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Operations research --- System theory --- Operations research. --- Research --- Portugal.

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production biosystems --- automation --- water and soil technologies --- energy --- food production --- environment --- Biological systems --- Agricultural systems --- Agricultural industries --- Land use --- Soil biochemistry --- Aquatic ecology --- Sewage --- Purification --- Aquatic biology --- Ecology --- Biochemistry --- Soil chemistry --- Agribusiness --- Industries --- Farming systems --- Systems, Agricultural --- Systems, Farming --- Agricultural geography --- Farm management --- Biosystems --- Systems, Biological --- Biology --- System theory --- Systems biology --- Philosophy --- Soil biochemistry. --- Land use. --- Biological systems. --- Aquatic ecology. --- Agricultural systems. --- Agricultural industries. --- Purification. --- Land --- Land utilization --- Use of land --- Utilization of land --- Economics --- Land cover --- Landscape assessment --- NIMBY syndrome --- Effluent treatment --- Purification of sewage --- Sewage treatment --- Water treatment --- Disinfection