Grow Mediums Useless' Formula Tweak For Autos

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I was wondering if anybody had tried this formula with autos. I have searched with no luck. A friend of mine uses it on photos with great success. But Useless has it written for 7 weeks and I have seen some autos go 12+ weeks. Could anyone possibly taylor this schedule for autos to go past the 7 week mark? As this is my first indoor and auto grow. Just not sure best way to readjust it around a little for autos. I am wanting a good feed sched for autos using GH Flora 3 part nutes as that is what I have and my friend said it would work great with some readjusting. I will be growing Budda Seeds Magnum and Sweet Seeds Dark Devil autos in Hempy Buckets with straight perlite and 1200w Led. Any help would be greatly appreciated. The formula schedule is at bottom of this post

Thanks In Advance
Eddie

GH 3 part - Useless' formula
OK, I figured I would post this here, since some folks are asking about the GH 3 part.
This is my feed schedule -


Here is the nutrient regimen I use and how I control PH with little or no ph up or down...


So OK - feeding schedule week by week. This is the GH weekly feeding program, slightly tweaked. I will only call out the volume of each part per gallon of water in the following manner: grow, micro, bloom, ppm range. Example - 5-2.5-2.5-400/800 would mean 5 ml grow, 2.5 ml micro, 2.5 ml bloom and a ppm of 400-880. Remember it's per gallon. You Euro's can easily convert to liters. 4 liters is just a little bit over 1 gallon. It should also be noted that I use the hardwater micro due to my tapwater. I suggest using the hardwater micro in place of the regular micro if your tap water is over 200 ppm total or you have over 70 ppm Ca. RO water users should use the regular micro.
Veg -
week 1 5-2.5-2.5-400/600
week 2 10-5-3- 600/800
week 3 12-6-3 800/1000 (continue week 3 formula if additional veg time is required.)


Bloom
week 1 6-6-10- 800/1200
week 2 3-7-12 - 1000/1400
week 3 3-8-14 - 1000/1400
week 4 3-8-16 - 1000/1400
week 5 (discussed in detail below*)
week 6 0-7-20 - 1000/1400
week 7 0-6-20 (see bleow**)
* During week 5 if not using a booster like Superbud, Bushmaster Kabloom etc. run 2.5-7-18. I use MOAB (Mother of All Blooms) or BushMaster at 50% of recommended strength, and use 1.25-3.5-9 for the fert base.
**If running an 8 week strain you should only run the ferts during week 7 for a maximum of 3-4 days. This gives you 10 days for flushing. I should note that if I use ferts for a few days in week 7, I take the lants over the 8 week mark. Personally I flush for a min of 14 days. But 10 is bare minimum imo/ime.


The ppms work out almost exactly. I tend to lean toward the lower side of the range, unless I have a really heavy feeder that I know can handle it.


At every ressy change out I add in 5 drops per gallon of 35% food grade H2O2. During flush use ph adjusted water at 5.5-6.0
I will add epsom salt at week 1 of bloom if the plants are heavy feeders AND I see signs of an Mg def. Otherwise I won't use it. The only time I have ever had Mg def is during transition. The GH 3 part is a little low on Mg, but the PBP and Canna nutes are way lower.


Now- how to control your PH...
There are a couple factors that cause your PH to drift. The most common is running the nute solution too strong or too weak. If it's too strong, your PH drops. If it's too weak the PH rises. You have to find the balance point. If you find that the formula above is say, a little strong, and say you have a 20 gallon ressy, mix the nutes for 18 gallons. If it's a little weak, mix it for 22 gallons. You follow?
The other common mistake is mixing your nutrient solution and trying to adjust the PH right away. You have to allow time for the ph buffers in the nutrient solution to do their job. Mix the nutes up, and bubble or circulate for 12 hours before even looking at your PH. You will find the PH to be almost right on target.
I use little or no ph adjusters. (Except during flush). I use tap water, with a starting PPM of 300-400 and a starting PH of 7.4-9.0 (Thats crazy you say! The water is too hard, you will never get stable PH and you will have too much Ca, causing a lockout of Mg!) Bollocks I say.
Every week, on Friday I drain the ressy and fill with plain water. I let that run overnight giving the plants a little flush. This also allows the chlorine and ammonia to evap. On Saturday morning, I mix the nutes into the ressy. I DO NOT adjust ph at this time. Let that run as is overnight. On Sunday morning, I check ph and adjust if needed. Usually don't have to.
Doing things this way has saved me from constant PH drifts, and using about 150 ml of ph down every ressy change, and a little here and there throughout the week to keep it in the desired range. Now, the most I ever have to use is about 30 ml.if any at all. (I have a 35 gallon ressy btw) My Ph stays at a constant 5.5-5.8.


If you are still having PH issues using the above method, an alternative is to PH adjust the plain water to 5.5 BEFORE you add nutes.
 
I've used the GH Flora 3 part in soil less, but never in hydro, so I can't give you any specifics in that regard. In hydro I use House and Garden Aqua Flakes and AN supplements. A couple of points I can help with though. Generally speaking, autos only require about half the nutrient strength of photos, so you will have to take that into account. Looking at your schedule I think you might be a little nute heavy. In soil less, which is very similar to hydro, I basically follow the general GH guidelines of 3-2-1, 1-2-3. I start seedlings at 1-1-1 at 1/8th the recommended strength and go to 3-2-1 at 1/8th strength as soon as I have 2 sets of true leaves. Usually by my third feeding I'm at 1/4 strength. Then I watch the plants and up to 1/2 strength as soon as the plants look like they can tolerate it, usually around week 4. When vertical growth starts to slow, usually around week 5, I give a 1/2 strength transition feed of 1-1-1 at 1/2 strength. Once vertical growth stops, around week 6, I then switch to 1-2-3 at 1/2 strength and continue that until I start the finally plain water cleanse at the end.

The reason your schedule is short is that you are missing weeks 4, 5 and 6 of veg. More info about that here: https://www.autoflower.org/f44/life-cycle-auto-flowering-cannabis-5113.html

BTW, love your user name. There are a few of us around here old enough to remember who Eddie Haskell was.
 
I've used the GH Flora 3 part in soil less, but never in hydro, so I can't give you any specifics in that regard. In hydro I use House and Garden Aqua Flakes and AN supplements. A couple of points I can help with though. Generally speaking, autos only require about half the nutrient strength of photos, so you will have to take that into account. Looking at your schedule I think you might be a little nute heavy. In soil less, which is very similar to hydro, I basically follow the general GH guidelines of 3-2-1, 1-2-3. I start seedlings at 1-1-1 at 1/8th the recommended strength and go to 3-2-1 at 1/8th strength as soon as I have 2 sets of true leaves. Usually by my third feeding I'm at 1/4 strength. Then I watch the plants and up to 1/2 strength as soon as the plants look like they can tolerate it, usually around week 4. When vertical growth starts to slow, usually around week 5, I give a 1/2 strength transition feed of 1-1-1 at 1/2 strength. Once vertical growth stops, around week 6, I then switch to 1-2-3 at 1/2 strength and continue that until I start the finally plain water cleanse at the end.

The reason your schedule is short is that you are missing weeks 4, 5 and 6 of veg. More info about that here: https://www.autoflower.org/f44/life-cycle-auto-flowering-cannabis-5113.html

BTW, love your user name. There are a few of us around here old enough to remember who Eddie Haskell was.
Thanks Muddy for the info. Going to check out the link you provided.

Eddie
 
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