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Nitrogen in agriculture --- Nitrogen --- Nitrogen-fixing plants --- Cropping systems --- Sustainable agriculture --- Fixation --- -Cropping systems --- -Nitrogen --- -Nitrogen in agriculture --- -Nitrogen-fixing plants --- -Sustainable agriculture --- -631.151.6 --- 631.461.5 --- Low-input agriculture --- Low-input sustainable agriculture --- Lower input agriculture --- Resource-efficient agriculture --- Sustainable farming --- Agriculture --- Alternative agriculture --- Plants, Nitrogen-fixing --- Biofertilizers --- Plants --- Crops and nitrogen --- Group 15 elements --- Nonmetals --- Agricultural systems --- Soil management --- Integrated farm production systems. Sustainable agriculture --- Nitrogen-fixing bacteria. Nitrogen fixation --- 631.461.5 Nitrogen-fixing bacteria. Nitrogen fixation --- 631.151.6 Integrated farm production systems. Sustainable agriculture --- 631.151.6 --- Nitrogen in agriculture - Tropics - Congresses --- Nitrogen in agriculture - Africa - Congresses --- Nitrogen - Fixation - Congresses --- Nitrogen-fixing plants - Tropics - Congresses --- Nitrogen-fixing plants - Africa - Congresses --- Cropping systems - Tropics - Congresses --- Cropping systems - Africa - Congresses --- Sustainable agriculture - Tropics - Congresses --- Sustainable agriculture - Africa - Congresses