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In another topik we talked about relations between pH and fertilizer. I bought a pH meter and did some measurements.
Rain water I use is EC= 25-40 uS/cm, pH = 6,85.
Fertilizer solution with Peters Excel CalMag when EC= 500 uS/cm, pH drops to 3,6!!!! It means that every plus 100 uS decrease the pH level cca. with 0,62 !!!
I added 1/3 part tap water to this solution( hardness is 22 nK here), pH increased to 6,2. ( this concentration of fertinizer, what i used before, pure rain water with Peters, 300 uS)
Conclusions:
Peters decreases pH significantly, i used 300uS solution with rain water, pH was cca. 5.0 then, not optimal.
As Brabantia mentioned before, better way to buffer this solution with tapwater.
Rain water I use is EC= 25-40 uS/cm, pH = 6,85.
Fertilizer solution with Peters Excel CalMag when EC= 500 uS/cm, pH drops to 3,6!!!! It means that every plus 100 uS decrease the pH level cca. with 0,62 !!!
I added 1/3 part tap water to this solution( hardness is 22 nK here), pH increased to 6,2. ( this concentration of fertinizer, what i used before, pure rain water with Peters, 300 uS)
Conclusions:
Peters decreases pH significantly, i used 300uS solution with rain water, pH was cca. 5.0 then, not optimal.
As Brabantia mentioned before, better way to buffer this solution with tapwater.
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