Fertilisers and PPM

[emmpey]

Any brainiacs out there who can tell me how to work out (roughly) PPM without an EC meter? I don't have the cash to buy one.

I use powdered chem ferts...so for example 25-12-12 is 25% N. 10g of that fert = 2.5g N, dissolved in 2 gallon water = ? PPM.

Or is this is a dumb question? :stoned:

TIA.

[emmpey]

don't worry about it, found this.
http://www.colostate.edu/Depts/HLA/GHEX/newsletter/vol_12/vol_12_no_3.htm#Four

Apologies - I must learn to look first and ask later :)