How to Calculate NPK ratio!

Talking hydro recirculating dip system, dutch pot.
Lets add first aditives, in my room they are. voodoo, sensizym,big bug, nirvana. lets stay for a day, each one when it is need (voodoo first 3 weeks, big bug 4-6 weeks, sensi all weeks ,etc), then adjust Ph. 5.9 goes nice, and 0.1 more every week. 6----6.1----6.2----6.3 this is by block iron and nitrogen uptake, and no nitro nor iron at the end.
Many plant likes 6-6.5 even at hydro systems. start veg at 5.5-5.8 for nitro uptake and P-K block.
next day mix nutrients , im just enjoy my own mix, lucas formula with soft and hard water.
hard micro 2-0-0, hard bloom 1-3-4
soft micro 5-0-1, soft bloom 0-5-4
liquid big bud 0-1-3 also with BB powder 1 week each one

soft makes 5-5-5 perfect for veg
hard makes 3-3-4 and a new world for NPK ratios. mixing it at desired ratios like.
40 big bud + 25 hard bloom + 10 soft micro makes 25-38-77 ----5 N- 7.6 P- 15 K ,near a 5 week blooming, with desired 1:3 N to K and 1:2 P to K.

How to mix correctly. fill 1/3 RESERVOIR plain water. fill a soda or similar bottle 2 liters at 3/4 of plain water add ONE aditive, mix the bottle and add to reservoir. then next aditive, then 3rd aditive......Ph correct
next day add FIRST micro same way, mix it into a bottle then add to res, stir the mix tank ,take the botlle, mix bloom, add and stir mixture.
Now you have all ingredients into res. Ph adjust, FILL plain water to the EC you wish. Ph another time now and a few hours later. First hours and after the pump recirculates makes the mayor changes with the Ph. when correct Ph mix with a syringe and a glass at lest 1:50 acid with water, do not add acid directly it will precipite all that it touch, nutrients in fact, add water to a glass and then add syringe the few mililiters of acid with half glass.
take numbers on a paper to remember for the next week
You have the right NPK ratio at the correct concentration of nutrient, plenty of aditives with the Ph you wish to have. now use that for the next 7-15 days your budget can afford, this is important thing, voodoo and other aditives makes a 25 galon tank worth in my country "una pasta gansa" in other countrys as far as 15 dollars. Tomatoes cant afford that ,only cannabis and few more plants can, even at sunlight.
the best NPK numbers are those that goes well in your plants, look for deficency, use halo-harpin or similar, alwayts stay at lower nutrients scale, flush every week with 1/3 strengh of previsously ween (look EC meter) and many tricks more
DESPITE ADVANCED NUTRIENTS CALCULATOR, you will burn the dessert with taht ratios

Originally Posted by mccumcumber

Have you heard of weighted percents? It's very simple math so it shouldn't be too hard to explain.
Lets take a basic class as an example.
You have a paper worth 30% of your grade, a final worth 50% and a midterm worth 20%.
You get 100/100 on your paper, a 70/100 and a 80/100 on your midterm.
Without using weighted averages you would add up 100+70+80= 250 and divide by 3 = 83.3. This is wrong. What you should do is:
100*.30 (30 percent)=30, 70*.50 (50 percent)= 35, and 80*.20(20 percent) = 16. 30+35+16= 81.

Now, lets apply this to NPK raitios, you have:
Bloom(least amount)4ml, 0-5-4
Grow(least amount)4ml, 1-1-6
Micro(least amount)4ml, 4-0-0
B52(least amount)2ml, 2-1-4

This is relatively easy since almost everything is the same amount. You have 14ml total. So, to find percentages you need to divide the amount of you nutes by 14. Your two different amounts are 4 and 2, so this is relatively easy.
4/14 ~ 28.5%
2/14 ~ 14.5% (the decimals go on forever so I just rounded)
Now, you multiply your values by their respective percentages, in this case, .285 gets multiplied by bloom grow and micro, and .145 gets multiplied by b-52.
0-5-4 * .285 = 0-1.425-1.14
1-1-6 * .285 = .285-.285-1.71
4-0-0 * .285 = 1.14-0-0
2-1-4 * .145 = 0.29-.145-.58
Now, add up all the values.
N = .285 + 1.14 + .29 = 1.715
P = 1.425 + .285 + .145 = 1.855
K = 1.14 + 1.71 + .58 = 3.43

So, at 14ml your NPK ratio is 1.715-1.855-3.43, or rounding you get 1.7-1.8-3.4

Basically the way you did it was correct, I just wanted you to know why.

Thanks man. Wikipedia of NPK and your post told me what I've been looking for EXACTLY for a week now.

You can make this as difficult and confusing as you want, which is the Advanced Shysters MO. It's never enough, or you can go down to Walmart and pick up a Vigoro 24-8-18 for veg and a 1-3-2 for bloom and be done with it. You may need a tad of Mg in those.

To make things easier I advise folks to follow a 3-1-2 ratio to support good foliage output and a 1-3-2 to support good bloom. Dyna-Gro Foliage Pro and their bloom food fit that bill, all in one bottle, not 4.

Bud production depends on how healthy and massive the foliage is maintained until harvest. Learn to read your plants and get off the AN charts and advice. In the real world, it usually doesn't work. May I suggest you get educated on plant nutrition and what makes a plant tick?

Let's say you have a teaspoon each of a 9-3-6 and 1-3-2. If you added them together to get 2 teaspoons then divide by 2 (parts), you have a NPK value of 5-3-4, which would make a great all around food from start to finish at a general rate of 1 tsp/gallon.

Tio

Originally Posted by mccumcumber

Now, lets apply this to NPK raitios, you have:
[B][B]Bloom(least amount)4ml, 0-5-4
Grow(least amount)4ml, 1-1-6
Micro(least amount)4ml, 4-0-0
B52(least amount)2ml, 2-1-4

That would add up to:

6-6.5-12. Divide by 4 (if you choose to use 4 ml of food) and you get pretty close to: 1.5-1.5-3......... which is too low in N and too high in K for proper foliage support (and perhaps bloom support as leaves produce the bud, not salts), at least for most soils. But, they (cannabis specific food hawkers) all do it, and noobs will have to learn the hard way, at least until they educate themselves.

i know this was said already, but sometimes it helps me if i hear it another way yet... N-P-K ratios are by weight...so for example...Fox Farm Grow Big is 6-4-4 is 946mL and weighs 2lbs. the 6 is 6% of the 2lbs., not the 946 volume...so as long as it is the same weight and volume (which most fert companies do this anyways for simplicity and this exact same problem), you can just add the numbers together to get your NPK ratio.

I read this somewhere... If they only require so little, why do we feed them so much? It's worth stating for the record the actual ratios of N, P and K that cannabis requires through it's life cycle: Vegetative Stage N - P - K 3 - 1 - 2 Flowering Stage N - P - K 1 - 1 - 2 Final Flowering Stage N - P - K 0 - 1 - 2 To translate this into a 12 week schedule for a typical Skunk type such as Cheese or Psychosis would give something along these lines: Veg week 1: 3 - 1 - 2 Veg week 2: 3 - 1 - 2 Flo week 1 : 3 - 1 - 2 Flo week 2 : 3 - 1 - 2 Flo week 3 : 1 - 1 - 2 Flo week 4 : 1 - 1 - 2 Flo week 5 : 1 - 1 - 2 Flo week 6 : 1 - 1 - 2 Flo week 7 : 0 - 1 - 2 Flo week 8 : 0 - 1 - 2 Flo week 9 : 0 - 0 - 0 Flo week 10: 0 - 0 - 0

Sorry, damn site ain't working right so there are no spaces

I thought the space thing was just from my phone! Lol. Mine wouldnt space either... i try to read everyday an see how much food they should eat. I feel like i could add more food every week and not see a physical difference in the plant itself. Now on i try to stay on low nute feedings just to be safe.