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soils(9)
carbon(7)
agriculture(5)
biomass(3)
air quality(2)
ammonia(2)
atmosphere(2)
carbon dioxide(2)
conservation(2)
forests(2)
irrigation(2)
landscape(2)
organic matter(2)
population(2)
precipitation(2)
sediments(2)
wetlands(2)
calcium(1)
carbonate(1)
conductivity(1)
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