I’m doing a science project, on soil management, and i wil be studying the quality of my soil using different amount of water and fertilizer(not including rain). I will section off different parts of my lawn, and use different amounts of water and fertilizer. i’m not yet quite sure wat types of fertilizer, or how many, though. Right now i need sources to cite in my bibliography, but i cant find too many websites besides http://www.wikipedia.org that can help me on this subject. Please help and/or advise.

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basically, we have an assignment and i want to mention what each of these factors indicate regarding to quality of water:
- O.D.
- B.O.D
- Solubility
- Chloride Levels
- Solids found in water
- Titration

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