Subtopic: Irrigation and drainage water quality and reuse
Question Statement:
According to the US Salinity Laboratory classification, irrigation water having an electrical conductivity ($EC$) between $250\text{ to } 750\;\mu\text{S/cm}$ at $25^\circ\text{C}$ is classified as:
Options:
(A) C1 (Low salinity)
(B) C2 (Medium salinity)
(C) C3 (High salinity)
(D) C4 (Very high salinity)
Answer Key:
B
Step-by-Step Solution & Explanation
USSL Salinity Classification:
• C1: Low salinity ($EC < 250\;\mu\text{S/cm}$)
• C2: Medium salinity ($250 - 750\;\mu\text{S/cm}$)
• C3: High salinity ($750 - 2250\;\mu\text{S/cm}$)
• C4: Very high salinity (gt; 2250\;\mu\text{S/cm}$).