Ab einem Preisniveau von 2 Euro/kg für industriell hergestellten Stickstoff wird der Leguminosenanbau durch die biologische Stickstofffixierung in der konventionellen Landwirtschaft wirtschaftlich vorteilhaft. Körnermais und teilweise Winterraps können dann von Ackerbohnen aus den Fruchtfolgen verdrängt werden. Dies wurde mittels Linearer Programmierung für einen durchschnittlichen landwirtschaftlichen Betrieb in Sachsen errechnet. Kleearten und Luzerne als Futterpflanzen werden unter diesem Blickwinkel aber erst ab Kosten von 2,30 Euro/kg Industriestickstoff konkurrenzfähig gegenüber Silomais. Letztlich entscheiden vor allem die Preis-Kosten-Relationen von Betriebsmitteln und Agrarerzeugnissen über den Einsatz der biologischen Stickstoffgewinnung. Dazu wurden zwei Szenarien dargestellt. Nicht zu erwarten ist, dass stark steigende Preise für Mineralstickstoffdünger in Zukunft zur vermehrten Umstellung auf ökologischen Landbau führen werden, einem Anbausystem, das sich fast vollständig auf die legume Stickstoffbindung stützt.

In the last few years the demand for organic products has increased rapidly, resulting in a strong growth of the organic industry worldwide. Organic certification is used globally to guarantee that organic labelled producers follow the principles and standards of organic agriculture set by international and national organic certification bodies. Currently the lengthy and complex process of organic certification is entirely paper based, requires organic primary producers to have access to the certifying body, and involves precise data capture and transfer over a long period of time. The paper based organic certification process has some significant disadvantages such as being time-consuming, error-prone (particularly transcription errors) and complex. Any improvement of the paper based organic paper certification process can lead to higher efficiency, lower costs and time savings for primary producers and certifying bodies. / Australia is a major supplier of organic produce, holding almost half of the organic farmland worldwide. However, Australia's unique geography provides challenges due to huge distances and poor rural telecommunication coverage for the sustainable agriculture sector. Up until now there has not been a software solution supporting organic primary producers in their certification process, let alone a mobile software solution. There are many farm management software solutions available but they do not take into account the specific issues in organic agriculture such as soil management, pest control, or fertilisation. / The Mobile Organic Certification (MobiCert) project was created to overcome these disadvantages by focussing on the development of a mobile information portal which can be accessed through mobile Internet using GPRS or 3G technology, thus enabling primary producers to access organic certification related information in the field using their mobile phones. / The results of the proof-of-concept MobiCert project suggest that organic primary producers can benefit from a mobile information platform to access and provide information in rural and remote areas. The benefits and acceptance of the MobiCert solution have to be affirmed in follow-on field studies incorporating other issues such as the underlying business models. / Thesis (PhDInformationTechnology)--University of South Australia, 2007.

The phenomenon of organic agriculture in the Mid North of South Australia is explored in seven case studies of local organic producers. The research issue asks how these organic producers organise to survive in a marketplace where they remain marginal players. The research is framed around Sonnino and Marsden's (2006) two-dimensional model of alternative agriculture, which structures the case study analysis at two levels: a horizontal dimension concerning farmer agency and grassroots innovations, and a vertical dimension focusing on farmer interaction with regulatory and governance frameworks in organic agriculture. To enrich understanding of farmer practices at the grassroots level, two additions are made to the horizontal dimension: the role that beliefs play in determining agency and innovation in motivating farmers to 'go organic' and 'stay organic' and how alternative beliefs, particularly about nature and localism, influence the construction by organic farmers of 'new platforms of action' (Sonnino and Marsden 2006), essential for survival in the marketplace. / PhD Doctorate

Thesis (M. Env. St.)--University of Adelaide, Mawson Graduate Centre for Environmental Studies, 1994? / Includes bibliographical references (leaves 74-84).

Zugl.: Tübingen, Univ., Diss., 2003. - Zsfassung in engl. und portug. Sprache

Thesis (Ph. D.)--University of Oregon, 1999. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 303-318). Also available for download via the World Wide Web; free to University of Oregon users. Address: http://wwwlib.umi.com/cr/uoregon/fullcit?p9948031.

Thesis (Ph. D.)--University of Oregon, 1999. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 303-318). Also available for download via the World Wide Web; free to University of Oregon users. Address: http://wwwlib.umi.com/cr/uoregon/fullcit?p9948031.

Thesis (Ph.D.) - University of KwaZulu-Natal, Pietermaritzburg, 2009. / Full text also available online. Scroll down for electronic link.

Thesis (M.A.)--Miami University, Dept. of Communication, 2006. / Title from first page of PDF document. Includes bibliographical references (p. 48-51).

Thesis (Ph. D.)--Ohio State University, 2005. / Title from first page of PDF file. Document formatted into pages; contains xii, 304 p.; also includes graphics. Includes bibliographical references (p. 253-304). Available online via OhioLINK's ETD Center