Please HELP with diagnosis

These are pictures from two different plants both 3 weeks old. This is showing the fan leafs.

soil- promix bx
nutes- one feeding of 2 tbl of big bloom
light- 400w hps... 14" above
temp/humidity- 90/65... 40 RH
Soil PH runoff- 6.4
Water- used tap at first but switched to distilled last feeding. Added 1 tsp of Cal-mag plus with the last feeding.


Thanks.

renyman said:

These are pictures from two different plants both 3 weeks old. This is showing the fan leafs.

soil- promix bx
nutes- one feeding of 2 tbl of big bloom
light- 400w hps... 14" above
temp/humidity- 90/65... 40 RH
Soil PH runoff- 6.4
Water- used tap at first but switched to distilled last feeding. Added 1 tsp of Cal-mag plus with the last feeding.


Thanks.

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can someone translate what the guy above just wrote?

could someone please help me? the spots are getting worse and ive already tryed epsom and cal/mag. i was able to lower my temps too. its moving from my lower fan leafs up to the top where it starts as small black/grey spots then takes over the whole leaf.

try and flush them. if it's spreading whatevers in the soil needs to bounce! good luck, you can do it mang!

oh man, 2tbsl of nutes! next time ease into it 1/4 strength then move you way up. if it's spreading then it was too much. not to late tho, try the flush! mine came out of it, and it seems like your getting to it early enough.

Yeah....

What soil are you using? Do you know if it has nutes in it?

raise that lamp up to at least 18" -24" get a good reflector and keep ph between 5.8 - 6, give us a ph rating for soil and water, you could be causing nute lock out, do all this and if the problem doesn't get better in 2 days flush it and add a 20-20-20 mix, personally i would stay away from big bloom untill week 6 or 8 or untill you fix this problem you could be overloading, or if its locked out just pouring you money down the drain

Drella said:

oh man, 2tbsl of nutes! next time ease into it 1/4 strength then move you way up. if it's spreading then it was too much. not to late tho, try the flush! mine came out of it, and it seems like your getting to it early enough.

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The big bloom is so weak though(0.01-0.3-0.7) isnt it? Im actually starting to think i maybe underfeeding.

uNDer0ath said:

Yeah....

What soil are you using? Do you know if it has nutes in it?

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pro-mix bx. no nutes.
the package says to start feeding by the first week.

supernovagrowlights said:

raise that lamp up to at least 18" -24" get a good reflector and keep ph between 5.8 - 6, give us a ph rating for soil and water, you could be causing nute lock out, do all this and if the problem doesn't get better in 2 days flush it and add a 20-20-20 mix, personally i would stay away from big bloom untill week 6 or 8 or untill you fix this problem you could be overloading, or if its locked out just pouring you money down the drain

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Could also be the cal/mag burning. I don't add cal/mag generally unless they need it.

If you are having problems using nutes, you should get a 7.00 air pump, a 2.00 air stone, a 2.00 5 gal bucket and some very basic nutes to make a mini feed reservoir.

That way you can control your PH, PPM and know exactly what your plants are getting.

Everyone has their own way but this is pretty easy.

renyman said:

pro-mix bx. no nutes.
the package says to start feeding by the first week.

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It depends on the strain. My NYCD's can take full strength nutes from week 2 but other strains like my Lemon Haze is super sensitive and I don't even start 1/4 strength nutes till the 3rd week.

It also depends on the medium as well. Every medium holds certain elements for different durations which also why its wise to start out with 1/4 strength and move upwards.

supernovagrowlights said:

raise that lamp up to at least 18" -24" get a good reflector and keep ph between 5.8 - 6, give us a ph rating for soil and water, you could be causing nute lock out, do all this and if the problem doesn't get better in 2 days flush it and add a 20-20-20 mix, personally i would stay away from big bloom untill week 6 or 8 or untill you fix this problem you could be overloading, or if its locked out just pouring you money down the drain

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I will try pulling the lamp back next. My hoods are sealed and air cooled but it was still low 90s at the canopy until a few days ago.
I flushed 5 days ago at the first sign with 6.4 adjusted distilled water. Then feed them 1tsp of cal/mag and a couple drops of superthrive along with 1 tbl of big bloom two days after the flush. The runoff after the last feeding was 6.5.. The soil has been soaked since day 1 and i initially started with tap water until the flush.

When you say flush then add a 20-20-20 mix. Do you mean i should pour in 10 gallons (my pots are 5) then give them the 20-20-20 on the same day right after the flush?

Thanks man.

uNDer0ath said:

It depends on the strain. My NYCD's can take full strength nutes from week 2 but other strains like my Lemon Haze is super sensitive and I don't even start 1/4 strength nutes till the 3rd week.

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That's very interesting. I wasnt aware of that. thanks.

renyman said:

I will try pulling the lamp back next. My hoods are sealed and air cooled but it was still low 90s at the canopy until a few days ago.

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Holy crap man! Remember their are 2 types of heat: Radiant and Air.

Radiant Heat is light heat and will not be detected properly by your standard therm. Air heat/temp is your 90 freakin degrees.

I just checked with my Yoda and we are both in agreement that it's too much of something.

My vote is let the soil dry out a bit and make her start to droop before your next feeding. Feed her just ph'd water and bing it up to about 6.8. Then continue your nutes but back off on your nutes a bit for the following feeding and see if it spreads further. Your leaves will not recover if the spots are dry and you may need to prune them if they are too bad.

I only see this when I change Nutes and it only happens to the bottom leaves.

after i flush i wait a day and add some 20-20-20 soil mix on top, then add water at 5.8 -6 ph but not a lot just enough to dampen the new stuff because after flusing the medium will be very damp and you have to becarful not to sufficate the roots remember when you add that much water you medium will compress a great deal and the roots can rot, i would seriously just try moving that lamp and waiting a little to see if that clears it up, i flush as an absolute last resort, remember except for a few strands are very easy to grow remember it is a weed and most strand are very resiliant ive seen plant that i helped people grow and the neglegted and they looked like there was no hope for them but they bounced back, now it does stunt growth and effect yeild but as long as perisites dont get it you should be cool

underfeeding won't give you any discoloration, just slow growth. I don't know what's going on, but it's not underfeeding. 100 ways to go by fixing it, but guaranteed flushing and slowly going back into your nute feedings is the way to go. nute to your discretion, but know that if you do too much, then you'll have to flush and start over, good luck mang! +rep if this helps!

Drella said:

underfeeding won't give you any discoloration, just slow growth. I don't know what's going on, but it's not underfeeding. 100 ways to go by fixing it, but guaranteed flushing and slowly going back into your nute feedings is the way to go. nute to your discretion, but know that if you do too much, then you'll have to flush and start over, good luck mang! +rep if this helps!

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This is what im dealing with. Could the 2 tbl of big bloom really have burned my plants? 0.01-0.3-0.7??? I have leafs that look alot worse. I guess ill give it a couple days and if it gets worse ill flush again then feed the next day with just cal/mag. Maybe a 1/4 tsp of grow big( 6-4-4)? Im using 5 gallon pots, should i seriously pour 10 gallons through each pot if i decide to flush?

Seriously, I would just water it again with only PH'd water, then water with Cal/Mag, Then Nutrients. If you break it up, it will help you diagnose. Doing this will only put you back a week.