Lets Play, " Identify this problem before it kills my plant !!! "

T

tumescent85

Member
Watermelon strain
About 45 days in to flower
Temps in 70s
Res temp mid 60s
Rh low 40s to mid 50s
12/12
LED bloom/veg 260w - 9-1100 ppfd
Advanced Nutrients- Bloom A / Bloom B -24ml
CalMag -24ml
Big Bud - 16ml
Carbo Load - 16ml
H2o2 - 10ml
3.5 gallons
Ppm I think 1200-1250
 

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PH? Not sure if the "Carbo Load" is necessary in a hydro grow, plants don't take in carbohydrates from the water or soil, they manufacture them through photosynthesis. Soil microbes take in carbohydrates and use the energy to break down nutrients and make them available to the plant.

Edit: That seems to be a lot of Calmag, it could be that the Ca is at/near toxic levels and interfering with the uptake of other nutrients.
 
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Never grew hydro but in past with soil i would cal mag and those rust spots would clear up.
 

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Phytoplankton said:
PH? Not sure if the "Carbo Load" is necessary in a hydro grow, plants don't take in carbohydrates from the water or soil, they manufacture them through photosynthesis. Soil microbes take in carbohydrates and use the energy to break down nutrients and make them available to the plant.

Edit: That seems to be a lot of Calmag, it could be that the Ca is at/near toxic levels and interfering with the uptake of other nutrients.
Click to expand...
Input at 5.7 -5.8
 
Advanced nuts cal mag ? If yes shut it down. It has too much N and it can lock your nuts out, gives you N toxicity and tons of problems. I'm using it 1 time every 2 or 3 weeks and I solved all my problems. If ph is ok you should give them a good flush and next feed half dose bloom A 3-0-0 too. You need less N now more pk. A full picture of plants could help a lot
 
kappakeepo said:
Advanced nuts cal mag ? If yes shut it down. It has too much N and it can lock your nuts out, gives you N toxicity and tons of problems. I'm using it 1 time every 2 or 3 weeks and I solved all my problems. If ph is ok you should give them a good flush and next feed half dose bloom A 3-0-0 too. You need less N now more pk. A full picture of plants could help a lot
Click to expand...
20240226_081102.jpg20240226_081108.jpg
 
kappakeepo said:
Advanced nuts cal mag ? If yes shut it down. It has too much N and it can lock your nuts out, gives you N toxicity and tons of problems. I'm using it 1 time every 2 or 3 weeks and I solved all my problems. If ph is ok you should give them a good flush and next feed half dose bloom A 3-0-0 too. You need less N now more pk. A full picture of plants could help a lot
Click to expand...
Flush and next feed half bloom A , half calmag and what of bloom B ?
 
Nute lockout locking out other nutrients its not pests from all i can see



Phytoplankton said:
PH? Not sure if the "Carbo Load" is necessary in a hydro grow, plants don't take in carbohydrates from the water or soil, they manufacture them through photosynthesis. Soil microbes take in carbohydrates and use the energy to break down nutrients and make them available to the plant.

Edit: That seems to be a lot of Calmag, it could be that the Ca is at/near toxic levels and interfering with the uptake of other nutrients.
Click to expand...
Yeah i think your right bud
 
tumescent85 said:
Flush and next feed half bloom A , half calmag and what of bloom B ?
Click to expand...
No dude . After flushing your girls and it's time to feed again, don't use cal mag at all . Back off your bloom A 3-0-0 from now on too at 50% . You don't need much N right now. If you read carefully at cal mag, it Says 1ml per litre to prevent and 2ml if you got problem. That means you are throwing cal mag grenades all this time to your plants.
What's your ppfd ? Looks like your girl foxtailing
 
kappakeepo said:
No dude . After flushing your girls and it's time to feed again, don't use cal mag at all . Back off your bloom A 3-0-0 from now on too at 50% . You don't need much N right now. If you read carefully at cal mag, it Says 1ml per litre to prevent and 2ml if you got problem. That means you are throwing cal mag grenades all this time to your plants.
What's your ppfd and room temperature by the way ?
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So the micros other than cal and mag in the calmag that are not contained in bloom A or B are not needed ?
 
tumescent85 said:
So the micros other than cal and mag in the calmag that are not contained in bloom A or B are not needed ?
Click to expand...
Everything is needed dude but balance is the key. What I see in your plants is N toxicity and nut lock out and this happens 100% because of a.n cal mag. It has too much Nitrogen. It's even stronger than bloom A. What helped me to go though this problem is give cal mag one time every 2 weeks or if I see cal mag deficiency. And bloom A half dose after week 4 to prevent tons of tiny leaves that you will have to trimm later. I believe you got foxtailing too right ?
 
kappakeepo said:
Everything is needed dude but balance is the key. What I see in your plants is N toxicity and nut lock out and this happens 100% because of a.n cal mag. It has too much Nitrogen. It's even stronger than bloom A.
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I have read the bottle , but the issue I've had is my thoughts were a dwc system being void of macro and micr nutes meant that I had to create the enviroment in fullness and because the cal mag has nutes the 2 part bloom does not that meant I needed to add the cal mag at every feed to maintain the presence of those nutes. Now while that may be true like you said the 1ml is the portion needed as part of a regular feeding to prevent. I see where I have gone wrong. And I am currently feeding bloom at half dose. So flush, drop the cal and do bloom at half.
 
tumescent85 said:
I have read the bottle , but the issue I've had is my thoughts were a dwc system being void of macro and micr nutes meant that I had to create the enviroment in fullness and because the cal mag has nutes the 2 part bloom does not that meant I needed to add the cal mag at every feed to maintain the presence of those nutes. Now while that may be true like you said the 1ml is the portion needed as part of a regular feeding to prevent. I see where I have gone wrong. And I am currently feeding bloom at half dose. So flush, drop the cal and do bloom at half.
Click to expand...
Only bloom A , bloom B keep it as it is .
 
i have a couple questions what are you using to check your ph, how often do you calibrate your instrument? how often do you check the ph of your reservoir ? also what instrument are you using to measure your ppfd, 1100ppfd is pushing them pretty hard without co2
 
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