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nitrification(24)
nitrous oxide(8)
denitrification(7)
fertilizers(4)
greenhouse gases(4)
mineralization(4)
nitrogen(4)
agricultural soil science(3)
global change(3)
greenhouse gas (ghg)(3)
maize(3)
ammonia(2)
ammonia emissions(2)
black soil(2)
brachiaria(2)
brazil(2)
cereal crops(2)
china(2)
crop rotation(2)
drought(2)
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