A contrast experiment in field and a
rhizosphere experiment in greenhouse wereconducted to study ion transPort in soil-crop
rhizosphere system under differentconditions. Salts of irrigation water were accumulated in the surface layer of soilunder fallow conditions, but in the root zone of soil under cropping conditions. Cl-,SO2-4 Na+, Ca2+ and Mg2+, were accumlated in the
rhizosphere of wheat in theProcess of irrigtion with mineralized water, but K+ was depleted in the rhizosphere.The differences of ion
concentrations of soil solution betWeen rhizosphere andnonrhizosphere became larger with the growth of wheat. The accumulation anddepleted of ions in rhizosphere related to the uptake amount and rate of ions by crop.Cl-, SO2-4, Na+, Ca2+ and Mg2+ concentrations of soil solution in rhizosphere andnonrhizosphere decreased with the increase of leaching water volume. The descendingrates of ion concentrations in soil solution of rhizosphere were obviously lower thanthose of nonrhizosphere. More Cl- than SO2-4 was leached out both in rhizosphere andin n6nrhizosphere.