The progress achieved by CIAT's cassava program through training activities related to the crop in Latin America, Asia, and Oceania are given. In collaboration with the training office at the Centro Internacional de Agricultura Tropical, the cassava program in 1980 trained 38 professionals from 15 countries (Brazil, Colombia, Mexico, Bolivia, USA, Thailand, Dominican Republic, S. Africa, Ecuador, Haiti, Honduras, W. Germany, the Netherlands, Great Britain, and Italy).

The progress achieved by CIAT's cassava program through training activities related to the crop in Latin America, Asia, and Oceania are given. In collaboration with the training office at the Centro Internacional de Agricultura Tropical, the cassava program in 1980 trained 38 professionals from 15 countries (Brazil, Colombia, Mexico, Bolivia, USA, Thailand, Dominican Republic, S. Africa, Ecuador, Haiti, Honduras, W. Germany, the Netherlands, Great Britain, and Italy).

This study is the first to assess land subsidence in the Kathmandu Valley, Nepal. Land subsidence simulations were based on a fully calibrated groundwater (GW) flow model developed using a coupled surface–subsurface modelling system. Subsidence is predicted to occur as a result of deep aquifer compaction due to excessive GW abstraction. The north and north-east areas at the periphery of the GW basin are hotspots for this subsidence. The estimated subsidence is most sensitive to changes in land cover within the recharge areas.

Se describen ensayos destinados a reducir los costos del establecimiento de pasturas y a la observacion de la distribucion espacial de las especies asociadas. Se sembraron Andropogon gayanus, Desmodium ovalifolium, Stylosanthes capitata y Pueraria phaseoloides en una sabana madura o recientemente quemada con o sin labranza y cobertura de rastrojo. D. ovalifolium y P. phaseoloides alcanzaron un cubrimiento completo en ambos tratamientos de labranza, en el ano, con tasas de P2O5 que variaron de media a alta.

Se identificaron deficiencias nutricionales (principalmente de P y algo de K, Mg, Zn y Mo) en Calopogonium mucumoides. Se aplico 0- 240 kg de P205 como superfosfato triple, roca fosforica Araxa o termofosfato/ha, en Andropogon gayanus y stylosanthes capitata al momento de la siembra. El establecimiento delas 2 esoecies fue bueno, pero el crecimiento de S. capitata fue tan lento que cuando se corto la pradera de 15 cm, consistia casi de graminea pura.

Se presentan resultados de la investigacion en produccion y utilizacion de pastos y forrajes que indican que en condiciones relativamente buenas de fertilidad natural y de retencion de humedad de los suelos, representadas por la region del litoral ecuatoriano entre Quevedo y Santo Domingo, es posible obtener aumentos de peso diario en novillos de engorde del orden de 450 g/animal y, con cargas de hasta 3 animales, lograr producciones promedio de carne de hasta 1,5 kg/ha/dia, o sea mas de 500 kg/ha/ano, de modo que los animales alcanzan el peso de mercado antes de los 2,5 anos de edad; tambi

Human land-use practices have been highly variable over the course of the Holocene, a diversity evident in the differentiated effects of human activity on land cover. Historically, agriculture was one of the most significant forms of land use, but even mobile hunter-gatherers transformed land cover through landscape-scale burning (Bliege Bird 2008). Livestock-keeping, plowing, irrigation, and the production of metal, ceramics, and bricks, have also been drivers of historical change.

The use of Earth Observation (EO) provides Contracting Parties to the Ramsar Convention on Wetlands with new approaches to ensure the wise use and conservation of wetlands at the national and global levels. EO has many applications including the inventory, assessment
and monitoring of wetlands. As technology advances, previous limitations of EO will be reduced, and it is anticipated that the use of EO in the management of wetlands will increase. This Ramsar Technical Report aims to provide practitioners with an overview and illustration,

This study is the first to assess land subsidence in the Kathmandu Valley, Nepal. Land subsidence simulations were based on a fully calibrated groundwater (GW) flow model developed using a coupled surface–subsurface modelling system. Subsidence is predicted to occur as a result of deep aquifer compaction due to excessive GW abstraction. The north and north-east areas at the periphery of the GW basin are hotspots for this subsidence. The estimated subsidence is most sensitive to changes in land cover within the recharge areas.

Se describen los resultados obtenidos durante 1981 por la seccion de Microbiologia del Suelo del Programa de Pastos Tropicales del CIAT, cuyos objetivos especificos son: 1) seleccionar leguminosas forrajeras promisorias que no requieren inoculacion; 2) seleccionar cepas de Rhizobium para leguminosas que si necesitan inoculacion; y 3) evaluar el efecto de las tecnicas de inoculacion y practicas de manejo de pastos en la nodulacion y fijacion de N en el campo. Se presentan los resultados de 1) expt.

Groundwater recharge remains almost totally unknown across the Mekong River Basin, hindering the evaluation of groundwater potential for irrigation. A regional regression model was developed to map groundwater recharge across the Lower Mekong Basin where agricultural water demand is increasing, especially during the dry season. The model was calibrated with baseflow computed with the local-minimum flow separation method applied to streamflow recorded in 65 unregulated sub-catchments since 1951.