Toxicity or burn? Potassium or phosphorus? Please help.

Hi. Would anyone be so kind as to tell me what’s happening in these three pics? Especially with number 1. I simply cannot identify the problem. I was having phosphorus and potassium issues. Then they started to flower and I started getting nitrogen issues. My lights are 1.5 to two feet away from each. Temps stay religiously between 72F-78F. Feeding with 1/4 to 1/2 measures of micro/grow/bloom once a week. These are autos. Please help!
 

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Wastei

Well-Known Member
60% coco, 30% happy frog, 10% perlite. 3 and 5 gallon fabric bags.
You should feed almost every day to substantial runoff. You're creating hotspots, salt buildup by letting the medium dryout to much between waterings/feedings. You're also mainly in coir so you should feed at every watering.

Try using smaller pots and increase the feedings.
 

Hook Daddy

Well-Known Member
Why mostly coco with a bit of soil? Go with one or the other, a bit of 10% coco and 10% perlite in 80 soil is fine, but I’ve if you’re going coco leave the soil out. What is your water ph and feed ec? Looks like cal def at least, and just hungry in general. Your medium has almost no nutes so you need to feed them.
 
Why mostly coco with a bit of soil? Go with one or the other, a bit of 10% coco and 10% perlite in 80 soil is fine, but I’ve if you’re going coco leave the soil out. What is your water ph and feed ec? Looks like cal def at least, and just hungry in general. Your medium has almost no nutes so you need to feed them.
Kind of new to growing. The YouTube people said to use mostly coco with soil. Ph between 6.2 to 6.5. I thought that I was burning them. They say that autos are more finicky than photos when it comes to nutes. They say that it’s easier to burn them. I’ve been trying to avoid that by giving them 1/4th measures. After I fed them the liquid nutes the first time, a couple started to give me problems. I backed off then. I’m just chugging along and trying to make it to the end at this point.
 
You should feed almost every day to substantial runoff. You're creating hotspots, salt buildup by letting the medium dryout to much between waterings/feedings. You're also mainly in coir so you should feed at every watering.

Try using smaller pots and increase the feedings.
Substantial runoff? Even with autos? I’ve been trying to avoid overwatering, sooo I haven’t been watering to runoff. I’ve also been letting the medium get fairly dry before watering again. Should I keep feeding 1/4th measures or up it to 1/2 for the advance nutrients bloom? I’ve been using 2ml of bloom in a gallon and feeding each plant about 1/3 of the gallon, once, maybe twice a week. Is that not enough?
 

Wastei

Well-Known Member
Substantial runoff? Even with autos? I’ve been trying to avoid overwatering, sooo I haven’t been watering to runoff. I’ve also been letting the medium get fairly dry before watering again. Should I keep feeding 1/4th measures or up it to 1/2 for the advance nutrients bloom? I’ve been using 2ml of bloom in a gallon and feeding each plant about 1/3 of the gallon, once, maybe twice a week. Is that not enough?
Forget all the old myths about Autos and start treating them like regular plants! You have to feed with every watering running coir, otherwise you will cause heavy pH fluctuations. I would start by raising them off the floor and start feeding to substantial runoff every other day. Good luck!
 

Hollatchaboy

Well-Known Member
Substantial runoff? Even with autos? I’ve been trying to avoid overwatering, sooo I haven’t been watering to runoff. I’ve also been letting the medium get fairly dry before watering again. Should I keep feeding 1/4th measures or up it to 1/2 for the advance nutrients bloom? I’ve been using 2ml of bloom in a gallon and feeding each plant about 1/3 of the gallon, once, maybe twice a week. Is that not enough?
60% coco, 10% perlite, you're not going to be able to overwater, so water to ~20% runoff
 

Cattery

Active Member
Just feed Coco nutes 100% recommended dose every day, 15% runoff EVERYTIME cannot stress this enough. People get lockout or "deficiency" so much in Coco just from lack of runoff, salts build up and &uck the roots:bigjoint:
 
Just feed Coco nutes 100% recommended dose every day, 15% runoff EVERYTIME cannot stress this enough. People get lockout or "deficiency" so much in Coco just from lack of runoff, salts build up and &uck the roots:bigjoint:
When I read this, it made so much sense. I just knew something wasn’t right. Salt buildup from watering every other day just to soak the medium seems like a plausible issue. Thank you!
 
Forget all the old myths about Autos and start treating them like regular plants! You have to feed with every watering running coir, otherwise you will cause heavy pH fluctuations. I would start by raising them off the floor and start feeding to substantial runoff every other day. Good luck!
Ph fluctuations seems right. I’m getting weird ph problems even though I’m diligent about ph-ing between 6.2 to 6.5. And I calibrate my meter every other week. Thank you!
 

Nope_49595933949

Well-Known Member
Kind of new to growing. The YouTube people said to use mostly coco with soil. Ph between 6.2 to 6.5. I thought that I was burning them. They say that autos are more finicky than photos when it comes to nutes. They say that it’s easier to burn them. I’ve been trying to avoid that by giving them 1/4th measures. After I fed them the liquid nutes the first time, a couple started to give me problems. I backed off then. I’m just chugging along and trying to make it to the end at this point.
YouTube should ban Mister Canuck.
 
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