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ENVIRONMENTAL SCIENCE!

With this model we will see how the pH level of the soil will affect plants.Plants thrive best
in a pH range of 5.8 - 6.5 soil pH. PH above 6.5 will cause plants to show a deficiency of
micronutrients. Aluminum sulfate and sulfur is used to lower the pH level while poultry manure,
wood ashes and lime is used to raise the pH level.

Definition of soil pH:

pH is defined as the negative logarithm of the hydrogen ion (H+) concentration. When water
ionizes to H+ and OH- (a neutral solution), both H+ and OH- ions are in equal concentrations
of 0.0000001 moles per liter. HOH <---> H+ + OH- [H+] = [OH-] = 1 x 10-7 moles/liter.
The H+ ion and OH- concentrations in water are very small. The pH scale has been devised
for conveniently expressing these small concentrations by expressing pH = Log 1/[H+]