Agriculture is coming under more and more pressure to justify its use of the world's freshwater resources and to improve its productive and environmental performance. The allocations of raw water to agriculture (and the allocations within the agriculture sector) all need to be negotiated in a transparent way. This report reviews the large set of literature on the subject and makes the case for the adoption of a functional approach to water valuation as a basis for such negotiation.

Revista internacional de silvicultura e industrias forestales

The present issue of Forest Genetic Resources (FGR) goes to press immediately following the Eleventh World Forestry Congress held in Turkey 13-22 October 1997, which more than 4000 colleagues from 145 countries attended. In regard to the conservation and use of forest genetic resources, the Congress, in its deliberations and report, stressed that action to conserve, manage, sustainably utilize and enhance forest genetic resources is an urgent priority.

Un análisis del estado actual de las plantaciones forestales y las tendencias actuales de las mismas tanto a nivel global como a escala regional. Se examinan tanto los aspectos económicos, como los políticos relacionados al desarrollo de las plantaciones forestales. Luego se presentan las perspectivas de las plantaciones forestales a través de panoramas alternativos de acuerdo al futuro crecimiento de las áreas con plantaciones.

Drainage of agricultural land is one of the most critical water management tools for the sustainability of productive cropping systems, as frequently this sustainability is extremely dependent on the control of waterlogging and soil salinization in the rootzone of most crops. On some agricultural lands, the natural drainage is sufficient to maintain high productivity. However, many others require improvements in surface and subsurface drainage in order to optimize land productivity, while maintaining the quality of soil resources.