Homebrewer, perhaps you can answer a basic question (or anyone else with knowledge). How do you calculate NPK ratios when mixing ferts? Does an equal portion of a 3-1-2 mixed with a 1-3-2 yield a 4-4-4 mix or a 2-2-2 mix?I tested DG against the GH 3 part plus about 4 additives but the principle is still the same. Conni is a 2 part and when mixed it results in roughly a 1-1-2 ratio (http://www.advancednutrients.com/hydroponics/products/connoisseur/connoisseur_faq_nutrient_facts.php) which is not idea for flowering. To get the ideal ratio of 1-3-2, you need to add one of their products that supplies more P and they designed it like that on purpose so you need to buy more bottles. There is absolutely no reason they couldn't have given a better starting NPK in their base meaning you can spend less and grow better plants. On top of the lack luster NPK ratio, they only supply 7 of the 16 essential elements so what exactly is $150 for base nutes getting you?
In regards to GH, their resulting NPK ratio when I use them is roughly a 1-2-2 in flower and they supply 10 of 16 elements, not too bad for their price.
I'm not saying one brand is the end-all-be-all of nute brands but I am saying that NPK ratios and micro nutrient content is what growers should look for, not a brand name or a fancy label.
Yes, that's basically the idea unless one of the parts is substantially less potent than the other. That's where it gets complicated but a simple 'average' of the NPKs gives you a good enough idea.Homebrewer, perhaps you can answer a basic question (or anyone else with knowledge). How do you calculate NPK ratios when mixing ferts? Does an equal portion of a 3-1-2 mixed with a 1-3-2 yield a 4-4-4 mix or a 2-2-2 mix?
Yes, that's basically the idea unless one of the parts is substantially less potent than the other. That's where it gets complicated but a simple 'average' of the NPKs gives you a good enough idea.
Take AB for example. Part A is 4.0-0-2.0 and part B is 1.25-3.7-7.4 roughly resulting in a 5.25 - 3.7 - 9.4, not my idea NPK but it'll certainly work.
What do you mean 'substantially less potent'? Is that the amount of ammoniac vs nitrate? Or that one mix might be 10-0-0 and the other 1-1-1? Is the 1-1-1 more potent because it has a proper ratio of nutrients allowing for more efficient uptake of them? Or is the 10-10-0 more potent because it has such a high nitrogen analysis?Yes, that's basically the idea unless one of the parts is substantially less potent than the other. That's where it gets complicated but a simple 'average' of the NPKs gives you a good enough idea.
Ok, so for this AB homebrew nutrient at 5.25 - 3.7 - 9.4, so that means 5.25 ppm of N right? So if I want to get to the 1-3-2 ratio I have to find a way of getting 12.05 ppm of P and 1.1 ppm of K into my AB nutrient, correct?Take AB for example. Part A is 4.0-0-2.0 and part B is 1.25-3.7-7.4 roughly resulting in a 5.25 - 3.7 - 9.4, not my idea NPK but it'll certainly work.
Multiple NPK-type additives can make final NPK ratios kind of confusing because they are never as potent as base nutes. What I mean by potent has nothing to do with the NPK rating, but more of their ppm/EC contribution. For instance, DG grow is 50% more potent than DG bloom, so when I want a 50/50 split, I use 1.5 parts bloom and 1 part grow. The resulting NPK ratio is the 'average' of the two (roughly estimating) because these base nutes are exactly the same except for their NPK content.So do the same rules apply when you add additives or is only for base nutrients?
The numbers on the front of the bottle have nothing to do with their ppm/EC contribution. A 20-20-20 is the same as a 1-1-1 and just because they used the number 20 doesn't mean it's a better value than 1-1-1.Ok, so for this AB homebrew nutrient at 5.25 - 3.7 - 9.4, so that means 5.25 ppm of N right? So if I want to get to the 1-3-2 ratio I have to find a way of getting 12.05 ppm of P and 1.1 ppm of K into my AB nutrient, correct?
That is pretty much the sum of this thread. I'm very glad I stumbled onto this thread. It has opened my eyes to the MJ market and nutrients.I think the take away should be to minimize the number of NPK additives you use and start with better ratios out of your base.
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With the base nutes being 200 ppm per ml per gal of water, can I use the ratio's of NPK to determine the ppm's of each? If not, how would I?Multiple NPK-type additives can make final NPK ratios kind of confusing because they are never as potent as base nutes. What I mean by potent has nothing to do with the NPK rating, but more of their ppm/EC contribution. For instance, DG grow is 50% more potent than DG bloom, so when I want a 50/50 split, I use 1.5 parts bloom and 1 part grow. The resulting NPK ratio is the 'average' of the two (roughly estimating) because these base nutes are exactly the same except for their NPK content.
So if you're base nutes are contributing 200ppm per ml into a gallon of water and your 'booster' is only contributing 35ppm per ml into a gallon, you can't exactly 'average' them with a mix of 1:1.
I think the take away should be to minimize the number of NPK additives you use and start with better ratios out of your base.
Isn't the 20-20-20 just 20x the concentration of 1-1-1?The numbers on the front of the bottle have nothing to do with their ppm/EC contribution. A 20-20-20 is the same as a 1-1-1 and just because they used the number 20 doesn't mean it's a better value than 1-1-1.
In regards to the AB ratios, a 'booster' with the content of 0-10-0 would be great IMO.
This is a good piece of info if you wanted to get that exact about it:With the base nutes being 200 ppm per ml per gal of water, can I use the ratio's of NPK to determine the ppm's of each? If not, how would I?
... but you really don't need to be that exact. Find a brand with a desirable ratio and a solid micro nutrient content and you're set.The factors for converting from P2O5 and K2O values to their respective P and K elemental values are as follows:
- P2O5 consists of 57.4% oxygen and 43.6% elemental phosphorus. The percentage([mass fraction]) of elemental phosphorus is 43.6% so P= 0.43 x P2O5
- K2O consists of 17% oxygen and 83% elemental potassium. The percentage (mass fraction) of elemental potassium is 83% so K = 0.83 x K2O
Using these conversion factors we can determine that an 18−51−20 fertilizer contains by weight:
- Nitrogen values represent actual nitrogen content so these numbers do not need to be converted.
- 18% elemental (N)
- 22% elemental (P), and
- 16% elemental (K)
Supposedly that's sort of how it works but I know of a number of examples where the fertilizer is something like 10-10-10 and the 3-5-4 is more concentrated.Isn't the 20-20-20 just 20x the concentration of 1-1-1?
Thanks homebrewer, I been reading up on some of your grows and they are great threads of solid info, props. I'm working to understand ratio's better perhaps an example would help.This is a good piece of info if you wanted to get that exact about it:
... but you really don't need to be that exact. Find a brand with a desirable ratio and a solid micro nutrient content and you're set.
Is this where the dilution rates are different? If the 3-5-4 is mixed at a tsp/gal and the 10-10-10 is tbs/gal then that makes sense.Supposedly that's sort of how it works but I know of a number of examples where the fertilizer is something like 10-10-10 and the 3-5-4 is more concentrated.
Certain nutrient brands are more pH stable than others. I've also found that high feeding levels (more food than the plants need) is often the culprit for unstable pH.I'm starting the 5th week of flower and was experiencing a lot of pH drift when I would mix up a fresh batch of nutes. I'd have to add pH down twice a day until day 2-3 then the pH would stabilize at the same time as precipitation fell out of solution.
DG also makes a 3-12-6 bloom formula and when mixed with the grow, it's a lot easier to achieve ideal ratios while keeping plants green and healthy until harvest day.Then in coming up with a base nute, I took Dyna-Gro's 7-9-5 and Botanicare's Hydroplex 0-10-6, mixed in equal measure creates a solution that is 7-19-11. This gets me into the ballpark.
I love the attention to detail but in regards to the number crunching above , you just don't need to do it. If your base nutes are slowly creating deficiencies in your plants and you're feeding at appropriate levels, then properly identifying those deficiencies and adding cal/mag or backing off the phosphorus or whatever the solution may be....is your solution. As much as I wish plant health was quantifiable by numbers, it really isn't. Developing that green thumb and being able to read your girls is much more useful than a calculator.Next, I looking to create a ratio of Mg/Ca/N, Mag half of Calcium and Calcium almost equal to Nitrogen (.8 to 1).
Using Sweet (Mg 1.5% , S 2.0%) and Cal-Mag (N 2%, Ca 3.2%, Mg 1.2%, Fe .1%), mixing these together at 1 part Sweet to 2 parts Cal-Mag gets me to a solution that is N 4%, Ca 6.2%, Mg 2.7%, S 2.0%, Fe .1%.
This gets me close to that Mg/Ca/N ratio. (Not quite but closer than not). Ideally having a Cal/Mg source that has no nitrogen would be perfect.
I know that Sweet contributes 104 ppm and Cal-Mag contributes 170 ppm to my test gallon - a total of 274 ppm (in theory). So at the rate of 5ml/gal of each (Sweet and Cal-mag), I know that 1ml Sweet contributes 25 ppm and 1 ml Cal-mag contributes 34 ppm to my test gallon.
Now I'm trying to understand how much of that 34 ppm is Calcium and how much in Magnesium. My goal is to understand if I am supplying my calcium in the 50-200 ppm range.
I recommend a certain brand and people then like to say i'm a broken record or work for the company, . PM me and i'll give you some details.I'm not looking for a solution, more of an understanding on how these things work together. I know that using any nutrient line, will get me roughly the results I want but I'm really looking to dial in my nutrient choices with solid science and not marketing hype.