GrowFAQ:

What does pH mean?

  Added by: MisterIto  Last edited by: administrator  Viewed: 143 times  Rated by 8 users: 7.20/10
The degree of acidity/alkalinity of a solution is identified on the ph scale of 0 to 14, with a pH of 7 representing the neutral point. The pH scale is logarithmic, meaning small changes in pH represent large changes in the degree of acidity or alkalinity. For example, a solution with a pH of 5 is ten times as acidic as a solution with a pH of 6, but a solution with a pH of 5 is 100 times as acidic as a solution with a pH of 7. The pH of the nutrient solution is a major determinant of nutrient uptake by the plant.
  Last modified: 10:33 - Nov 15, 2000 

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