Les évaluations des bilans en éléments nutritifs aident à déterminer les effets des pratiques agricoles sur la fertilité des sols. Selon les situations, plusieurs approches et méthodes ont été utilisées. Ce bulletin présente un apercu de la situation actuelle des études des bilans en elements nutritifs. Il fait apparaître l'évolution des différentes approches et méthodes, les compare et souligne les améliorations effectuées ainsi que les questions qui restent à résoudre.
Search results
Showing items 1 through 9 of 9.-
Library ResourceJournal Articles & BooksDecember, 2005Angola, Burkina Faso, Bangladesh, Nigeria, Rwanda, Mali, Burundi, Zimbabwe, Eswatini, Ghana, Congo, Sierra Leone, Malawi, Niger, Mozambique, Liberia, Lesotho, Madagascar, Togo, Botswana, Gabon, Kenya
-
Library ResourceJournal Articles & BooksDecember, 2015Kenya, Philippines, Uganda, Mali, Ukraine, Belarus, Australia, Ghana, Congo, South Sudan, Sierra Leone, Sudan, Pakistan, Sri Lanka
Ce double numéro d’Unasylva se propose de sonder les relations complexes existant entre les forêts, les arbres et les catastrophes, et d’examiner comment il est possible de gérer au mieux les forêts et les arbres à la fois pour résister aux chocs et pour protéger contre les chocs. Les forêts et les arbres peuvent servir de tampons naturels contre les catastrophes et les chocs. Ils ont un rôle déterminant à jouer dans la protection contre les catastrophes et la réduction de leur impact.
-
Library ResourceJournal Articles & BooksDecember, 2016France, Honduras, United States of America, Zambia, Tonga, Ghana, Congo, Sierra Leone, Malawi, Costa Rica, Niger, Palau, Kiribati, Madagascar, Luxembourg, Netherlands, Brazil, Canada
La publication de ce numéro d’Unasylva coïncide avec deux événements marquants pour les forêts. Les 196 Parties à la Convention-cadre des Nations Unies sur les changements climatiques viennent de se réunir à la Conférence Paris climat 2015 en vue de négocier un accord qui soit en mesure de changer la donne en matière de changement climatique. Toujours à Paris, le Global Landscapes Forum 2015, Forum mondial sur les paysages, a été le théâtre de discussions de haut niveau portant sur la recherche et les politiques qui sous-tendent les questions d’utilisation des terres.
-
Library ResourceReports & ResearchDecember, 2016Equatorial Guinea, Benin, Nigeria, Kenya, Zambia, Gambia, Burundi, Guinea-Bissau, Ghana, Congo, Sierra Leone, Ethiopia, Central African Republic, Rwanda, South Africa, Uganda, Gabon, Cameroon, Chad, Togo, Africa
Meeting Name: African Forestry and Wildlife Commission
Meeting symbol/code: FO:AFWC/2016/8.1
Session: Sess. 20 -
Library ResourceReports & ResearchDecember, 2016Kenya, Mauritania, Gambia, Mali, Somalia, Guinea-Bissau, Guinea, Congo, Senegal, Sierra Leone, Ethiopia, Niger, Africa
Meeting Name: African Forestry and Wildlife Commission
Meeting symbol/code: FO:AFWC/2016/10
Session: Sess. 20 -
Library ResourceJournal Articles & BooksDecember, 2003Angola, Burkina Faso, Mozambique, Ghana, Mali, Burundi, Zimbabwe, Eswatini, Canada, Congo, Djibouti, Sierra Leone, Malawi, Niger, Rwanda, Lesotho, Madagascar, Togo, Botswana, Gabon, Kenya, Africa
-
Library ResourceJournal Articles & BooksDecember, 1980Benin, Nigeria, Zambia, Mali, Ghana, Congo, Sierra Leone, Niger, Colombia, Kenya, Liberia, Japan, Cameroon, Chad, Senegal, Sudan, Togo, Côte d'Ivoire, Africa
Policy makers as well as scientists have started to acquire an honest appreciation of the possibilities of reducing the wastage of materials which could be profitably utilized for improving or maintaining soil productivity. In addition, the great opportunities offered by making more efficient use of the potentials of biological nitrogen fixation in farming systems are now fully recognized. A number of recommendations and suggested guidelines were made by the various Working Groups during the two-week Workshop.
-
Library ResourceReports & ResearchDecember, 1969Algeria, France, Rwanda, Canada, Germany, Denmark, Morocco, United Kingdom, Ghana, Sierra Leone, Malawi, Niger, Cameroon, Kenya, Liberia, Uganda, Gabon, Botswana, Senegal, Chad, Togo, Côte d'Ivoire
Meeting Name: African Forestry Commission
Meeting symbol/code: FO-AFC/69/REP.
Session: Sess. 2 -
Library ResourceJournal Articles & BooksDecember, 1984Kenya, France, Nigeria, Philippines, Micronesia, Australia, Ghana, Congo, Guinea, India, Sierra Leone, Ethiopia, Niger, Brazil
Shifting cultivation, under its diverse forms of slash and burn system, is a traditional method of cultivating tropical upland soils, mostly for subsistence purposes. This traditional system of cultivation is in ecological balance with the environment and does not irreversibly degrade the soil resource, provided a sufficient length of fallow is allowed for soil restoration. However, increasing population pressures necessitate more intensive use of land. The consequence is extended cropping periods and shortened fallows.
Land Library Search
Through our robust search engine, you can search for any item of the over 64,800 highly curated resources in the Land Library.
If you would like to find an overview of what is possible, feel free to peruse the Search Guide.