The Grass Doctor

Determining ppm of fertilizer?

This is not solid, but liquid fertilizer. Here's a little of what the 'guaranteed analysis' says: N 10% Fe 0.10% Zn 0.05% etc.. for NPK and micro nutrients. net weight 5.3oz (150g) How would I know what my PPM is after I add some of this solution to water? Say.. I add 14 drops to 1 liter of water. How would I find ppm of the water? I don't need the answer, just how it's done.

Public Comments

1. best bet would be to purchase a (TDS) pen or tester. as water ppm's may fluctuate. you can find them on line or at a local hydroponic supply store.prices vary. personally i only use half the recommended amount of fertilizer, and watch pH like a hawk.