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Old 10-10-2018, 07:31 AM #1
Latino-grower
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Question Burnt and yellow leaves

Hey guys, my plants are having some trouble and I'm accepting advices... So, they are at the 6th week of flowering and, since about two weeks ago, they started to present some problems.
At first, I thought it was light burn or too much heat, as the lights of the grow were replaced three weeks ago, from 210W CFL lights to a 250W HPS (31k lumens) one, without cooltube and, at first, the yellow and burnt leaves were only the ones receiving direct light. The HPS light was placed around 30 to 35 centimeters from the canopy, but, a week ago, I moved the light to about 40 cm from the canopy, and the problem persists, even affecting leaves that are not directly under the lights...
Then, I increased the Mg on the weekly dose of ferts, imagining that it could be a Mg deficiency, but that didn't did the trick. I also tried to flush them with 6.5 ph water, to no effect (it was not a proper flush, though). After all that, the leaves are still slowly being affected by this problem and the buds are not getting fat in a satisfactory manner.
The plants (a Somango and a Super Silver Haze) are being fertilized weekly with BioBizz - Bloom, 10ml; Grow. 6ml; and Alg-a-Mic, 6ml - and Magnesium Sulphate - two teaspoons. Any ideas?


Super Silver Haze, the least affected oned (sorry for the lying down pictures)


Somango
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Old 10-12-2018, 01:18 AM #2
red23
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Quote:
Originally Posted by Latino-grower View Post
Hey guys, my plants are having some trouble and I'm accepting advices... So, they are at the 6th week of flowering and, since about two weeks ago, they started to present some problems.
At first, I thought it was light burn or too much heat, as the lights of the grow were replaced three weeks ago, from 210W CFL lights to a 250W HPS (31k lumens) one, without cooltube and, at first, the yellow and burnt leaves were only the ones receiving direct light. The HPS light was placed around 30 to 35 centimeters from the canopy, but, a week ago, I moved the light to about 40 cm from the canopy, and the problem persists, even affecting leaves that are not directly under the lights...
Then, I increased the Mg on the weekly dose of ferts, imagining that it could be a Mg deficiency, but that didn't did the trick. I also tried to flush them with 6.5 ph water, to no effect (it was not a proper flush, though). After all that, the leaves are still slowly being affected by this problem and the buds are not getting fat in a satisfactory manner.
The plants (a Somango and a Super Silver Haze) are being fertilized weekly with BioBizz - Bloom, 10ml; Grow. 6ml; and Alg-a-Mic, 6ml - and Magnesium Sulphate - two teaspoons. Any ideas?

View Image
Super Silver Haze, the least affected oned (sorry for the lying down pictures)

View Image
Somango
Hi there I think it must have all started with a leaf burn,and was translated later on as a deficiency of some sort.
I've been using BioBizz Bloom and TopMax only,at flowering stage,with exceptional results.
After flashing,I would have given the girls, just water for a few days, then 1/2 the amount in ml(Bloom/TopMax),to eliminate possible "lockdown" you might have accidentally caused.
I think its a combination of the two, light change a bit, but it all started with a burn that progressed in a "lockdown".That's why growth has slowed down.
It might help
Best of luck anyway(hope you have checked for mites etc)
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Old 10-12-2018, 07:16 PM #3
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Quote:
Originally Posted by red23 View Post
Hi there I think it must have all started with a leaf burn,and was translated later on as a deficiency of some sort.
I've been using BioBizz Bloom and TopMax only,at flowering stage,with exceptional results.
After flashing,I would have given the girls, just water for a few days, then 1/2 the amount in ml(Bloom/TopMax),to eliminate possible "lockdown" you might have accidentally caused.
I think its a combination of the two, light change a bit, but it all started with a burn that progressed in a "lockdown".That's why growth has slowed down.
It might help
Best of luck anyway(hope you have checked for mites etc)
Red23, thanks for your help! The last time I gave ferts to the plants was last week, on monday. Do you think I should skip fertilization this week and flush the plants again, this time with more water? I only used 3.5 liters of water to each plant on my last flush, which was on the last saturday (I'm using 7 l. fabric pots).
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Old 10-13-2018, 04:46 AM #4
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Originally Posted by Latino-grower View Post
Red23, thanks for your help! The last time I gave ferts to the plants was last week, on monday. Do you think I should skip fertilization this week and flush the plants again, this time with more water? I only used 3.5 liters of water to each plant on my last flush, which was on the last saturday (I'm using 7 l. fabric pots).
If since Monday,you haven't seen any significant(in your eyes)change,fllash her one more time.She won't mind.I feel that most probable cause for the latest yellowing, is "lockdown" due to excess nutrients in her diet.At the same time, you are aware some fan leaves will yellow when they are reaching the end of flowering.Do it when she is done with her day time circle, let her "sleep" after flashing.I always water, defoliate,feed etc plants when they are done with the lights.If there's something they don't like,it normally shows the morning after.
Burnt leaves beyond repair,I would cut them off.
Give her a few days on water, come back, with a photo if you can,and,then lets see what the leaves are saying.Temp. around 28C,humidity around 50%
P.S when flashing, water has to come out as clear as it goes in, if you get my meaning.All nutes out.
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Old 10-13-2018, 05:02 AM #5
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Quote:
Originally Posted by red23 View Post
If since Monday,you haven't seen any significant(in your eyes)change,fllash her one more time.She won't mind.I feel that most probable cause for the latest yellowing, is "lockdown" due to excess nutrients in her diet.At the same time, you are aware some fan leaves will yellow when they are reaching the end of flowering.Do it when she is done with her day time circle, let her "sleep" after flashing.I always water, defoliate,feed etc plants when they are done with the lights.If there's something they don't like,it normally shows the morning after.
Burnt leaves beyond repair,I would cut them off.
Give her a few days on water, come back, with a photo if you can,and,then lets see what the leaves are saying.Temp. around 28C,humidity around 50%
P.S when flashing, water has to come out as clear as it goes in, if you get my meaning.All nutes out.
Thanks again man, your lockdown theory makes sense, I think I went a little bit too far with the ferts... The plants day cycle is almost ending, I'll flush them again and hope for some improvements. Cheers!
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Old 10-13-2018, 05:36 AM #6
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Originally Posted by Latino-grower View Post
Thanks again man, your lockdown theory makes sense, I think I went a little bit too far with the ferts... The plants day cycle is almost ending, I'll flush them again and hope for some improvements. Cheers!
LG no problem.A question.
What's the flowering time for the girls, as described by the breeder?
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Old 10-13-2018, 10:09 AM #7
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LG no problem.A question.
What's the flowering time for the girls, as described by the breeder?
red23, I wasn't able to get the specific info from the breeder, as it's a very small one (Santa Semilla, from Chile), but acording to leafly, it's 10-11 weeks for the Super Silver Haze and 9-10 weeks to the Somango.
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Old 10-13-2018, 11:44 AM #8
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Hmm.. Have you been using these fertilizers for a while? What's your soil like? Are there nutrients in your soil? Is it amended?
I don't think you went to far with the macro nutrients. That stuff is 1-2-2 for bloom. That's really weak. i have a free sample bottle of bio bizz and i think i will just pour that bottle undiluted into the soil on 1 plant.
Kind of looks like a potassium deficiency. Epsom salt can be tricky to use. Why do you supplement magnesium and not calcium? And whyyyy 2 tsp of Epsom? That's an insane amount. It's a micro nutrient
Maybe I'm misunderstanding something but it seems like you are giving your plants more mag then n p and k.
10ml of Epsom at 10% mg
10ml of bloom at 1%n 2%p 2%k
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Old 10-13-2018, 06:53 PM #9
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Quote:
Originally Posted by Latino-grower View Post
red23, I wasn't able to get the specific info from the breeder, as it's a very small one (Santa Semilla, from Chile), but acording to leafly, it's 10-11 weeks for the Super Silver Haze and 9-10 weeks to the Somango.
Cheers.See how thing go,and,in about 2/3 weeks, you need to start contemplating reducing ferts,flashing(final),for the Super Silver Haze at least.
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Old 10-14-2018, 09:09 PM #10
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Originally Posted by CrushnYuba View Post
Hmm.. Have you been using these fertilizers for a while? What's your soil like? Are there nutrients in your soil? Is it amended?
I don't think you went to far with the macro nutrients. That stuff is 1-2-2 for bloom. That's really weak. i have a free sample bottle of bio bizz and i think i will just pour that bottle undiluted into the soil on 1 plant.
Kind of looks like a potassium deficiency. Epsom salt can be tricky to use. Why do you supplement magnesium and not calcium? And whyyyy 2 tsp of Epsom? That's an insane amount. It's a micro nutrient
Maybe I'm misunderstanding something but it seems like you are giving your plants more mag then n p and k.
10ml of Epsom at 10% mg
10ml of bloom at 1%n 2%p 2%k
Man, thats the 3rd time I use BioBizz, and before I never had any big problems like I'm having this time.

My soil is half spaghnum peat moss and half perlite, and I had a rootbound problem with this plants earlier, during veg (they are incredibly delayed, I planted them on april).

The plants were receiving those amounts of ferts on 3-4 liters of water. Apparently, I was suposed to water them, wait a little, and then give only 1 liter of water to both of them with the amounts of ferts indicated on BioBizz charts, which are about 1/3 of what I'm giving to them. Also, I already tried to increase potassium to counter a possible deficiency with no results. Maybe it is actually a potassium deficiency, but due to the lockdown on the soil.

Regarding the Mg, I don't think I'm giving them too much, according to what I see people doing... What do you think an adequate dose is?

BTW, thanks for the inputs.

Quote:
Originally Posted by red23 View Post
Cheers.See how thing go,and,in about 2/3 weeks, you need to start contemplating reducing ferts,flashing(final),for the Super Silver Haze at least.
Sure, I already flushed them, this time with 14 liters of water to each, though I'm not seeing any big differences until now... I think tomorrow I will start with the ferts again, but this time in a smaller dosage. Hope they build up more weight until harvest time. Later I will update here with some current pictures.
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