Yellowing dying fan leaves. Week 1 flowering

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Noxide

Active Member
Hi guys, This will be my 3rd DWC grow. Ever since i switch to DWC ive had sub-par results. My last grow was my first time with SCROG and was by far the largest ive ever harvested, but was plagued with deficiencies and the potency was terrible.

HYDRO GROW

Strain - Dutch Passion Strawberry Cough
# of Plants - 1
Grow Type - Hydro / Scrog
Grow Stage - Flower
Setup - DWC
Light - 600 Watt HPS
Nutrients - General Hydronponics Lucas Formula
Medium - Rockwool
PPM - 900
PH - 5.7
RH - Not sure
Room Temperature - 68-73
Solution Temperature -68 to 72
Room Square Footage - 8
Pests - None Known


So I really want to make sure this grow goes better. But already I see all my fan leaves taking a crap as soon as I switch the lights to 12/12. I just switch the lights 2 days ago, and immediately something is happening. Please take a look at my pics and tell me what you guys think. You can give me opinions on my setups also. I typically use 5 Gal buckets, but this time I went to a larger tub.

Also would it be better to do a scrog with 1 plant or multiple plants?

Can I share a tub this size with other plants?

One big plant? or Multiple smaller plants?

Thank you guys.
 

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70's natureboy

70's natureboy

Well-Known Member
Your setup sounds about perfect to me. Different strains have different nute requirements. I never grew strawberry cough but she looks hungry. I just came back to the Lucas formula after a couple years of experimenting and the girls couldn't be happier. If your at 8ml/gal I would give them 50% more because they seem to need it.
 
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churchhaze

Well-Known Member
The lucas formulas lacks the green bottle, which is high in potassium. That could be the issue.

Although you could just get a pound of potassium nitrate instead of the green bottle.. it's basically the same thing, minus the magnesium.
 
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Noxide

Active Member
Yes im using RO water. The light was about 8" away with my 400W MH, but i switched to 600W HPS and now its about 18" away.

I do see burning on the tips, so I do feel like its got enough food. The PPMs are also rising, meaning shes drinking more water and less nutes.
 
hicountry1

hicountry1

Well-Known Member
Noxide said:
Yes im using RO water. The light was about 8" away with my 400W MH, but i switched to 600W HPS and now its about 18" away.

I do see burning on the tips, so I do feel like its got enough food. The PPMs are also rising, meaning shes drinking more water and less nutes.
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Are you using a CalMag supplement? If not I assume this is your problem, try adding it and should help. The fact that your tips are burning does not mean the ppm is too high necessarily, it could have been the light was too close causing the tops to draw more water thus causing a false type of burn on the leaves. I run my ppm at 1200-1500 in bloom. I also keep my light 18-20 inches away although I have found 600's burn my tops at that distance, try raising the light a bit as well.
 
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Noxide

Active Member
Thanks for the input. Its funny you mention about the 600w burning. I just got the 600w on my last grow (that grow turned out bad). And the whole time it seemed like the leaves directly under the middle of the light were discolored. I was thinking maybe 600w was a little too much for my small grow tent 2x4x5. I can always switch back to my 400w.

I am not using CalMag, but have some on hand. I'll add some to my water today and see what she thinks about it.
 
hicountry1

hicountry1

Well-Known Member
I don't think its the 600 being to much for the tent, just that they burn so bright it may be prudent to hang it a bit higher.
 
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Noxide

Active Member
Cool. I have the light a bit higher.

Today I added about 50 ML of calmag to my res (per calmag directions)

I also added 15ML of Micro. I was going to just top off with RO water till res change, but it really does seem to be a N deficiency going on.
 
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Noxide

Active Member
I got carried away on pruning today and i think i took off too much. ALSO, this plant doesnt drink very much water. This is my first time using a tub, which holds almost 10 gals, but when I was using a 5gal bucket, it seems like if i missed a day the bucket would be empty. Right now I can go a good 2-3 days without a noticable change in water level. Take a look.
 

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B

BuddyLeeCU

Member
Noxide said:
Cool. I have the light a bit higher.

Today I added about 50 ML of calmag to my res (per calmag directions)

I also added 15ML of Micro. I was going to just top off with RO water till res change, but it really does seem to be a N deficiency going on.
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Pretty sure your pH is too low. Bump it to 6.2
 
purplehays1

purplehays1

Well-Known Member
http://www.420magazine.com/forums/indoor-soil-cultivation/114733-ph-nutrient-uptake-charts.html

Cannabis only absorbs nutrients at the right PH and it also only absorbs certain nutrients if others are also present. For example, Ca and N are dependent on each other, if you are not feeding Ca with N the N or Ca will lockout (cant remember which but this is just an example). This is also true of many other nutrients, and if you have a nutrient lockout you are likely ending up with a salt buildup from the other nutrients that are not being absorbed.

If you are using the lucas formula u are likely having a problemn with the ratio of the nutrients. Lucas works but it is far from ideal and has more micro nutrients than you need. This may be causing the lockout.

I suggest u flush VERY WELL and start over and follow the ratio 3-2-1 bloom-micro-gro. The one bottle of grow will last you forever, you really are saving very little by not using it, and the Lucas formula is not ideal, it has much too high of the micro nutrients. The GH recommended schedule is IMHO a greater formula than Lucas and may be a simple solution to your issues with lockouts.
 
purplehays1

purplehays1

Well-Known Member
CORRECTION, THE GH RECOMMENDED RATIO'S, NOT THE RECOMMENDED DOSE, 50% STRENGTH WILL BE PLENTY FOR MOST STRAINS!!!!
 
purplehays1

purplehays1

Well-Known Member
hicountry1 said:
I don't think its the 600 being to much for the tent, just that they burn so bright it may be prudent to hang it a bit higher.
Click to expand...

IMHO that plant does not have a heat issue. If it was heat the leaves would not be turning that pale green/yellow color as much as they would be cupping/canooeing.
 
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Noxide

Active Member
purplehays1 said:
CORRECTION, THE GH RECOMMENDED RATIO'S, NOT THE RECOMMENDED DOSE, 50% STRENGTH WILL BE PLENTY FOR MOST STRAINS!!!!
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purplehays, thanks for the thoughts. But are you mistaking me for growing in soil? The PH range im in is fine for N, and if I got any higher, it will be out of range for the Ca. Just pretty consfused right now.

Im going to give it a few days and see what happens with her. Is there a flushing agent I can find around the house to help flush the roots?
 
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