Give me an oppinion about this fertilizer

[rbarata]

Thank you for the advises.
There was a missing value needed to simplify this issue: fertilizer density.

The package says 400 grs and the dosage 1/2 gr/l.
But how much is 1/2 gr? I don't have a scale and want something easier than having to calculate solution concentrations, molecular weights, molarities, etc, etc.

For those who use this fertilizer, check the bottom of the plastic box. In my case, it says 375 ml. So, 400 grs of fertilizer in a 375 ml box => approx. 1 gr/ml.
Now I can use a spoon, doesn't matter which.

In my country, a teaspoon has 5 ml and a coffee spoon, 2,5 ml.
So, 0,5 gr/l is 0,5 ml/l of water, or easier, a coffee spoon for 5 l of water.

Note this density takes in accout the air spaces between the granulated so it's even better.

Now, about the N ppm... 0,5 gr/l is 1,9 gr/US Gallon which is a almost full coffee spoon. Using Rays TDS calculator, using 0,5 teaspoon per gallon, it gives me 86 ppm N (in reality it's 0,45 teaspoon per gallon, hence 77 ppm N).

This is the confirmation of Rays sugestion and, allso, the recommended dosage in the box: 0,5 gr/l.

Now, a very important question...why my target value of 75 ppm N?

[Ray]

Plants need a very little amount of food, but they need SOME. In nature,they see maybe 15-25 ppm TDS, but get that frequently. We feed less frequently, so. need to increase it. Exactly how much, nobody knows for sure, so we guess and observe, changing as needed.
I view 75 ppm N as a reasonable guess for feeding every 7-10 days.


Ray Barkalow (via Tapatalk)