What is the permissible limits of cations and anions in irrigation water and soil below which they act as a nutrient but above which they become toxic for the plants
There is classification of irrigation water quality for different purposes .But best course would be evaluate the quality of irrigation water in terms of residual sodium carbonate (Less than 1.5 meq/ L as safe to more than 2.5 meq/L as unsafe depending upon nature of crop) , sodium adsorption ratio ( Less than 8 as safe to more than 18 as unsafe depending upon crios) , chloride concentration (Less than 150- 250 ppm as safe to more than 300ppm as unsafe depending upon nature of crops) ,TDS, EC etc most of these are translated salinity and sodicity induces..
Pl. find enclosed the small write up prepared for training purpose.
Irrigation water contains dissolved salts. These salts are sodium, calcium and magnesium as cations and bicarbonate, carbonate, sulphate and chloride as anions. The quality of irrigation water is judged based on the quantity and proportion of these salts. Various workers have suggested different methods of expression of results of the analysis of irrigation water.
Some of them are Puri's salt index, SAR, adjusted SAR, SSP, ESP , RSC, Permeability Index, Kelly's ratio etc.
Please have a look at these PDFs , probably may give you some clues..all the best..
this depends on type of crops ( tolerance, semi tolerance , sensitive....etc) for this purpose please see ( Ayers and Westcot(1994) Irrigation water quality for Agriculture . FAO., Rome ,Italy -----
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