paperchaser825
Active member
How do you go about measuring .5ppm? weigh the B and just measure your res very carefully?
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The myth, of the high P myth?
- Thread starter epicseeds
- Start date
How do you go about measuring .5ppm? weigh the B and just measure your res very carefully?
Get yourself the HydroBuddy software. Its free, and then make a stock solution. I use .923grams/gallon for my SS. Then measure out 38ml/gallon after that for .5ppm B in my fert solution.
I think that Ionic is listed in w/v isn't it? If it is then you do not need an SG. SG is for products listed in w/w.
Hydrobuddy is the shit.
I do mix up alot of my own nutes, but the base is GH 3 Part Flora series at 5/5/3. Spurr suggested 5/5/7, but I wanted to reduce P levels during stretch. Ill up it later in flower. I didn't realize Solubor could be concentrated so much. I may have to try that next time.
paperchaser825
Active member
I just did ionic bloom.....
Seems high in K to me...
169/49/281
Seems high in K to me...
169/49/281
What was the Ca and Mg? K doesn't look too bad at all as long as other parameters are met (use Mulders chart to get a better understanding of this) - P looks good although could poss do with a drop in stretch and an increase thereafter (mid to late bloom).
Agreed, he has done a great service for the community in creating hydrobuddy. Never used it myself (work with a pen, paper and calculator) and another piece of software I had programmed for concentrates meeting ppm, %w/v targets but it looks like a great piece of software.
paperchaser825
Active member
So what are you guys going off of as far as when to drop P, when to raise P, all that good stuff. Everything I have learned has been HeathRobinson style with a 1 part all the way through. You guys seem to have a bit more science behind you. Care to teach a bit?
Here's a few profiles for you to look over. Note the P levels in the H and G coco plus shooting powder - way way way too high and will result in nutrient antagonism - crazy how the hydro industry has gone this way. H and G coco looks very good as a formula as does CNS 17. H and G coco definitely needs some cal mag when used with RO water though but I was impressed by their numbers. The stupid amount of P in PK additives though needs to be avoided so if you can find something like PK 3-14 etc you'd be doing far better.
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That's what this thread does. Have a read. It's all there. Sam knows his stuff.
I know high levels of K seem to be the norm around here, but Ive yet to go that path. Im only feeding at 130ppm K atm. 281 would seem to be luxurious feed levels. Id expect diminished returns at that level.
Ive always wanted to try out a side by side with clones to see if higher K levels do make a difference, but as it is when I boost P later from 30ppm to 60, Ill be upping K to around 155ppm.
I dont believe thats a feature of the software. Least not that Ive seen.
''I didn't realize Solubor could be concentrated so much. I may have to try that next time''
Max solubilities can be found on the net, ph and temp dependent. Other elements in solution effect as well. I run my all my micros at 1000x in the same bottle.A and B macro stocks 100x sometimes I put the micros in them but. I could push te concintrations by jar testing but have no reason. I use distilled water for stocks as well.
Max solubilities can be found on the net, ph and temp dependent. Other elements in solution effect as well. I run my all my micros at 1000x in the same bottle.A and B macro stocks 100x sometimes I put the micros in them but. I could push te concintrations by jar testing but have no reason. I use distilled water for stocks as well.
Yep I would have thought it would have taken some incredible computations to work out EC because every salt has a different electrical charge - so perhaps it converting from ppm to EC. I mean it is doable but the math and DB for this would have to be hardcore. Even then when I've done the math myself in the past on paper there tend to be some anomalies along the way. And yes Steiner was the big gun in the cation-anion research. I think though that perhaps Schon (1992) had it more right in stating that regardless of cation-anion balance the nutrient should be tailored for the plants needs. This becomes more relevant when a deeper understanding of plant physiology is applied and when Steiner began his work back in the late 50's I believe there were huge gaps in plant physiology knowledge. So for instance on a very simple level plants have preferential uptake requirements and aren't specifically doing this in terms of electroneutrality - they are uptaking what they require - some nutrients at very high levels (active uptake), others at intermediate uptake and others at passive uptake. The electroneutrality then takes place in the plant tissues by movements of positive (H+) or negative (OH-/HCO3-) charges across the plasma membrane by means of membrane transporters. What Steiner said, in simple terms, was this required energy and slowed growth. What Schon said was that what would slow growth even more is inadequate nutrition which Steiner's formulas were in many cases.
What EC are you running and what is your full nutrient profile? I find high K is the bomb at the right points in time. These came off a approx 4 foot light dep plant I grew in a greenhouse. Own strain - high CBD to THC ratio.
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paperchaser825
Active member
Holy shit. What a long read. Finally got through most of the meat I think. Props to sam for keeping shit pertinent. I think my ionic bloom is certainly too high in K for veg now. Still think the K is high for flowering too, but we'll see.
