[The ratio of "soil protein" and organic nitrogen as a sanitation index of soils in populated areas].
D009584:Nitrogen; D012499:Sanitation; D012987:Soil
D012987:Soil; D009584:Nitrogen
SANITATION; SOIL
Sootnoshenie "pochvennogo belkovogo" i organicheskogo azota kak sanitarnyi pokazatel' pochv naselennykh mest.