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| Registros recuperados: 1.893 | |
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| Chota, Evelyne. |
| Over the years the Government of Tanzania has recognized the need for modern technology to increase agricultural production. Since the colonial period, agricultural research institutions have been established to cover most of the ecological zones of the country and research had been carried out on major crops by these institutes. However, recently critics have raised the question as to whether this research has been consistent with the needs of the majority of farmers. Closely related to this is the question of how effective the research findings have been communicated to the farmers. These questions have been raised due to the persistently low agricultural productivity and the use of traditional methods of farming, despite all the research that has... |
| Tipo: Thesis or Dissertation |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 1986 |
URL: http://purl.umn.edu/10967 |
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| Throsby, C.D.. |
| This paper traces the perceptions of the agricultural sector held by economists over the last three centuries, with particular emphasis on how the evolution of these ideas has influenced the state of present-day thinking about the economic role of agriculture in developed and developing economies. The paper begins with the seventeenth and eighteenth centuries, leading to a consideration of the place of agriculture in the work of the major figures of classical political economy from Adam Smith to Marx. The rise of neo-classical economics, and its influence on twentieth century thinking, is discussed. In the contemporary period, particular attention is paid to agriculture in development theory, with an assessment of conflicting theoretical ideas about the... |
| Tipo: Journal Article |
Palavras-chave: Teaching/Communication/Extension/Profession. |
| Ano: 1986 |
URL: http://purl.umn.edu/12581 |
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| Lassus, Patrick. |
| Le développement croissant des cultures intensives d'algues unicellulaires marines pour l'aquaculture pose aujourd'hui le problème non seulement de la valeur nutritive de ces organismes mais également des ouvertures possibles vers un marché plus spécialisé en pharmacologie et cosmétologie. En effet, tant au niveau des propriétés étonnantes de certains produits d'excrétions (hydrates de carbone, biotoxines, antibiotiques) que des constituants de base (en particulier lipides et aminoacides) ou des complexes pigmentaires, il semble que peu d'applications semi industrielles aient dépassé l'échelle du laboratoire. Nous avons essayé de faire une synthèse des connaissances dans ce domaine tout en étudiant les quelques tentatives d'utilisation des microalgues à... |
| Tipo: Text |
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| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00139/25038/23147.pdf |
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| ANJOS, J. B. dos. |
| Determinacao de metodos de mecanizacao agricola recomendaveis aos pequenos produtores rurais do semi-arido, testaram-se, pelo terceiro ano consecutivo, varias tecnicas. A ultima foi realizada de janeiro a marco de 1985, atraves de um experimento em nivel de campo, com seis tratamentos, representados pelos diferentes sistemas de mecanizacao agricola e tracao animal. Os seis sistemas de cultivo testados foram: o "plano", o "plano e sulcamento", o "sulco barrado", "sulcamento", "sulcamento barrado", "camalhoes inclinados" e "aracao parcial". o plantio dos quatro primeiros foram feitos com plantadeira-adubadeira SANS montada sobre o policultor 1500 (duas linhas plantadas-adubadas simultaneamente). Nos dois ultimos usou-se a matraca e a adubacao foi manual. |
| Tipo: Separatas |
Palavras-chave: Sequeiro; Dry farming; Power machinery; Agricultura; Mecanização Agrícola; Mechanization; Machinery industry; Agricultural machinery and equipment. |
| Ano: 1986 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/131466 |
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| Bacher, Cedric; Deslous-paoli, Jean-marc; Heral, Maurice; Prou, Jean. |
| The expansion of shellfish culture businesses (oysters, mussels, clams...) gives way to a competition for the use of limited food resources, especially in the Marennes-Oléron basin where water circulation is slow. Increasing the amount of cultivated molluscs leads, from a biological point of view, to:- a drop in growth performances- a rise in chronic mortalities, higher and higher, due to a weakness in the physiological state with a lack of stocks which would have compensated the habitat seasonal shortages (end of winter, etc...)- a greater weakness to diseases, linked to a deficient physiological state and a density rise which increases the proximity rate and thus, parasite propagation speed.For these primary reasons, and for the future of oyster culture,... |
| Tipo: Text |
Palavras-chave: Modélisation; Estimation; Echantillonnage; Mollusques; Marennes Oléron; Evaluation stocks. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/1986/rapport-3841.PDF |
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| Meuriot, Eric; Maucorps, A. |
| Fishing regulations in waters under the responsibility of the EEC mainly concern three techniques of site development: - catch quotas by species and by area (TAC, a word adapted from the English Total Allowable Catch); - the definition of the technical characteristics of the fishing devices used (meshing, type of trawl,...); - setting a minimum commercial size for each species. The regulations of meshing and other constraints relating to the technical characteristics of the fishing devices aim to modify the composition of the catches by age class. The TACs are a technique for controlling the level of exploitation of the stocks. Controlling the fishing effort that they generate is carried out indirectly in the short or mid term. For many years now,... |
| Tipo: Text |
Palavras-chave: SEM. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/1986/rapport-2509.pdf |
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| Registros recuperados: 1.893 | |
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