There is plenty of lteratur eon this issue , a popular researchable issue these days. You will find plenty of literature on this issue. Silicon is so established in moderating the effect of drought , salinity , salt stress etc . And salinity and drought stress move parallel ....

thank you dear Anoop Kumar Srivastava

I did a lot of search in the articles but did not find much scientific information about the role of silicon and drought stress on EC and soil pH.

Do you Dr Hassan Itesami from Tehran university , he has published a lot on this issue....

Under drought where transpiration exceeds that of absorption of water; means there is very less water status in the plant system to meet transpiration demand thereby wilting occurs..during these conditions, there is higher rate of evaporation from the soil surface unlike transpiration (aerial loss of water) from the plant surface leaving salts over the soil surface resulting in salinity problem because there is no proper water or moisture content in the soil so as to leach down soluble salts in the soil...so under drought conditions, there is higher content of salt left over soil surface thereby higher salinity or higher EC value of the soil..

Anoop Kumar Srivastava Yes, he is one of my teachers