Why do I always have the same issue at 3-4 weeks flowering

[deviant1]

Well it seems that I keep getn a k def. around 3-4 weeks flowering. I was jus doin some reading, low rh and low night temps can cause these issues to appear. My rh is 15-25%, night temps have hit as low as 59F, but usually is around 63-65F. This is still too low for both, right? It would be great if this was the cause, bc i can fix both of these very easily, jus close my window. I thought it would be good for them to get fresh air, even if it was cold outside. Does this sound like what my problem is, if I'm wrong please let me know. If want pix, look in hempy album, there is a few pix of the leaves with the issue. Thanks to everyone in advance for your help and advice.

 

[BLUNToPOTomuss]

Thats a bit low, wont hurt your plants, Id run it up to atleast 70F if not 78F to be precise.

Good Luck

 

[deviant1]

Those were night time temps, as for the daytime temps, they usually run 77F-80F. Good day temps I think.

 

[hazy]

I'm more interested in what nutes you use and how much.
Why don't you post that and the relevant pics, so I don't have to back and forth through your album and here. Other info like pH if you know it.

 

[Mr. Hugeblunts]

Temps are not the issue- my grow runs at 65 daytime and 40 at night. No deficiencies

Sounds like your feeding is causing a lockout of some kind. More info is needed regarding feeding/pH/etc

 

[cyberwax]

You sure this aint a ph related issue? using drops or pen? when did u calibrate last? And if pen; check if it really works. Had somewhat the same issues and tried everything until i found out my ph pen was bugged. Thats when i got me some control drops.

 

[deviant1]

Yea accually, I am kinda thinking that's the case, a ph issue. The thing is I stopped checking my ph right after switched to hempy buckets. The reason I did this was I talked to someone, that really knew about hempys' and he said to not worry about my ph anymore. The wierd thing is that I was having problems untill I stopped checking the ph, so I don't check anymore. I only know ph of what goes in, 5.7-6.1 usually. My ppm going in are around 1000-1500

 

[superpedro]

RH low as yours can cause a lot of problems, I would attend that problem first!

 

[deviant1]

Hazy, I'm sorry that I can't get my pix into my post, I'm lucky I have any in my album as it is.

I can however, tell you what I'm feeding them. Btw, it's my indica that has the problem.

FNB- 5ml/gal
GH florablend- 10ml/gal
Floralicious plus- 1-2 ml/gal
liquid koolbloom- 5-7ml/gal
awesome blossoms- 4/gal
Florashield- 30 ml/gal

well I hope this helps out a lil bit, thanks again everyone.

 

[superpedro]

Hazy, I'm sorry that I can't get my pix into my post, I'm lucky I have any in my album as it is.

I can however, tell you what I'm feeding them. Btw, it's my indica that has the problem.

FNB- 5ml/gal
GH florablend- 10ml/gal
Floralicious plus- 1-2 ml/gal
liquid koolbloom- 5-7ml/gal
awesome blossoms- 4/gal
Florashield- 30 ml/gal

well I hope this helps out a lil bit, thanks again everyone.

How is your grow rate at the moment?
Too low RH slows or stops grow, plants stomata closes to save water locking out CO2. Since nutrients uptake is related to growth and not water uptake, you risk unhealthy nutrient buildup if you carry on at your normal nutrient ratio during a problem.

 

[deviant1]

Ok I've got my rh up to about 30% now.

Superpedro, yes I do think that they have slowed down a bit on growth, but not anywhere near stopping. Could rh cause a K def. That really seems to be what's happening at the moment.

Someone here suggested that I reduce feeding, should I feed them less often, or should I cut back the total ppms?

Thanks again for everyones help, much appreciated.

 

[FreezerBoy]

I've grown in sub 20 RH at lower temps without your problems. My guess is to much junk in the res and lack of pH control. The FNB is the only actual food source, everything else you list borders on snake oil. I'd increase FNB to 10-15 ml per gallon, leave everything else out, monitor pH and see what happens.

 

[deviant1]

You have been there for me b4 Freezerboy, so I'll give It a try. I'm not sure thought, that you know I'm using hempy buckets now, and in dwc, like I was last time you helped me out.

Do you think I need to worry myself about the low rh at All?

Seriously, lose everything except for the FNB? I was looking for just a lil tweak to what I was already using, but if you suggest it, I'll try it out.

Thanks again Freezerboy for your help.

 

[cyberwax]

As said and to agree with freezerboy; fix your ph issues and maintain a good one throughout the flowering. The reason why you are having issues after 3-4 weeks into flowering is that it is then plants really starts to exchange 1 part mineral for 1 part acid, making your res ph drop like a rock, especially if you have a small one. You can overcomplicate as much as you like or you can just fix ph and maintain a good one and watch your plants come back to life. The k def you apparantly see is ph blocking out the nutrients and the k def is just the first to show, be sure more will follow.

Also forget rh, rh is only viable when cloning, and if your doing watercloning; perhaps even not then. My rh is around 15-30, depending on when, and i can say with honesty i could never blame my problems because of that.

When problems arise do one thing: check ph, if its correct check your meter, calibrate it and check again, if its still correct check with drops and when your 100% sure its not ph you can move on to other issues. All def issues arise from the nutrient not beeing availible and if your using a commercial regular brand; then its ph OR issues with roots(rot, algae, etc).

 

[Gr33nman]

WOW!!! that was VERY well put cyber. freezerboy as well , but cyber took the ball and ran.

 

[FreezerBoy]

Deviant, I freely admit I have never done the Hempy thing, I'm just running the old binary search in my head. The only ingredient in your list that you need is the FNB. Whether the others are liquid miracles or snake oil, they're additives. Personally, I'd want to test the base unit first. Once that's established to work correctly without additives, things can be added one at a time. This way, when a problem shows up, blame is clear.

pH control is vital. It controls what the plant does and doesn't eat. While some may develop substrates that provide "automatic" pH control (like the dirt in your back yard), that just means they performed pH control all at once at the beginning, rather than incrementally along the way. They still performed pH control. How one does that in a hempy bucket, I don't know but, you need to figure it out.

 

[deviant1]

I concur, PH is the most important variable, but the thing is that I was told not worry about ph during and after feeding, jus ph the mix before it goes in. ThAt has been working, up till now, and I admit I was not to sure about following what they had said, but I did, and fine.

I'm pretty sure that I can figure out a way to Check ph regularly. One last thing for now, can you suggest a ph starting point, since it's jus like any other hydro setup, I thought maybe you could help there as well.

When I first started with hempys', I checked my ph often. It's was wierd, I put in 5.5 and when it came out a few mins later it would be around 6.7 ph. What's up with that, isn't that odd? Does that mean something I don't understand yet, I wonder?

 

[cyberwax]

I have never done hempy buckets myself either, but to my understanding its a bucket, vermiculite and perlite right? Im not even sure what the ph of vermiculite nor perlite is originally but im pretty sure thats why your runoff is higher than your feeding water. Never really liked growing mediums to be honest, they bring in another element you have to mix into the fold.

If i were to give any advice upon further grows, not that i would encourage drug useP), i would just go for dwc buckets, or a mix of dwc & low pressure hydroponic buckets.