Week 5 of flower. Can you please identify the problem?

[rangerrunner]

These plants are on week 5. They are in 7 gallon pots with HP mix/added perlite. I'm using General hydroponics 10 part system. I'm not sure why they keep yellowing out and looking burnt. All ppms coming out are in good range. Can you please identify the problem?

 

[ArtfulCodger]

That looks like nute burn. What are the runoff ppms?

 

[GNick55]

looks like a big grow operation?

 

[rangerrunner]

That looks like nute burn. What are the runoff ppms?

Ppms going in at week 5 are around 700. I feed twice then do ro, they dry out every two days. The ppms coming out after the second feedings are no more than 1000. Then with ro it gets set back to around 200-300

 

[rangerrunner]

looks like a big grow operation?

Only 12 plants and 12 lights

 

[rangerrunner]

I thought it was nute burn, but I'm feeding at the medium strength suggested by gerneral hydroponics. They always look great till week 4 or 5, then start yellowing at the tips.

 

[GNick55]

well i’d say there’s definitely some light stress and or underfeeding and incorrect feeding,..
10 part feeding??
what the heck is that?
and HP you mean promix hp? with added perlite,..

 

[BobBobsled]

Ok let's break it down. I've seen this before.
It at first glance looks like a potassium issue. HOWEVER it's affecting the top leaves so can't be that.
People will say because of the burnt tips that it's overfeeding BUT you always want to push the plants as much as u can get away with.
**What stand out to me is the top most leaves on the taller tops. The leaves are pointing upward on the sides resembling a canoe shape. This is a heat/light stress. It looks like that because of this the plant is doing some funky things. My experience tells me that there's a phosphorus issue in the top of the plant because of the heat/excess light and is unable to mobilize nutes correctly. I'm betting because of this you have soil buildups and possibly a soil PH issue which is compounding the problem. Water with plain ph adjusted water a small amount.then 20 min later water again just until run off and measure pH of the run off.. Could be wrong about the pH thing but I'm NOT WRONG about the heat/excess light stress.

 

[Desplegdo]

I 2nd what Bob said just about the heat and excess light u can see it at the top

 

[rangerrunner]

Ok let's break it down. I've seen this before.
It at first glance looks like a potassium issue. HOWEVER it's affecting the top leaves so can't be that.
People will say because of the burnt tips that it's overfeeding BUT you always want to push the plants as much as u can get away with.
**What stand out to me is the top most leaves on the taller tops. The leaves are pointing upward on the sides resembling a canoe shape. This is a heat/light stress. It looks like that because of this the plant is doing some funky things. My experience tells me that there's a phosphorus issue in the top of the plant because of the heat/excess light and is unable to mobilize nutes correctly. I'm betting because of this you have soil buildups and possibly a soil PH issue which is compounding the problem. Water with plain ph adjusted water a small amount.then 20 min later water again just until run off and measure pH of the run off.. Could be wrong about the pH thing but I'm NOT WRONG about the heat/excess light stress.

Noted, I took ph of run off and of the soil. Soil was 6.2 and run off was 6.0. These led lights are at least 6 years old and I have never had a problem in that room until I switched to general hydroponics. The heat never gets above 74 in that room with tons of fans blowing on the canopy. I have grown in this room for 5 years and have never had this problem until switching from hydroponics research. I have a new room up that is in week 3 of flower and it just started showing the same signs. The light distance is at 3 feet and room is 74 degrees. I'll post pics of that room.

 

[rangerrunner]

If you looks closely at the larger fan leaves there is "burning" on the tips. I also uploaded my nutrient chart which shows how many ml of nutrients are in 55 gallons of water. The only change i have made was bumping my cal mag up to 275ml per 55 gallons of water.

Is it possible that using only 100ml of cal mag the whole time was my issue. I bumped the calmag up just yesterday.

 

[deerman12]

My first thought was Calmag. I was wondering if you used it or how much. My first grow looked like this when I didn't use Calmag.

 

[DavidCarvajal]

Cal-Mag issue not lights try and try Molasses especially late in grow

 

[HerbalEdu]

if it doesn't spread significantly (and from my experience it most prolly won't) let it be ...

i d personnally don't give a damn about slight burnt leaf tips, when it happen (depending strain(s) or phenotype(s) witihin a strain) it has no signifiant impact on bud growth ...

 

[Bdubs]

If you looks closely at the larger fan leaves there is "burning" on the tips. I also uploaded my nutrient chart which shows how many ml of nutrients are in 55 gallons of water. The only change i have made was bumping my cal mag up to 275ml per 55 gallons of water.

Is it possible that using only 100ml of cal mag the whole time was my issue. I bumped the calmag up just yesterday.

Your 275ml of calmag in 55 gallons is 5ml per gallon. You are ~2.25 times higher than you ever should be mixing calmag. Positive ion calcium is taking up soil space. Magnesium becomes deficient and phosphorus gets blocked.

2ml per gallon on aggressive feed. 1200ppm. So if you are feeding anything less, you need less calmag.

 

[Bdubs]

Everything else on your feed chart is legit. You are basically running medium feed schedule. Your calmag is way way high and is the only issue in the feed.

 

[rangerrunner]

if it doesn't spread significantly (and from my experience it most prolly won't) let it be ...

i d personnally don't give a damn about slight burnt leaf tips, when it happen (depending strain(s) or phenotype(s) witihin a strain) it has no signifiant impact on bud growth ...

Did you see the intal pictures of the plants in week 3? That is obviously a plant that is super stressed and not growing to its full potential. The other photos i uploaded are in the start of week 3 and have been getting worse everyday, which is obviously a sign that something is off. I've never had burnt leaves in years of growing until switching to this nute line. So I'm simply just trying to figure out what's missing.

 

[rangerrunner]

Your 275ml of calmag in 55 gallons is 5ml per gallon. You are ~2.25 times higher than you ever should be mixing calmag. Positive ion calcium is taking up soil space. Magnesium becomes deficient and phosphorus gets blocked.

2ml per gallon on aggressive feed. 1200ppm. So if you are feeding anything less, you need less calcalmag

So for the plants that are in week 5 that I posted. I fed those plants at 2ml of cal mag per gallon the entire life cycle. What do you suggest is wrong then with the first photos I posted?

 

[Bdubs]

Are you feeding every pot by hand or are you on auto feed system? What are your habits.

This could easily be micro climate, soil too wet, cold soil, all sorts of stuff. And if your not skipping feeds and labeling each one on their own needs, you probably just have a sick plant and need to cut nutrients down and the lights.

But it looks like you are on a mass grow so I bet you wouldn’t be babysitting each plant. Mixing up buckets just for her and her and her.

This is going to be a personal adventure to figure out and you might find a new process of monitoring each plant.

Unless we get all the missing information down to the T, it’s going to be difficult for anyone to point out a specific deficiency or fix. Reason is because nutrients determine the light the plant can handle. If she is having trouble uptaking, she won’t perform the same as your others. No matter if you’re feeding to a T or not, she is sick and the light is too much for her to recover or she is in a pocket. Never know unless we know it all. Nutrients are not everything and sometimes light changes fixes everything.

look I baby my plants and no plant is the same. They want more or less sometimes and I have 2 plants that suffered more issues during growth. They don’t want as much water for multiple reasons including where they are located in the room, air circulation, micro climate, position to the light…all that causes them to need less and so I have to give it to them or they would be pissed off. You have some upset plants and reductions always work to fix problems. We never want to and we want to keep pushing them, but some plants just want less.

 

[rangerrunner]

Are you feeding every pot by hand or are you on auto feed system? What are your habits.

This could easily be micro climate, soil too wet, cold soil, all sorts of stuff. And if your not skipping feeds and labeling each one on their own needs, you probably just have a sick plant and need to cut nutrients down and the lights.

But it looks like you are on a mass grow so I bet you wouldn’t be babysitting each plant. Mixing up buckets just for her and her and her.

This is going to be a personal adventure to figure out and you might find a new process of monitoring each plant.

Unless we get all the missing information down to the T, it’s going to be difficult for anyone to point out a specific deficiency or fix. Reason is because nutrients determine the light the plant can handle. If she is having trouble uptaking, she won’t perform the same as your others. No matter if you’re feeding to a T or not, she is sick and the light is too much for her to recover or she is in a pocket. Never know unless we know it all. Nutrients are not everything and sometimes light changes fixes everything.

look I baby my plants and no plant is the same. They want more or less sometimes and I have 2 plants that suffered more issues during growth. They don’t want as much water for multiple reasons including where they are located in the room, air circulation, micro climate, position to the light…all that causes them to need less and so I have to give it to them or they would be pissed off. You have some upset plants and reductions always work to fix problems. We never want to and we want to keep pushing them, but some plants just want less.

Pot size is 7 gallons. Everything gets watered by hand. Each plant gets about 4.5 gallons a day, if i don't water every 24 hours all the plants will wilt. All my rooms are on everyday watering. I give each plant 10 secs of water at a time and move on to the next plant and go around the room until the 55gallons is gone. I feed, feed, then do ro. I give the plants 75 gallons of ro on ro days.

While I do of course have hot spots and cold spots in the room, the whole room looks the same as far as the "burnt" look. The plants with fewer leaves look worse. With all my rooms I'm not seeing any problems until week 3.

I really appreciate all the feedback you guys are providing. Thank you!

Also this room is melonade and gg4 which i have grown for over a year now and have not had this problem until switching to this nute line a month ago.