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Weeds --- fallow --- Cultivation --- soil fertility --- Belgium
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fallow --- Green manures --- experimentation. --- experimentation --- Productivity --- Crop rotation --- soil fertility --- costs --- Choice of species --- Analyse
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Cereals --- Cultivation --- nitrogen fertilizers --- Fertilizer application --- Variety trials --- Weed control --- plant growth substances --- Disease control --- Research policies --- History --- Belgium
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Cereals --- Cultivation --- nitrogen fertilizers --- Fertilizer application --- Variety trials --- Weed control --- plant growth substances --- Disease control --- Research policies --- History --- Belgium
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