| Abstract: | Water depletion by plants in saline soils leads to the accumulation of salts in the soil in the close vicinity of the roots (= rhizopheric soil). CI?/l. After a period of 4 days water depletion the Cl–contents of 2,5 to 4, s me CI?/ 100 g soil were found in the rhizospheric soil of onions immediately after a water application, when irrigated with water containing 13 to 52 me Cl–content increased in the rhizospheric soil 3-4 fold up to 12 me CI?/100 g soil corresponding to a CI–concentration in the rhizospheric soil solution of 800 me Cl-L The differences between the irrigation treatments were small. The CI–contents of the roots in this experiment varied from 1,2-1,9 me CT/g DM. When expressing the Cl–contents in terms of the cell sap of the roots, CI–concentrations of 1OC-200 me CI?/I cell sap were abtained at a root water content of 90 %. Assuming a decrease in the root water contents to 70 % after a water depletion period of 4 days. CT-concentrations of 500-800 me Cl-ll cell sap are obtained, which corresponded to CI-concentrations determined in the rhizospheric soil solution. |
