Soil Fertility and Nutrient management (1+1)

Soil salinity classes and crop growth

Sl. No	Soil salinity class	EC(e).dSm-1	Effect on crop growth
1.	Non saline	<2	Salinity effects negligible
2.	Slightly saline	2- 4	Yields of sensitive crops may be restricted.
3.	Moderately saline	4 - 8	Yield of many crops restricted.
4.	Strongly saline	8 - 16	Only tolerant crops yield satisfactory.
5.	Very strongly saline	>16	Only a few very tolerant crops yield is satisfactory.

Equations for relating EC with OP and TDS Conversions
Total cations (m eq/L)=10 X EC(dS/m) at 25oC
Salt Concentration(mg/L)= 640 X EC(dS/m) at 25oC
Osmotic Pressure= 0.36 X EC (dS/m) at 25oC
% Salt in solution= 0.064 X EC (dS/m) at 25oC X Saturation percentage(SP)                                                                                               
                                                                                                      100