- Gypsum (calcium sulfate) is used to displace the excess sodium ions from the soil exchange complex. The calcium replaces sodium, which is then leached out of the soil profile as sodium sulfate with irrigation water.
Irrigation over a period of time can contribute to the salinization of some agricultural lands This statement is correct. Irrigation water, especially in arid and semi-arid regions, contains dissolved salts. When water is applied to fields, plants use some water, and much of it evaporates from the soil surface. The dissolved salts, however, are left behind. Without adequate drainage, these salts accumulate in the topsoil over time, leading to salinization, which reduces soil fertility and plant growth. 296. The long term solution of soil salinity and alkalinity is use of:
Asked in RPSC RAS Prelims 1998 · Topic: Pollution (Soil Pollution: Causes, effects (contamination, degradation), remediation techniques.)
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