Trying to understand hydro nutes.

Posted this in DWC, I probably should have put it here. Sorry Mods.

I feel dumb as a post trying to figure this stuff out. When adding a Grow with 1.19 N, 3.24 P and 6.53 K to a Boost with 3.11 N, 0 P, 2.9 K at 3.5ml Grow and 7ml Boost what would the final NPK be and what would the TDS be at 1 tsp/gl?

Once I get some clue on that I'll have, hopefully, more intelligent questions.

One of the reasons I asked, is because I'm using this calculator: http://www.firstrays.com/fertcalc.htm and trying to reproduce PPM from some information on a couple of bottles of Technaflora B.C. Grow, Bloom and Boost.

According to the label, 3.5ml/l of Grow and 7ml/l of Boost with the values listed above, will give a PPM of 1225. I can't get to that number using those amounts and percentages. I know there will be other ingredients contributing salts but I can't imagine they would be enough to throw my numbers THAT far off.
What am I missing or are there final PPM numbers way off?

yeah they will throw the number THAT far off. NPK are only 3 elements, you got to add the sulfates which add a big number as well as the magnesium calcium and all other trace elements (Fe,B,...) you can look at the label and calculate what ppm contribution of each fert is and know what NPK you got by doing the ratio. will take long time explaining, it's just maths lol

There is a hell of a lot easier way to do it. mix all your nutrients in a gallon pitcher of water and gradually add it to your res that's almost full of water. Take your readings and stop when you get where you want. Then pH to 5.8 check it in an hour and adjust pH if necessary.
In regards to amounts, take the amount the manufacture recommends and divide that by four. Yes, give them 1/4 strength at first. Next res change go half strength. gradually increasing the strength until the tips burn, then back off a bit and thats where you need to be.

Neumann said:

Posted this in DWC, I probably should have put it here. Sorry Mods.

I feel dumb as a post trying to figure this stuff out. When adding a Grow with 1.19 N, 3.24 P and 6.53 K to a Boost with 3.11 N, 0 P, 2.9 K at 3.5ml Grow and 7ml Boost what would the final NPK be and what would the TDS be at 1 tsp/gl?

Once I get some clue on that I'll have, hopefully, more intelligent questions.

One of the reasons I asked, is because I'm using this calculator: http://www.firstrays.com/fertcalc.htm and trying to reproduce PPM from some information on a couple of bottles of Technaflora B.C. Grow, Bloom and Boost.

According to the label, 3.5ml/l of Grow and 7ml/l of Boost with the values listed above, will give a PPM of 1225. I can't get to that number using those amounts and percentages. I know there will be other ingredients contributing salts but I can't imagine they would be enough to throw my numbers THAT far off.
What am I missing or are there final PPM numbers way off?

Click to expand...

1.19 + 2(2.11)N = 5.4
3.24 + 2(0)P = 3.24
6.53 + 2(2.9)K = 12.5

roughly 5-4-12 from some quick napkin math

Thanks to all, I've gotten the nute thing down finally.