Need help desperately

[mjr99]

How long has this problem been going on?- 2 weeks
What STRAIN are you growing? - bb x nl
What was the establishing technique? (seed or clone?)- seed
What is the age of your plants? - 4 weeks
How long have they been in the soil mixture they are in now?- 4 weeks
How Tall are the plants?- 12 inches
What PHASE (seedling, vegetative or flower) are the plants in? - veg
What Technique are you using? (SOG, SCROG etc)- topped at 2 weeks
What size pots are you using? (Include how many subjects to pot) - 5 gallon
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?)- promix bx
What Nutrient's are you using?- ff big bloom, ff grow big, cal/mag, superthrive.
How much of each nutrient are you using with how much water? *Knowing the brand is very helpful* - 1/2 strength grow big, full stregth bb, full stregth bot cal/mag, 1 drop of ST
How often are you feeding? -twice in 4 weeks
If flowering, when did you switch over to using Bloom nutrients?- n/a
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect)- bloom 1st
What is the TDS/EC/PPM of your nutrients used?- dont know
What is the pH of the "RUN-OFF"?- 6.4
What method of pH test was administered? Using Strips? pH pen?-pen
How often are you watering?- only watered 3 times including 1 flush
When was your last feeding and how often are you feeding?- 4 days ago after flush
What size bulb are you using?-600w air cooled
What is the distance to the canopy?- 14"
What is your RH Factor? (Relative Humidity)30-40
What is the canopy temperature?- was 90 until last week now its 82
What is the Day/Night Temp? (Include fluctuation range)64-82
What is the current Air Flow? (cfm etc.) two 400 cfm inlines
Tell us about your ventilation, intake exhaust and when its running and not running ?- One fan is connected to a sealed hood then to the intake. The other to a sealed hood then the carbon filter. The one connected to the intake is off when the lights are off.
Is the fan blowing directly at plants?- yes
Is the grow substrate constantly wet or moist?- very much
Is your water HARD or SOFT?- started with very hard tap but flushed and feed last time with RO
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?- RO
Are you using water from a water softener?-no
Has plant been recently pruned, cloned or pinched?- yes, topped!
Have any pest chemicals been used? If so what and when?-no
Are plant's infected with pest's?-no

ETC: leaves tips are pointing down. grey/brown spots started from the bottom and are making their way up. not much yellowing taking place.

THANK YOU

 

[psycho pirate]

looks like maybe something is off with the PH... you are usimg pro mix so you really shouldn't have ph problems but it might be salt buildup... try cutting out the cal-mag because the pro mix already has micro and macro nutrients... keep using the RO water and flush well then let the soil dry out really well before you water again

 

[dank_stanky]

kinda looks like a mg. issue to me,could have a lockup of it from high acidity from bad ph, or to high cal. you said you use r.o water, which strips the water of cal. and mg. . fertilizers typically use less or little of those nutes since they assume they are present in the water. check your ph in the soil,flush with water , then start over with your nute program. Also add some type of cal mag to your water when you fertilize. it will take about a week to show results.

 

[mjr99]

kinda looks like a mg. issue to me,could have a lockup of it from high acidity from bad ph, or to high cal. you said you use r.o water, which strips the water of cal. and mg. . fertilizers typically use less or little of those nutes since they assume they are present in the water. check your ph in the soil,flush with water , then start over with your nute program. Also add some type of cal mag to your water when you fertilize. it will take about a week to show results.

thanks.

I actually did add a tsp of cal/mag after the flush about 5 days ago. I initially thought mag or cal def too but after doing some reading i think leaf tips point up with mag def (mine dont) and the spots start on the younger leafs with cal def(they didnt).

How many gallons should i pour through my soil if im flushing 5 gallon pots?

 

[psycho pirate]

Try using Epsom salt for quick mg def. fix... its packed with alot of mg that is pretty easily absorbed by the plant... 3 gallons of water for every gallon of soil for a good flush

 

[mjr99]

Try using Epsom salt for quick mg def. fix... its packed with alot of mg that is pretty easily absorbed by the plant... 3 gallons of water for every gallon of soil for a good flush

so you are pretty sure that its mag def im dealing with?

 

[psycho pirate]

so you are pretty sure that its mag def im dealing with?

No, actually I think its nutrient lockout, to me mg def is pretty easy to notice and take care of... Lockout on the other hand is a bit harder to deal with

 

[DrGreenThumb@OZ]

overwatering can also cause nutrient lockout ...

so can excess salt buildup so giving nutirents one week only and the rest straight water..

if using tap water let it sit in open container 24 hours before giving to plants ..

 

[SmokeSumThin]

hows it goin mjr99
to me it looks as if you are overfeeding the plants. I had the same issue with young plants from seed they cant take as much as lets say a good rooted clone. What i would do is flush em out really good and when its time to feed again only feed half of what you feed previously until they turn around and then bump them up to the desired level gradually. you already know what they need but its just too much of it in my opinion.

 

[mjr99]

hows it goin mjr99
to me it looks as if you are overfeeding the plants. I had the same issue with young plants from seed they cant take as much as lets say a good rooted clone. What i would do is flush em out really good and when its time to feed again only feed half of what you feed previously until they turn around and then bump them up to the desired level gradually. you already know what they need but its just too much of it in my opinion.

hey man. flushing again was my initial reaction but im thinking if it didnt help before then it might not this time. unless i didnt do a proper flush. i actually did exactly what you said. i flushed then feed half of what i feed before. which was a really light dose. the spots seemed to stop pregressing right after the flush only to have started up again. another thing i need to consider is that my soil is drenched right now. its been drenched since day 1 actually. i really dont know what to do. i think if it were a mag def the cal/mag i gave them would have had time to work by now. i guess i could do a light foliar feeding with it. hopefully the spots will not progress to a point that i have to flush while the soil is still soaked. thanks.

 

[Lazyman]

They're very pale green, I would say they look like a cal/mag deficiency, overwatered a bit (which slows nute uptake) and underfed. BTW, to flush, add 3 gallons water per gallon of soil of 1/4 strength nutes.

I think you just need to add more nutes and cal/mag, maybe drop your ph a little.

 

[SmokeSumThin]

yea bro but after the flush i wouldnt feed again until i see some of the good new growth happening. with mine i had the same type of prob burning and curling, all i did was just flush and then feed real lightly. ( keep in mind im in hydro) your in soil. I would just give them plain water ph'ed of course until they start to shape up, if it were me no more food until they're ready and askin for it. But if you just drenched em then maybe you should hold off until the soil dries then if problem gets worse take action. In the pic it looks like the new growh is fine to me you could already be on the right track (Hopefully and soil master will chime in for ya)

 

[mjr99]

The lights just came on and they are definitely doing worse. More and more spots. I seriously dont know if i should flush or feed. My last feeding a couple days after the flush was really lite. 2 tbl of ff big bloom(.01-.3-.7), 1 tsp of cal mag and a drop of superthrive so the guy above could be right. They may be hungry. Im using pro mix bx and the soil isnt clumpy right now so i may flush one plant tonight and see what happenes. Maybe ill foliar feed another plant and compare results. A few of my plants are doing fine and im trying to remember what i did different. I think the ones that are hurting are the ones that got a taste of the ff grow big(6-4-4) after they were flushed . Only .75 tsp though. thanks.

 

[jyme]

well flushing deffently wont hurt them ladies ive read over and over the info you have posted 6.4 on the runoff isnt bad your dont feed to much by what you posted and the heat was all hot prieor i hope there was plenty of fans a circulating the air do you have co2 in use and i would go ahead and do the folar feedings for cal/mg def.good luck with your ladies and keep use informed on how they progress