Nutrient burn or ph problem?

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grou

Active Member
Hello. This is my first ever post asking for advice and help. Im a beginner grower. This is my 4th grow. First 7 days was fantastic, i didnt give nutes. On 8th day: 3.5ml micro; 2.5ml gro and 1ml bloom on 5 liter container. Watered plant maybe too much. next day noyiced slight discoloration on the center of the leaf which turned brown. After symptoms i flushed with ph balanced water. But its spreading. Its sligthtly smaller than other plant. points: when i flushed water that came out of fabric pot was 7.4 ph. Growing in soil ph:6-7. First time growing autos. Any kind of advice will be apreciated. Key question: when should i feed my plant? been watering with ph balanced ever since.
Strain: lsd auto from barneys farm
How old: 15 days from planting germinated seed
Light used: led : purple and white.
 

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spek9

Well-Known Member
grou said:
bio mix agro perlite and peat substrate. today did my fair reasearch and my best guess is fan burn . thanks for reply
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Fan burn? Where'd you get that from? What kind of fans do you have cycloning in your grow area?
 
G

grou

Active Member
spek9 said:
Fan burn? Where'd you get that from? What kind of fans do you have cycloning in your grow area?
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the thing is my box is wery small. originally built for only 1 plant, at the time i have alot of plants in it since they are still small, https://www.growbarato.net/blog/en/burns-cannabis-leaves/ this is the thread which i found interesting because, the fan was closest to this plant and other plants werent affected. turned off the fan today.
 
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spek9

Well-Known Member
You can start feeding now, at 1/4-1/2 dose every few days. Ensure to pH your water to 6.0, as you stated that you're growing in peat, and peat, being a soil-less medium requires a more acidic pH than soil does. When you give only water, you must pH that to 6.0 as well.

How are you measuring pH... do you have a pen? If not, get one, and buy calibration solution with it, and use the calibration liquid. I check the calibration of my pen every two weeks or so.

The vast majority of cannabis plant growth issues is directly related to water. pH out of range or poor pH consistency and over watering are the two main causes of poor plant health.
 
twentyeight.threefive

twentyeight.threefive

Well-Known Member
grou said:
when i flushed water that came out of fabric pot was 7.4 ph. Growing in soil ph:6-7.
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You've fed them nutes, you flushed the medium, and have been watering with "pH balanced" water since? 6-7 is quite a range. Try to aim for the same pH each time. How has so much watering happened when they look maybe 2 weeks old?
 
G

grou

Active Member
spek9 said:
You can start feeding now, at 1/4-1/2 dose every few days. Ensure to pH your water to 6.0, as you stated that you're growing in peat, and peat, being a soil-less medium requires a more acidic pH than soil does. When you give only water, you must pH that to 6.0 as well.

How are you measuring pH... do you have a pen? If not, get one, and buy calibration solution with it, and use the calibration liquid. I check the calibration of my pen every two weeks or so.
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i have pen and measure my ph on every watering, before measuring i make sure my pen is calibrated by 6.86 calibrating mix. thank you for replying.
 
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spek9

Well-Known Member
grou said:
i have pen and measure my ph on every watering, before measuring i make sure my pen is calibrated by 6.86 calibrating mix. thank you for replying.
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Drop the pH to 6.0 as I said, since you're growing in peat and not soil. 6.9 is too high for soil-less, and can block uptake of certain macro and micro nutrients.
 
G

grou

Active Member
twentyeight.threefive said:
You've fed them nutes, you flushed the medium, and have been watering with "pH balanced" water since? 6-7 is quite a range. Try to aim for the same pH each time. How has so much watering happened when they look maybe 2 weeks old?
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first time autos, as i know they have limited time to veg, if it was not auto i would just waited but i researched and the best suggestion i could find was to flush it with ph balanced water, since that didnt work i registered to this forum and asked for opinions. after flushing i watered once. fed with nutes on day 8 flushed on day 9, waited till it dried and watered slightly today.
 
G

grou

Active Member
spek9 said:
Drop the pH to 6.0 as I said, since you're growing in peat and not soil. 6.9 is too high for soil-less, and can block uptake of certain macro and micro nutrients.
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mostly my ph is 6.2 and 6.6. i calibrate with 6.86 mix. peat is one of the 6 components in my mix (which i bought already mixed in) it contains: coco fiber; burned dung; soil; bio mix ; agro perlite and peat substrate.
 
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spek9

Well-Known Member
grou said:
mostly my ph is 6.2 and 6.6. i calibrate with 6.86 mix. peat is one of the 6 components in my mix (which i bought already mixed in) it contains: coco fiber; burned dung; soil; bio mix ; agro perlite and peat substrate.
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It's still a soil-less mix. You need to pH at 6.0, consistently. Plain water, and mixed nutrient/water solution. Always check and adjust your pH after you've mixed in the nutrients.
 
G

grou

Active Member
spek9 said:
It's still a soil-less mix. You need to pH at 6.0, consistently. Plain water, and mixed nutrient/water solution. Always check and adjust your pH after you've mixed in the nutrients.
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will do thank you for your time and opinion.
 
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