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Agricultural productivity --- Biological productivity --- Agriculture --- Biology, Economic --- 631.155 --- landbouw --- energie --- landbouwgewassen --- 631.155 Farm production control. Goals and quotas. Crop supplies, losses and surplusses. Subsidies --- Farm production control. Goals and quotas. Crop supplies, losses and surplusses. Subsidies --- Economic biology --- Farming --- Husbandry --- Biological production rate --- Productivity, Biological --- Productivity, Agricultural --- Pests --- Industrial arts --- Life sciences --- Food supply --- Land use, Rural --- Ecology --- Farm management --- Economic aspects --- Agricultural productivity. --- Agriculture. --- Biological productivity. --- Biology, Economic. --- Productivité biologique --- Biologie économique --- Productivité