Gypsum immediately decreases the pH of sodic soils or near sodic soils from values often over 9 but usually over 8 to values of from 7.5 to 7.8. These values are in the range of acceptability for growth of most crop plants. Probably more than one mechanism is involved. Ca++ reacts with bicarbonate to precipitate CaCO3 and release protons which decrease the pH. Also, the level of exchangeable sodium is decreased which lessens the hydrolysis of clay to form hydroxides. These reactions can decrease the incidence of lime and bicarbonate induced iron deficiency. [SUB](3)[/SUB]
sounds about right... salt neutralizer being acidic, lime being alkali, they'd neutralize each other.. :RpS_blink:
still, cements got lime in it.. then i went for a google for 'gypsum ph' and found this...
from USA Gypsum - Agricultural Gypsum and Gypsum Fertilizer
so i havent reaaallly learned anything except maybe its actually good for the garden to dig a little hole and tip your wash out in it... provided its clay soil... :RpS_bored: