Subjects: *Crop yields; *Farms; *Carbon in soilsChina
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Subjects: CARBON cycle; CROP yields; RESTORATION ecologyCHINA
Subjects: CROP yields; HARVESTING; AIR pollution controlCHINA
Subjects: *Synthetic fertilizers; *Fertilizers; *Acid soilsChina
Subjects: CONSERVATION tillage; NO-tillage; CROP yieldsCHINA
Subjects: CROP residues; AGRICULTURAL productivity; FARMSCHINA
Subjects: SOIL amendments; CROP yields; HISTOSOLSCHINA
Subjects: CLIMATOLOGY; AGRICULTURE; PROFIT marginsCHILE; CHINA
Subjects: *Agricultural productivity; *Soil productivity; *Crop yieldsNorth China Plain (China); China
Subjects: *Crop yields; *Crops; *Cropping systemsChina