Reading PPM/EC - Scales and Measurements
- Thread starter Lagged
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Hollatchaboy
Well-Known Member
I use. 7 scale and I believe I heard somewhere that's the scale that's used in America. Not sure of the validity of that tho. Ime, I just picked a scale and got comfortable with it. The conversions are easy so if someone gives you a reading from a different scale, just do the conversion for the scale you pick.
guitarguy10
Well-Known Member
You should use EC (Electrical Conductivity) as that is the actual physical characteristic being measured and it's units are mS/m (microsiemens/meter).
The picture I've attached, however, will provide you with all of the conversions.
You can read all about the *science* behind it here: https://en.wikipedia.org/wiki/Total_dissolved_solids#Measurement
The picture I've attached, however, will provide you with all of the conversions.
You can read all about the *science* behind it here: https://en.wikipedia.org/wiki/Total_dissolved_solids#Measurement
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Hollatchaboy
Well-Known Member
Good read man!
Lagged
Well-Known Member
Thanks for the reply guys, and yes a great read indeed.
What is suggested ppm or EC for our lovely little ladies? I just did a 2.6 EC feeding based off of a couple of things I've read online but want to get your opinions here.
Hollatchaboy
Well-Known Member
Depends on a few variables. Some will tell you that's too high, some will say it's too low. Personally I would start a lil low, and let your ladies tell you what they want.
guitarguy10
Well-Known Member
People will tell you all sorts of things, IMO that is crazy high that is like deadly high, unless that's the value using tap water and after calmag addition etc.
I try to stick to the manufacturers recomendation and then just increase/decrease according to what my plants tell me, but there are some good Calculators out there for this sort of thing like this one from Canna:
www.cannagardening.com
Contrary to popular forum belief WATER is more important to your plants then their Fertilizer and a lot of people go way harder then they need to (with nutrient makers grinning ear to ear as they take your money).
I try to stick to the manufacturers recomendation and then just increase/decrease according to what my plants tell me, but there are some good Calculators out there for this sort of thing like this one from Canna:
Grow guide | CANNA Gardening USA
Contrary to popular forum belief WATER is more important to your plants then their Fertilizer and a lot of people go way harder then they need to (with nutrient makers grinning ear to ear as they take your money).
Lagged
Well-Known Member
Yeah that was after adding bloom and calmag lolPeople will tell you all sorts of things, IMO that is crazy high that is like deadly high, unless that's the value using tap water and after calmag addition etc.
I try to stick to the manufacturers recomendation and then just increase/decrease according to what my plants tell me, but there are some good Calculators out there for this sort of thing like this one from Canna:
Grow guide | CANNA Gardening USA
Contrary to popular forum belief WATER is more important to your plants then their Fertilizer and a lot of people go way harder then they need to (with nutrient makers grinning ear to ear as they take your money).
Hollatchaboy
Well-Known Member
I use Lucas formula. My ec or ppms run pretty high but I've never had a problem. When I try to lower it my ladies get PISSED! LolPeople will tell you all sorts of things, IMO that is crazy high that is like deadly high, unless that's the value using tap water and after calmag addition etc.
I try to stick to the manufacturers recomendation and then just increase/decrease according to what my plants tell me, but there are some good Calculators out there for this sort of thing like this one from Canna:
Grow guide | CANNA Gardening USA
Contrary to popular forum belief WATER is more important to your plants then their Fertilizer and a lot of people go way harder then they need to (with nutrient makers grinning ear to ear as they take your money).
guitarguy10
Well-Known Member
What medium do you use? In coco I have found it can be very easy to burn plants with even approaching EC 2.2.