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During the 4th ESA-Congress, held in the Netherlands, 7-11 July 1996, a new perspective for agronomy emerged. Various contributions demonstrate the need for a new role of agronomy and its tools. In recent decades, agriculture has evolved from an activity with mainly productivity aims, into an issue conciliating environmental, agricultural, and economic and social objectives. Placing agriculture in such a broadened perspective requires a different agronomy, with new tools and approaches at a range of aggregration levels. It calls for detailed knowledge concerning the functioning, productivity a

Agronomy --- Agricultural ecology --- Agricultural resources --- Congresses --- Management --- Resources, Agricultural --- Agriculture --- Natural resources --- Crops --- Soil management --- Agronomy - Congresses --- Agricultural ecology - Congresses --- Agricultural resources - Management - Congresses

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Agricultural ecology --- Agricultural pests --- Agricultural systems --- Organic farming --- Ecologie agricole --- Ennemis des cultures, Lutte biologique contre les --- Systèmes agricoles --- Jardinage biologique --- Congresses --- Biological control --- Congrès --- Integrated agricultural systems --- Congresses. --- Basic Sciences. Agriculture --- Agricultural Systems --- Integrated Production Systems --- Integrated Production Systems. --- Systèmes agricoles --- Congrès --- Agricultural ecology - Congresses. --- Integrated agricultural systems - Congresses. --- Agricultural pests - Biological control - Congresses. --- Organic farming - Congresses.

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Radioisotopes in agriculture --- Congresses --- Radioisotopes in agriculture - Congresses --- Agricultural biotechnology - Congresses --- Agricultural ecology - Congresses --- soil fertility --- Nitrogen --- nitrogen cycle --- plant nutrition --- Plant physiology --- Nitrogen fixation --- cropping systems --- organic matter --- Leaching --- Erosion. --- Erosion --- Desertification. --- Desertification --- Soil pollution --- Soil water balance --- Soil resources --- Resource conservation --- Tracer techniques --- Sustainable agriculture --- Arid zones --- Semiarid zones --- Mediterranean zone --- Agricultural biotechnology --- Agricultural ecology --- Biotechnologie agricole --- Ecologie agricole --- Congresses. --- Congrès --- 504.062 --- 57.088.6 --- 581.1 --- 631.4 --- 631.4 Soil science. Pedology. Soil research --- Soil science. Pedology. Soil research --- 57.088.6 Methods and techniques for studying metabolism and biotransformation.Radioisotopes methods and techniques. --- Methods and techniques for studying metabolism and biotransformation.Radioisotopes methods and techniques. --- 504.062 Protection, rational use, restoration of natural resources. Sustainable development --- Protection, rational use, restoration of natural resources. Sustainable development --- Agriculture