liquid food ppm?

[samizook]

Please help me understand to make sure i'm on the right track. I purchased some liquid 10-15-10 fertilizer. I will be shooting for a total ppm of 150. To achieve this, I measured out 100 drops equaling one teaspoon.The recomended dosage on the container is 28 drops Gal. Does this sound like too much food?

[gixrj18]

You will never know your parts per million (ppm) without using a TDS meter......or a rocket scientist. Each one of those drops is a concentrated amount. Therefore, each drop has a certain ppm, not just one part per drop. I feed mine at about 1300 ppm, and then flush them a little. Most fertilizers' recommended dosage is about half that, so your safe to go a little over the recommended dosage (as long as you flush), but I wouldn't go 150 drops. This will more than likely be a very lethal dose.

[camille1585]

You may find Ray's fertilizer calculator helpful. Ray recommends shooting for 125ppm N at each watering. Scroll down the bottom of the page, type in the N value of your fertilizer (10) and your target ppm N (125), I did it for you, and it's a bit less than 1 teaspoon of fertilizer, so what you're feeding now is good.
This calculator is great and I use it all the time now, as it has taken the guesswork out of feeding! Personally, I measure my liquid fertilizers with a syringe since french teaspoons are not exactly the same size as american ones.

Fertilizer ppm calculator

[samizook]

[QUOTE=gixrj18;83297]You will never know your parts per million (ppm) without using a TDS meter......or a rocket scientist. Each one of those drops is a concentrated amount. Therefore, each drop has a certain ppm, not just one part per drop.
I agree. I do feel that the liquid is going to be more accurate than the powder that i was using. How soon after feeding are you flushing? And what technique are you using? Thanks for the info.

Camille, thanks for looking into it for me. I did find Rays ppm calculator useful. I was concerned after finding out 100 drops/Gal = 150ppm. It seemed high to me being a newb that I am.

[gixrj18]

I feed, then hose 'em down 5-10 minutes later. In the summer, I water at mid week, also.....but it's hot here in Florida.