In countries where the economy relies mostly on agricultural-livestock activities, such as Argentina, droughts cause significant economic losses. Currently, most-used drought indices by Argentinian National Meteorological and Hydrological Services are based field precipitation data, standardized index (SPI) evapotranspiration (SPEI). this article, we explored performance of satellite-based soil...

flowing the uruguay round negotiations (1986-1994), the world trade system has evolved. on the basis of agreements of this round, world trade organization (wto) members have been obligated to decrease tariff obstacles, non-tariff restrains and trade supports. the use of trade liberalizing policies (tariff obstacles and non-tariff restrains) by members and observing countries has had significant...

agriculture has always been considerd as one of the important sectors in domestic and international economy .based on the central bank statistics; agriculture’s share in the iranian gdp at the constant price of the year 1998 was 13 percent of the gdp in the year 2007. therefore, studies on the role of agriculture in an economy and its interactions with other economic sectors should be considere...