PPM

Parts per million is how we measure the amount of fertilizer (salts) thats in the water solution. You will need a ppm meter to read this. I have a $50 one and also a $300 one that reads ph and ec. Basically start out cheap and when a few crops start rolling in then buy the big baller stuff.
Unless you can afford it up front unlike most of us.

I try to keep my seedlings and clones at about 100-250 ppms. After about 10 days I bump up the ppm to around 500-600 ppm for the next 2-3 weeks. After about a month I raise it to 800-1000 ppm. When I start to bud I am at around 1000 and start taking it up slowly to no more than 1500 ppm. I don't suggest going past 1300 till you have a couple crops down.

If you over fertilize your leaves will start to burn. If you see this you will need to flush immediately. Just use pure water and basically drown the plant. Four times the amount of grow medium should be fine. One other thing. If I use tap water it usually has a ppm of 250 in my area. I pretty much add 250 to whatever I'm shooting for. So for a 1000 ppm my meter will read 1250. I will get into waters later.

After the hairs on my buds get 1/4 red I stop feeding the plant nutrients and just give them pure water. This will allow the plant to use up the nutrients it already has and makes the smoke taste a lot smoother with out all the chemical taste.

These are my ppm and ph meters.


Over fertilized.