utilisation des terres
AGROVOC URI:
Secondary forests in swidden agriculture inthe highlands of Thailand
Swidden farming is the main agent of conversion of primary forests to secondary forests in the highlands of mainland Southeast Asia, but there is a deterioration and decline of the practice with land use intensification. The population growth in northern Thailand has forced lowland farmers practising permanent wet rice cultivation to turn to short rotation swidden in the foot hill zone. Highland swidden agriculturists are adopting more intensive forms of swidden or are shifting to permanent farming.
Sediment-associated organic carbon and nitrogen inputs from erosion and irrigation to rice fields in a mountainous watershed in Northwest Vietnam
Maintaining indigenous nutrient supply and positive nutrient balances are key factors in sustaining rice yields. Irrigation systems act as conveyers for water, sediments and nutrients throughout landscapes, especially in mountainous, cultivated tropical areas where erosivity is usually high. Contributions of erosion and irrigation to the nutrient balance of paddy fields, however, are rarely assessed.
Sistemas de producción agropecuarios sostenibles para los Llanos Orientales y la región Amazónica Colombiana: informe técnico 1995
Sequential phosphorus extraction of a 33P-labeled oxisol under contrasting agricultural systems
Chemical sequential extraction is widely used to divide soil phosphorus (P) into different inorganic (Pi) and organic (Po) fractions, but the assignment of these fractions to pools of differing plant availability, especially for low P tropical soils, is still matter of discussion. To improve this assignment, the effect of land-use systems and related P fertilizer inputs on size of P fractions and their isotopic exchangeability was investigated.
Site selection in Pará : comparisons of Marabá, Paragominas and Santarém
Settlement and land use by Fulani pastoralists in case study areas
Presents results of studies of settlement, land use & relations w. settled farmers of Fulani agropastoralists in Abet & Kachia Grazing Reserve in Subhumid Nigeria. Discusses reasons of choice of site, pattern & right of grazing and access to land.
Site-Specific agriculture: putting data at the service of agriculture
Simulation of costs and benefits of supplementing milking cows with legumes during the dry season in two hillside regions of Nicaragua
Objectives of this study were to compare costs and expected benefits of feed supplementation in cattle with alternative shrub legumes during the dry season using as a case study the hillsides of Central Nicaragua. The information used was gathered in a survey of 32 farms in the states of Boaco and Chontales in Central Nicaragua.
Snapshot of REDD+ in Papua New Guinea
Síntesis de los programas de investigación del CIAT: area de investigación en agrobiodiversidad
Synthesis reports on CIAT's investigations in the area of agrobiodiversity.
Sistema de Información de Suelos de Latinoamérica (SISLAC)
El Sistema de Información de Suelos de Latinoamérica (SISLAC), es una iniciativa regional impulsada y financiada por la Alianza Mundial por el Suelo (FAO) e implementada en alianza estratégica con CIAT, EMBRAPA y 20 instituciones nacionales de Argentina, Bolivia, Brasil, Chile, Colombia, Costa Rica, Cuba, Ecuador, El Salvador, Guatemala, Honduras, México, Nicaragua, Panamá, Paraguay, Perú, República Dominicana, Surinam, Uruguay y Venezuela.