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Soil Salinity
M Yaseen KanjuB.Sc. (Hons)Agriculture7th semesterAgronomy
Soil Salinity
Soil Salinity Increased amount of soluble salt in soil solution
in soil
Soil Salinity Affects: Soil physico-chemical properties Biological soil properties Soil fertility
Soil Salinity
Source of Salinity Primary minerals From deeper soil layers (soil solution)
evaporation > rainfall Irrigation water Coastal soils High doses of chemical fertilizers
Soil Salinity
Determined Ions
Anions – SO42-, Cl-, CO3
2-,NO3-, PO4
3-
Cations – Ca2+, Mg2+, K+, Na+; Al3+, Fe3+
Methods of DeterminationTotal salinity Measurement of electrical resistance Measurement of electrical conductivity
Determination of single ions by titration by advanced methods
Causes Flood
Rainfall
Irrigation water
Weathering
Recalamation
Calcium sulphate
Adding more soil
Adding of organic material
Heavy irrigation