id	keyword
agsci-1260	alkali
agsci-1260	leaching
agsci-1260	salt
agsci-1260	saline
agsci-1260	water
agsci-1260	land
agsci-1260	washing
agsci-1260	landscape
agsci-1260	soil
agsci-1260	agricultural
agsci-1260	drainage
agsci-1260	improvement
agsci-1260	irrigation
agsci-1260	system
agsci-1260	cixi
agsci-1260	modern
agsci-1260	rice
agsci-1260	field
agsci-1260	zhengda
agsci-1260	ditches
agsci-1260	freshwater