Gotland, SwedenÖrnberg, Rebecca January 2023 (has links)
Arable plant species diversity has been on a decline, with many species dependent on arable land becoming threatened. At the same time, attempts at defining the drivers of arable plant diversity have proven difficult and results are often contradictory. Much of the available data come from surveys that are small-scale and with great variability in methodology, leading to difficulties comparing them. In this study, I have used survey data from Gotland to examine how arable plant diversity is influenced by management, field size, soil texture and standing crop. I found a negative trend of diversity with increasing field size, and a suggested effect of management and soil texture on the presence of red listed arable plants. This study also evaluates the use of small datasets when examining plant diversity, and the limitations associated with it. It shows that while a small dataset cannot be analysed to the extent a more comprehensive one can, it is possible to identify trends and patterns with it, which may inform further studies.
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| 313 |
Landscape-level heterogeneity of agri-environment measures improves habitat suitability for farmland birdsRoilo, Stephanie, Engler, Jan O., Václavík, Tomáš, Cord, Anna F. 21 May 2024 (has links)
Agri-environment schemes (AESs), ecological focus areas (EFAs), and organic farming are the main tools of the common agricultural policy (CAP) to counteract the dramatic decline of farmland biodiversity in Europe. However, their effectiveness is repeatedly doubted because it seems to vary when measured at the field-versus-landscape level and to depend on the regional environmental and land-use context. Understanding the heterogeneity of their effectiveness is thus crucial to developing management recommendations that maximize their efficacy. Using ensemble species distribution models and spatially explicit field-level information on crops grown, farming practice (organic/conventional), and applied AES/EFA from the Integrated Administration and Control System, we investigated the contributions of five groups of measures (buffer areas, cover crops, extensive grassland management, fallow land, and organic farming) to habitat suitability for 15 farmland bird species in the Mulde River Basin, Germany. We used a multiscale approach to identify the scale of effect of the selected measures. Using simulated land-use scenarios, we further examined how breeding habitat suitability would change if the measures were completely removed and if their adoption by farmers increased to meet conservation-informed targets. Buffer areas, fallow land, and extensive grassland were beneficial measures for most species, but cover crops and organic farming had contrasting effects across species. While different measures acted at different spatial scales, our results highlight the importance of land-use management at the landscape level—at which most measures had the strongest effect. We found that the current level of adoption of the measures delivers only modest gains in breeding habitat suitability. However, habitat suitability improved for the majority of species when the implementation of the measures was increased, suggesting that they could be effective conservation tools if higher adoption levels were reached. The heterogeneity of responses across species and spatial scales indicated that a mix of different measures, applied widely across the agricultural landscape, would likely maximize the benefits for biodiversity. This can only be achieved if the measures in the future CAP will be cooperatively designed in a regionally targeted way to improve their attractiveness for farmers and widen their uptake.
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Farming systems and landscape context: effects on biodiversity and biocontrol / Einfluss von Bewirtschaftungsweise und Landschaftskomplexität auf Biodiversität und biologische SchädlingskontrolleRoschewitz, Indra 19 May 2005 (has links)
No description available.
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| 315 |
Plant communities in organic and conventional agriculture - comparing local, landscape and regional effects / Ackerwildpflanzengesellschaften in ökologischer und konventioneller Landwirtschaft - die Bedeutung von Standort, Landschaft und RegionGabriel, Doreen 03 February 2006 (has links)
No description available.
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| 316 |
Spinnen in Agrarlandschaften und die biologische Kontrolle von Getreideblattläusen / Spiders in agricultural landscapes and the biological control of cereal aphidsSchmidt, Martin H. 27 May 2004 (has links)
No description available.
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| 317 |
Partner satisfaction and renewal likelihood in consumer supported agriculture (CSA) : a case study of The Equiterre CSA networkAchuo, George January 2003 (has links)
No description available.
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| 318 |
Partner satisfaction and renewal likelihood in consumer supported agriculture (CSA) : a case study of The Equiterre CSA networkAchuo, George January 2003 (has links)
No description available.
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