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grain(6)
maize(6)
monitoring(5)
soil moisture(5)
water use efficiency(5)
biochar(4)
carbon(4)
carbon dioxide(4)
china(4)
cultivated land(4)
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greenhouses(4)
huang-huai-hai plain(4)
manures(4)
meteorology(4)
methane(4)
organic carbon(4)
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spatial and temporal variation(4)
spei(4)
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