Question

Discuss the standards of quality for irrigation water.

Answer 1

Permissible limits for classes of irrigation water.

Concentration, total dissolved solids

Classes of water Electrical Gravi metric ppm

conductivity µmhos*

Class 1, Excellent 250 175

Class 2, Good 250-750 175-525

Class 3, Permissible 1 750-2,000 525-1,400

Class 4, Doubtful -2 2,000-3,000 1,400-2,100

Class 5, Unsuitable 2 3,000 2,100 2

*Micro mhos /cm at 25 degrees C. 1

Good drainage needed and sensitive plants will have difficulty obtaining

stands