How to Calculate NPK ratio!

I am very confused on how to properly add up and get the correct NPK values for a plant that will be going into Veg or Flower. I am going to be using advanced nutrients Bloom(1-1-6), Micro(4-0-0), Grow(0-5-4), B-52(2-1-4) for Veg. I want to get the best NPK ratio for veg and the best for flower! But How the heck do you add this up because its so confusing! My last grow I used fox farm and just added nutes in a 1 gallon container and mixed without caring about the NPK ratio and plant was fine all grow. I really want to learn how to add NPK to get the correct ratio I need!
Does anyone know the math Formula too find this answer. ++REP
Bloom(1-1-6)
Micro(4-0-0)
Grow(0-5-4)
B-52(2-1-4)
How to Add>?Looking for best Veg grow and Flower Grow!

No idea but if you add all that i suppose you would get a NPK of 7-7-14 but im probably not right

Not sure if it's correct but I add up the numbers as Serial just did.

Just make absolute sure that you're adding each item in equal parts. In other words if you use a cup of Bloom make you use a cup of each other ingredient you're using.

There is probably a more scientific way to figure this out with fractions but I think this method works as a baseline.

If you add all of this into a mix in these ratios you will have an NPK ratio of:
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

6-6.5-14

So you are basically adding the numbers together but taking into account the % of the product you are using. You are using 50% less of B52 so effectively the ratio to be added is 50% of 2-1-4 which would be 1-0.5-2.

I would say for veg you should aim for your N to be around double the P, and for K to be slightly lower than N. Say a 3-1-2 ratio for simplicity.

Here's another example.

Is only use one product for veg which has a ratio of 5-2-4 NPK (plus MG) For flower I will add PK13/14 for a boost and as an example at top feed would use the following ratio per 10litres of water.

So in top flower feed the ratio is 5ml veg - 1 ml PK13/14 which would equal 5-2-4 + (0-13-14 divided by 5) 0-2.6-2.8 so total new ratio is =
5-4.6-6.8

DST said:

If you add all of this into a mix in these ratios you will have an NPK ratio of:
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

6-6.5-14

So you are basically adding the numbers together but taking into account the % of the product you are using. You are using 50% less of B52 so effectively the ratio to be added is 50% of 2-1-4 which would be 1-0.5-2.

I would say for veg you should aim for your N to be around double the P, and for K to be slightly lower than N. Say a 3-1-2 ratio for simplicity.

Here's another example.

Is only use one product for veg which has a ratio of 5-2-4 NPK (plus MG) For flower I will add PK13/14 for a boost and as an example at top feed would use the following ratio per 10litres of water.

So in top flower feed the ratio is 5ml veg - 1 ml PK13/14 which would equal 5-2-4 + (0-13-14 divided by 5) 0-2.6-2.8 so total new ratio is =
5-4.6-6.8

Click to expand...

So the math I posted above is wrong? Explain!

Oh, I thought I had explained, lol.

NPK ratios are taken by weight/mass. So if you add half the amount of something in, there will be half the weight/mass of that nutrient.

Ok, so lets forget about how much and just use simple quantities.

We assume all quantities are equal:
1 quantity of 0-13-14 added to a mix with 5 quantities of 5-2-4, will give you a new ratio as stated above. = 5 - 4.6 - 6.8

If for example you then change this to
2 quantities of 0-13-14 added to a mix of 5 quantities of 5-2-4 you will get the following work out

5-2-4 + (0-13-14 divided by 2.5 - which is 5 quantities divided by 2 quantities - ) 0-5.2-5.6

= 5 - 7.2 - 9.6

I hope this explains it as it's as simple as I can get it in my mind. And a thanks would be nice

So I send Advanced Nutrients a message and they responded extremely quick with this answer for me!

Here is a relatively simple version of the feeding chart that includes a number of our supplements and additives, while still giving you great results and yields. Let me know if there is anything else I can add or if this is sufficient.

Vegetative growth

We do not recommend applying any nutrients until your plants have developed 3-4 sets of new or true leafs if grown from clones or seedlings. Also, if growing in amended soil, do not apply any nutrients until the plants have used up all the nutrients supplied by the soil. Having said that, here is what we suggest:

Until they develop 3 or 4 sets of new (clones)/true (seedlings) leaves feed them only water. You can foliar spray them with Jumpstart, use application rate suggested on the bottle or 1/4 strength B-52 (1 mL/liter) until then. You can also add 1/4 strength applications of Piranha, Tarantula or Voodoo Juice, to the water that you will use in the root zone.

Clones seedlings need high levels of moisture in the medium
(80% -85% is good 100% is too much)

They also like a warmer environment in the root zone 70 F – 80 F.




Week 1 – 300 ppm: GMB @ 0.5ml/L of each in a 1-1-1 ratio (1.5 ml in total per liter) + Foliar spray B-52 once per week at the 2ml/L application rate.
Week 2 – 600 ppm: GMB @ 1.0ml/L of each in a 1-1-1 ratio + Foliar spray B-52.
Week 3 – 900 ppm: GMB @ 2.0ml/L of Grow, 2.0ml/L Micro and 0.4ml/L Bloom in a 10-10-1 ratio (4.4ml in total per liter) + Voodoo Juice at the rate of 2ml/L + Foliar spray B-52.
Week 4 – 1200 ppm: GMB @ 2.5ml/L of Grow, 2.5ml/L Micro and 0.5ml/L Bloom in a 10-10-1 ratio (5.5ml in total per liter) + Voodoo Juice + Foliar spray B-52.

If it is necessary to veg your plants for a longer period of time then 4 weeks, continue with the 4th week application rates. Apply voodoo juice for up to three week in a row, to properly inoculate the root zone, after which, you can discontinue the application. Also, we recommend growing your plants in veg until they are about 1/3 of their final finish height, since the plants will put on anywhere from 1/2 - 2/3 more vertical growth in the bloom stage. That is, if you want to finish your plants at 6 feet tall, veg until they are 2 foot.

Flower Production Stage

Week 1 – 1000 ppm: GMB @ 1.82 ml/L each in a 1-1-1 ratio (5.46 ml in total per liter) + Voodoo Juice at the rate of 2ml/L
Week 2 – 1200 ppm: GMB @ 2.27 ml/L each in a 1-1-1 ratio+ Voodoo Juice at the rate of 2ml/L + Big Bud @ 2ml/L
Week 3 – 1400 ppm: GMB @ 2.70 ml/L each in a 1-1-1 ratio + Big Bud @ 2ml/L + B52 @ 2ml/L
Week 4 - 1600 ppm: GMB @ 3.33 ml/L each in a 1-1-1 ratio + Big Bud @ 2ml/L + B52 @ 2ml/L
Week 5 – 1400 ppm: GMB @ 2.27 ml/L each in a 1-1-1 ratio + B52 @ 2ml/L + Overdrive @ 2ml
Week 6 – 1200 ppm: GMB @ 1.82 ml/L each in a 1-1-1 ratio + B52 @ 2ml/L + Overdrive @ 2ml
Week 7 – Flush!
If plant needs longer than 6 weeks of feeding (7 week strain, the 7th week is a flush week), repeat week 4 for each extra week.

Overfeeding

If the very tip of the leaves get yellow, it is an early sign of overfeeding. Reduce the solution strength slightly (100 – 150 ppm), if not increase slightly.

Deficiencies

If the margins or any other part of the leaves yellows off it is a possible sign of deficiencies. Check pH in medium and reservoir, if the pH is off from the ideal levels lock out conditions may develop. At first symptom of a deficiency apply rule # 1: “When in doubt flush them out.”
If growing in a medium that takes some time to dry up, allow the medium to dry and feeding them plain pH adjusted water when they are ready, rule #2: “Don’t apply until it’s dry.” If growing in a re circulating system, find a way to give them only pH adjusted water for the length of a light cycle, a second reservoir just for water may be a simple solution, then it is just a matter of moving the pump over, maintain the regular water pump cycle during the flush.

pH conditions in medium

In Soil/Soiless (Soil or Soiless mixtures that may also contain peat moss but not Coco Coir) adjust the pH to 6.3

In Hydro (It includes products such as Rockwool, Hydroton Rock, and Lava Rock) adjust to 5.6

In Coco Coir adjust the ph to 5.8 – 6.0. You may want to supplement with SensiCal when growing in coco with a base nutrient that in not specific to growing in coco

Root damage

Another possibility is damage in the root zone, check for the possibility of root rot, or insect larvae as potential causes for root deterioration, brown, mushy, smelly roots are a good indicator of root damage. Hydrogen peroxide is an efficient way to destroy root rot causing bacteria.

Mixing instructions

When mixing your reservoir, always mix the product that has the highest nitrogen content first (the first number on the NPK rating.) This will more often then not, be your base nutrients. Make sure you properly dissolve each product before mixing the next one into your reservoir. After adding everything into the reservoir, allow the solution to sit for at least 1-2 hours. This will allow the pH to stabilize, making it easier to adjust. Once the pH is stabilized, measure it, and adjust according to the medium you are growing in.

When using a re circulating system, you will be dealing with one of two situations, either the reservoir is large enough to feed the plants for a week without the need to be topped up during the week or it is a small reservoir and in order to feed the plants through the week it will require to be topped up.


In case of reservoir that does not need to be topped up.

Add to the reservoir the amount of water that the plants are going to be using for the week, include some extra water to allow for evaporation.
Mix the nutrient solution at 1/6th of the strength that is suggested in the calculator for that week.
Example: If the plants need 1200 ppm for the week, divide 1200 by 6 and mix the reservoir at 200 – 250 ppm.
Allow the solution to sit long enough to stabilize the pH. Adjust pH
Feed the plants.
Allow the plants to feed on the solution and the pH to rise for 1 1/2 – 2 days before re adjusting the pH.

In case of reservoir that needs to be topped up with water during the week.

Add to reservoir the amount of water that the plants will use in 3 – 3 ½ days.
Mix the nutrient solution at the strength that is suggested in the calculator for that week.
Allow the solution to sit long enough to stabilize the pH. Adjust pH
Feed the plants

Allow the plants to feed on the solution for 1 1/2 – 2 days, top up with water to the original level first before re adjusting the pH, after adding the water allow solution to sit for an hour and re adjust the pH.

If growing in soil adjust the pH 6.3, in coco 5.8 – 6.0, in hydro 5.6.

When using a re circulating system having the pH rise after you start feeding the plants is a good thing, It means that the plants are up taking nutrient, it is important that it rises the plants up take different nutrients at different pH levels, allow the pH to rise for 1 ½ - 2 days at that point adjust the pH down to 5.6 again

http://www.advancednutrients.com/hydroponics/nutrient_calculator_old/

Measurements:

1 gallon = 4 liters (quarts)
1 tsp (teaspoon) = 5 mL
1/2 tsp (teaspoon) = 2.5 mL
1/4 tsp (teaspoon) = 1.25 mL
1 tbsp (tablespoon) = 3 tsp (teaspoon) = 15 mL
We use a 700 ppm/uS/m scale or a 0.7 scale to convert from EC to ppm.

http://en.wikipedia.org/wiki/NPK_rating --->wiki ftw

http://landscaping.about.com/cs/lazylandscaping/g/npk.htm --->same info


--cheers

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.

mccumcumber said:

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.

Click to expand...

So this NPK values all come down too the amount of nutes you use from each bottle. The less from each bottle the lower the NPK and the more the higher NPK? Sounds about right.

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

mccumcumber said:

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.

Click to expand...

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

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.

How about NPK rations when producing seeds? Just like in the flowering phase until seeds are ripe for picking?