Define soil salinity and explain how soil EC relates to salinity management in irrigation.

• A. Soil salinity is the salt concentration in soil; EC measures salinity levels; high EC reduces plant water uptake; management includes leaching, drainage, and using salt-tolerant crops.
• B. Soil salinity is the moisture content of soil; EC measures soil color.
• C. Soil salinity is the level of soil organic matter; EC measures soil texture.
• D. Soil salinity and EC do not interact with irrigation management.

Answer: (A)

Soil salinity is the concentration of soluble salts in the soil, especially in the root zone. Electrical conductivity (EC) is a handy and quick measure of that salt content because dissolved ions carry electric current—the more salts present, the higher the EC. When EC is high, the osmotic potential of soil water drops, making it harder for plants to take up water even if soil moisture looks adequate. This is why monitoring EC is central to salinity management in irrigation: it guides how much leaching to apply, ensures proper drainage, and informs choices about irrigation timing and water quality. If salts accumulate and EC rises, you flush the root zone with more water (leaching), improve drainage to remove salts, or switch to more salt-tolerant crops. The other choices misdefine either soil salinity or EC and don’t reflect how they interact with irrigation planning.