Subject: what are the chemicals in soil? What is nitrogen, sulfor , and phosophorus?
Date: Fri Sep 19 12:57:19 2003
Posted by Julia
Grade level: 7-9
School: RMHA - Rocky Mountain Hebrew Academy
City: Denver State/Province: Co
Country: USA
Area of science: Botany
ID: 1063994239.Bt
Message:
What is the history behind hydroponic?
how do you make a hydroponic system?
Re: what are the chemicals in soil? What is nitrogen, sulfor , and phosophorus?
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