Eastwind
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There are 3 usual scenarios....Hello growers. I'm in a soil grow of Northern Lights. My Ph is 6.5. Daytime 60-70s at 49rh. Period: into the 4th week of flower. Lighting: Led & CFL, total 555watts. Nutes: Dyna Gro Bloom, Superthrive, Molasses.
On these symptoms, it is not all of them on every plant, but here they are: Leaf color: lower fans, yellow with some reddish and purple areas. Leaf symptoms: Lower older growth, red stems, old leaves drop off, slow growth (some), some (on one) twisting/abnormal leaf growth. Plant symptoms: red or purple stems, slow growth, one one - stretch in buds, not fattening.
Possible errors I've made: improper watering ( without having run off ), not letting the plant dry out enough before adding more water, and there was a temp fall a few nights...into the low 40s/maybe 38-39.
All 5 plants have LST. 1 is a good green with fat buds, 1 is a good green, stretchy, thin buds, 3 are runts, that never got a real dark green, are short, but for their size the bud look good & fat, their stems are purplish.
Since my Ph seems good, I was going to do a flush (plane water or with a reg dose of Bloom 3-12-6 ?) to see if that sets it right. Some say the cold nights may have done this and its not due to low P... I have been using Bloom in my watering (water was mixed - some filtered store bought, some from my tap). By the look of the white hairs on the buds and the Tri's ( some red/brown hairs and clear Tri's ) I have maybe 3-4 weeks to harvest. Photos: 1 thin bud, 2 off color leaves, 3 bud top, 4 good plant. Any suggestions are appreciated.
There are 3 usual scenarios....
1 is a phos def
2 your flower nutes have made your ph swing over time and youre locking phos. Which means theres plenty of phos.. your plant just cant get to it right now.
3 cold weather lowers the conductivity of roots
How many more weeks to chop... you should probably check runoff ph tooSo maybe a plane water flush at the next feeding time? See how things respond after that? I may have gone a little heavy on the feedings a few times...that combined with the cold might be the answer. So, other than a flush, just let it be ( and keep the night temps up)?
How many more weeks to chop... you should probably check runoff ph too
Checked the runoff today....its still at 6.5. I gave them all a good flush, with about 20% runoff out to the tray....just in case there is some salt buildup in the pots. We have had some cold nights here. When the timer goes off...it shuts down the lights and fans...so cold air may travel in thru the vent window( that runs to the outside). Now I put a piece of foam insulation in there at lights out to cut down on the cold air blowback at night.How many more weeks to chop... you should probably check runoff ph too
Its probably the cold air if your run off is there... it cooled down the rootsChecked the runoff today....its still at 6.5. I gave them all a good flush, with about 20% runoff out to the tray....just in case there is some salt buildup in the pots. We have had some cold nights here. When the timer goes off...it shuts down the lights and fans...so cold air may travel in thru the vent window( that runs to the outside). Now I put a piece of foam insulation in there at lights out to cut down on the cold air blowback at night.
Veg nutes only a couple weeks from flush? .. i would guess pkIf your ph is same as its coming out then your plants are hungry i say bump up feed possibly add some veg nutes into the equation
veg nutes from start to finish plus bloom boosters fulvix and vitamins in flower equals healthy plants from start to finishVeg nutes only a couple weeks from flush? .. i would guess pk
Interesting. .. im not a big fan of excess nitrogenveg nutes from start to finish plus bloom boosters in flower equals healthy plants from start to finish
I have done it that way for years with great results just slowly lower veg nutes but still even feed last week light dosage
Looks great bud.. my bud pumped too much nitrogen this year and wasnt impressed with frost or taste... the reason OPs plant is showing p- is because it was a little extreme in temp drop and it lowered the electric conductivity of the rootsNo shit GT try it what happens is people flip to flower and stop using veg nutes forst 2 weeks on 12 / 12 plant is using up all te Nitrogen TBH its still in veg / strech phase by 3rd week N is used all up and what bloom nutes have for N is not enough
Please try it you will be in WOW factor specially needed in tree grows View attachment 647224 View attachment 647225
I agree cold ambient temps can cause p issues but when we look at thermal mass in general in soil @ feet depth in relation to outside temperatures we soon find about 8 - 9 degree warmer per foot depth but this is in actual earth 24 hr period
View attachment 647242
Being this is grown indoor and during 12 hrs of lights off
lets keep in mind below grade surfaces are surrounded by soil not air..
The conductivity of soil varies with soil types and moisture content.
But on average its 40 - 50 times more conductive then air.
Actually i am going to start a thread on heat loss and how to calculate it who knows maybe be a pinned thread View attachment 647242
Woops....thank you...will raise em today.i hope you have your pots raised off the the conrete floor this will also slow growth rates. And drop soil temps fast
Thanks for your input Mango. For measuring, I am just eyeballing with a 1/8 tsp measuring spoon...and going 1/2 to 3/4 recommended dose via the label. Don't know how to do PPM readings yet. Today I aerated the soil in the pots with a thin stick....the soil was still moist from 2 days ago's flush..so the cold is messing with the uptake ( it usually needs water by now). Also, last night I closed the vent window at lights out. That made a big difference today...I could feel it was much warmer...temps in the 70s. I will continue to do that because I think things will improve.Couple things, temps are too low during lights on and WAY to low at lights out. Nighttime temps should stay in the low 70's and daytime mid to high 70's. Your plants are probably taking 6 out of the 12 hours of light to recover from being frozen. Also do not use super thrive in flower. It's for veg, and the whole vitamins thing for your plants is very overrated. What ppms are you feeding?
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