Max 50 micro mole 

sir i want this salt treatment levels for my research. is it OK OR more harmful for rice growth?

To do it you need to specify the water basal conductance as well tretment timing, the type of salt, and cultivar. Ample information is then available from IRRI under the key lesson 4.1 salt tolerance. .

@Guido Bongi thank you so muc. sir i am using NaCl SALT  for two indica and japonica cultivars.

Dear Sajid Hussain

I will suggest you to consult the following books to decide the salinity levels for rice. Generally EC50 is medium values, you should use 2-3 levels above and below this level for rice salinity stress studies in rice.

1. USDA Handbook 60 by L. A. Richards, Editor

2. Water quality for agriculture by Ayers and Wescot, FAO Paper 29.

3. Salt-affected soils: Principals of Management by Ghafoor et al.

@Abdul Ghafoor sir thank you so much for this kind suggestion.

Basically low or lack of salt stress at all for NaCl. Which salt do you add and what is the method to mix it with soil?