Aggregate stability (dispersion and flocculation) depends on the - - PowerPoint PPT Presentation

Aggregate stability (dispersion and flocculation) d d th b l (SAR) b t (C

2+

d depends on the balance (SAR) between (Ca2+ and Mg2+) and Na+ as well as the amount of soluble salts (EC) in the soil. ( )

+ + +

++ ++ ++ ++ ++

+ + +

++ ++

+

EC

Lower EC Higher EC

Flocculated soil Dispersed soil

Soil particles will flocculate if concentrations f (C

2+ + M 2+)

i d l ti t th

• f (Ca2+ + Mg2+) are increased relative to the

concentration of Na+ (SAR is decreased).

EC

Dispersed Flocculated soil soil

Soil particles will disperse if concentrations of (Ca2+ + Mg2+) are concentrations of (Ca Mg ) are decreased relative to the concentration

• f Na+ (SAR is increased).

Flocculated

EC

Flocculated soil Dispersed soil

Soil particles will flocculate if the amount of soluble salts in the soil amount of soluble salts in the soil is increased (increased EC), even if there is a lot of sodium.

EC

Lower EC Higher EC

Flocculated soil Dispersed soil soil