1. Agro-environmental Payments, and Support to Organic Farming. For improving environmental sustainability of farms most important are: Green Payments, Support to Organic Farming, Obligatory Standards, Norms, Rules and Restrictions, and Agro-environmental Payments. On the other hand, public instruments with the least impact on eco-sustainability of Bulgarian farms at the current stage of development are: Support to Setting up Micro-enterprises, Setting up Produces Organizations, Support to Semi-market Farms, Diversification to Non-agricultural Activities, Support to Young Farmers, and Restoration and Development of Residential Areas. There is differentiation of impacts of individual instruments of public policies on sustainability of farms of different type and location. Mechanisms and instruments of national and European policies, which to the greatest extent affect improvement of sustainability of Bulgarian farms are: Obligatory Standards, Norms;Bulgarian farms is relatively smallest. Instruments, which augment social sustainability of most farms are: Strategies for Local Development,2000
2. South-West (88,%) and South-Central (84,21%) regions of the country; National Tops Ups for Products, Livestock, etc. in regard to economic sustainability of Companies (82.35%), holdings Predominately for Subsistence (76.47%), and those specialized in Grazing Livestock (80%), mainly in Mountainous Regions (88,46%) and with Lands in Protected Zones and Territories (76,92%), and located in North-Central (74,36%) and South-West (72%) regions of the country; Green Payments for economic sustainability of enterprises located in Mountainous Regions, and with Lands in Protected Zones and Territories;Direct Area Based Payments for economic sustainability of Sole Traders (87.50%), Cooperatives (84.62%), Companies (82.35%), holdings with Small size for the sector (81.52%), enterprise specialized in Pigs, Poultry and Rabbits (100%)
3. Companies (76,47%), and specialized in Mix Livestock (71,43%) and Mix Crops (70,37%), and located in Mountainous Regions (76,92%), and North-Central (76,92%) and South-Central (71,05%) regions of the country; Support to Semi-market Farms and Setting up Produces Organizations for economic sustainability of holdings Predominately for Subsistence (accordingly 76,47% and 70,59%); Natural Handicap Payments to Farmers in Mountain Areas for economic sustainability of farming enterprises;Modernization of Agricultural Holdings in relations to economic sustainability of Sole Traders (87,5%)
4. Farm sustainability evaluation: methodology and practice;M Andreoli;Ecosystems & Environment,2000