HELP Don't want to lose my babies!

M

Mr I Grow Dank

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Okay so my plants are just over 4 weeks old from seed, just switched them over to 12/12. The past few days i have been getting brown spots on my plants i didn't take any notice and now all of them are affected. I have tried diagnosing the problem myself but there are so many friggin problems and cures listed on particular websites that i don't even know where to start :?. These are BROWN spots, the color looks different but that is the HPS lighting.

Here are some photos:


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Here is mine yesterday, I checked the soil ph it was 4 which is no good, I added wood ash, just burn some wood, I used about a 14 ounce glass sprinkled the ash on the soil top, watered very well, straight water, waited fifteen minutes rechecked the soil and now it is 6.5 Yours look the same or very close to mine. Here is a pic
 

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If you dont have one go to lowes, home depot or just a nursery, they are like ten bucks very cheap. I bet that is it
 
I had a feeling it might be something to with the PH/Nute lock out but I'm using Advanced Nutrients Sensi A&B which is supposed to be PH perfect??
 
Mr I Grow Dank said:
Okay so my plants are just over 4 weeks old from seed, just switched them over to 12/12. The past few days i have been getting brown spots on my plants i didn't take any notice and now all of them are affected. I have tried diagnosing the problem myself but there are so many friggin problems and cures listed on particular websites that i don't even know where to start :?. These are BROWN spots, the color looks different but that is the HPS lighting.

Here are some photos:


View attachment 2404067View attachment 2404068View attachment 2404069View attachment 2404070
Click to expand...


Noticed the ends of your leaves are curling upwards, thats heat stress. Whats the temps in the room? And also whats your dosage of nutes?
 
Not sure, its not overly hot in there. Also i have a fan pointed directly at the reflector. Lights are about 18 inches from the tops of the plants
 
Might just be a combo but best bet start with the ph, get it straight get the plant straight water and give it 48 hours , mine look better already today so I kknow I went the right direction. I am intrested to see what your ph is right now.
 
OH and i was Following the 1ml/L of water cutting and seedling stage with the A&B as mentioned above, I was doing this because i am using plagron light mix which is already fertilized for the first two weeks of growth so i didn't want to risk over feeding. Obviously i am going to be using the A&B bloom now as I've just switched over.
 
Dont get the kit just get a soil meter, long rod has digital readout, tellling ya I paid like 15 bucks for mine at lowes in the nursery section
 
Brown spots are salt burn due to not enough flushing, pot too small and letting the pot dry too much increasing the chance of nute burn.
 
The soil is pretty dry to be fair, pots are all 10L. But i don't understand why it would be nute burn when i am feeding so little (the amount AN recommend you give to a seed/cutting)..? Should i give them a good watering without any nutes?
 
Ok so here in Narnia it's too late to go to the local garden store so I'll have to measure PH tomorrow to see if that is a factor. Meanwhile i have given all my ladies about a 2 liter drink of room temp water. Hopefully this will dilute the salts and perk them up a tad. Will update either tomorrow or Sunday. Much love guys, enjoy the weekend <3
 
flush with straight water and only feed with nutes once or twice a week when the soil is dry water with just water and have specific days you water with nutes.
 
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