Chris P Bacon
Member
Thanks Mars
Glad to help. My advice, if you want to run different pH ranges than I suggest, is to see how well the plants do your way with higher pH ranges for a week or so, and then switch to the 5.4-6.0 pH range I've outlined in my reservoir tending thread. See which one your plants like better yourself.Hi Douglas, thanks for your reply and taking the time to make that other post.
I was going for the full pH swing but was noticing some Calmag deficiencies and somebody on another forum suggested that I up my pH, which I did and saw beneficial results. I have attached a graph of my pH levels.
View attachment 527914
You'd be surprised how much it gets stirred, even with only a small pump and running a limited number of times a day. Be aware, the longer you run a mag drive pump, the more iron it eventually pulls out of the nutrient solution.I think one of the problems I faced with having such a large reservoir and only relying on the drippers for stirring up has been stagnant corners. I am going to be rigging up my pump to stir the solution more on my next grow.
You'll find very stable and predictable pH with the r/o water, and it's a good move to make. No experience with dehuey water, but 55% RH will grow you less mold for sure.I have read a number of your posts where you have touted the use of RO water and I like what you had to say and will be investing in an RO machine before too long. In the meantime I'll be using a mix of the dehuey water and tap. I will also be following your advice to lower my humidity which I've been running at 70% for seedlings and 65% for veg. I've now started flowering one tent and I've set it at 55%.
This is due to your overly high pH and easy absorption of Nitrogen at those ranges. 15 years of dwc, and I stick with the pH ranges I recommend for very specific reasons.I am currently running 1EC, I had an initial problem with too much N at 1.2EC as the leaves were getting overly green.
Is it first in line for incoming air?Some of the plants are looking pretty good, one in the corner is looking not so good.
Think about this for a moment... 10 day old seedlings (with the correct amount of light, heat, humidity, airflow) can tolerate full strength nutes just fine.In my other grow I have just started with only four plants and they are going really well so far, which was the case for this tent too. Started with .7 EC this time as I think it was too hot last time but I didn't get any burn. I do have some very red stems in this tent though.
Expect to see rust slowly accumulating on the bottom of your res. When enough gets pulled out you'll begin to see iron deficiencies.I have Haleia pumps that I am leaving on 24/7.The power supply is in the tent so I can't switch on and off at my pleasure.
Yes, and as you suggest further down, the issue was too weak of solution instead of a specific deficiency.At the time I was raising the pH to deal with the Cal def, this was Day 28 https://www.icmag.com/ic/showpost.php?p=8804918&postcount=24 At the time it was pH 6
Then it's responding normally. As long as there's enough roots she'll recover fine.it was the one I chopped the roots off.
At a pH of 6, Nitrogen is easy to pick up and be used by the plant, so even low N formulas can do fairly well. Remember the excessive Nitrogen at 6.5pH?the EC is starting to get up to .8 .9, so perhaps I am starving them, however, I saw no N def, the opposite in fact.
I show up on your doorstep in the future and you hand me cannabis to try? Sure. Glad to help, even if that day never arrives. lolThanks for the help. Perhaps you can walk me through my other tent. It's day 28 and the plants are growing well so far. D/N temp 75.2/68 RH 65% rez temp 21.4 pH 5.45 (last night) EC 0.8 (tap .5EC pH7.56)
Yes, and as you suggest further down, the issue was too weak of solution instead of a specific deficiency.
Then it's responding normally. As long as there's enough roots she'll recover fine.
At a pH of 6, Nitrogen is easy to pick up and be used by the plant, so even low N formulas can do fairly well. Remember the excessive Nitrogen at 6.5pH?
I show up on your doorstep in the future and you hand me cannabis to try? Sure. Glad to help, even if that day never arrives. lol
Res temp 21.4. F? If so it's too cold, you want a minimum of 65F for nutrient absorption.
Dn temps and RH are fine, with 50% RH a target to shoot for the last few weeks of flower.
EC .8, with .5 of it being tap water elements, which leaves .3 for food. You're going to have to increase the nutrient strength. That's about 150ppm of nutes when full lighting (25-30wpsqft of LEDs) should need about 700 (1.4 EC) or more.
pH 5.45. This is good, and it should reach 6.0 in 7-10 days. Longer and there's too much nute solution for your wattage/space/plant-numbers. Shorter and it would help to increase the volume of nutrient solution you're using. Smaller res, faster pH rise. Larger res, slower pH rise.
My apologies, at this point dorkbook and icmag are my limit for time. Should you start another thread for this grow I'll be happy to participate. Let me know.