Which statement correctly defines soil EC in relation to salinity?

• A. EC measures soil color.
• B. EC is the salt concentration metric in a soil solution.
• C. EC indicates soil texture.
• D. EC is unrelated to salinity.

Answer: (B)

Electrical conductivity measures how easily electric current moves through a solution, which rises as there are more dissolved salts. In soil, dissolved ions from salts in the soil solution carry charge, so higher salt concentration makes the solution more conductive. That’s why EC is used as a practical indicator of salinity: a higher EC value means higher salinity, which can stress plants by reducing their ability to take up water. EC is not about how soil looks (color) or how big or small its particles are (texture); those properties are different. Saying EC is unrelated to salinity would be false because the whole purpose of measuring EC in soil is to gauge salinity levels.