Help with diagnosis

  • Thread starter OjoDeMalo
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OjoDeMalo

OjoDeMalo

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Hola

got a head scratcher. I looked through the list of ailments and couldn't find a match to my symptoms.
All the plants are happy, except for one that is showing signs of light yellow new growth. there are two others that show no signs all things being equal not really sure how to proceed. The one showing yellowing of new growth was also the one that was pollinated. This is a new development in the last week and has progressed slowly. phd and flushed 3 days ago and can't really tell if there has been any positive effect.
Thanks for taking a look.


1. Are you growing from seed or clones?
Seed, KOS CherryMalawi

2. How old are your plants?
8 weeks from seed, 3 weeks into flower

3. How tall are your plants?
3feet

4. What size containers are they planted in?
1gallon square pots

5. What is your soil mix?
100% organic compost

6. How often do you water and what type of water do you use?
when they dry out, about once every other day, when they dry out start to droop

7. What is the pH of your water?
no idea, then when the symptoms showed up and I started researching the problem..7.5pH. now pH has been corrected back to 6ish. Kit is one of the color kits, so its impossible to get a precise reading. Water sits in a 5gallon reservoir with air pump bubbling air through it. never direct from the tap.

8. What kind of fertilizer do you use and what is its NPK ratio?
Botanicare soil bloom. 1-4-5, some cal mag. never to full mix rates, always about 3/4


9. Do you foliar feed or spray your plants with anything?
nothing

10. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights")
240w 3500k COB,

11. How close are your lights to the plants?
18" 24"

12. What size is your grow space in square feet?
4x4 tent

13. What is the temperature and humidity in your grow space?
84-60 F, 38-53humidity

14. What is the pH of the soil?
no clue

15. Have you noticed any insect activity in your grow space?
had one beautiful C99 I moved in from outside that had to be culled due to ......russet mites. I caught it pretty quickly and none of these plants show signs. (digital microscope)

16. How much experience do you have growing?
year 2.5 continuous

(the one on the right)

plot 1.jpg
plot 2.jpg
plot 3.jpg
 
Aqua Man

Aqua Man

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Bloom nutes causing issues again.

It's nitrogen deficient and possibly other deficiency like sulfer or iron

Should add in a 1gal pot nutrient buildup is a possibility at this stage so measuring run off would be a good idea
 
OjoDeMalo

OjoDeMalo

65
18
Aqua Man said:
Bloom nutes causing issues again.

It's nitrogen deficient and possibly other deficiency like sulfer or iron

Should add in a 1gal pot nutrient buildup is a possibility at this stage so measuring run off would be a good idea
Click to expand...

Cheers, thanks for the reply.
what steps to rectify?. I thought it odd that only one was showing signs. I thought N as well but the leaf tips are showing that first little bit of nut burn. last two waterings were in straight pHd water. any recommendations for a iron and sulfur addition?
 
Aqua Man

Aqua Man

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OjoDeMalo said:
Cheers, thanks for the reply.
what steps to rectify?. I thought it odd that only one was showing signs. I thought N as well but the leaf tips are showing that first little bit of nut burn. last two waterings were in straight pHd water. any recommendations for a iron and sulfur addition?
Click to expand...
What nutrients are you using?
Can you measure the run off ppm?

Also that's a pretty high ratio of p. Not a nutrient ratio I would use. Just my opinion
 
OjoDeMalo

OjoDeMalo

65
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Aqua Man said:
What nutrients are you using?
Can you measure the run off ppm?

Also that's a pretty high ratio of p. Not a nutrient ratio I would use. Just my opinion
Click to expand...
I read one thread that mentioned using the Botanicare grow (still 3-2-4) all the way through bloom, and not to use the "bloom". do you think high levels of P could trigger a N lock out? Not sure how to measure the ppm of specific elements in the run off, have not researched that.
 
Aqua Man

Aqua Man

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OjoDeMalo said:
I read one thread that mentioned using the Botanicare grow (still 3-2-4) all the way through bloom, and not to use the "bloom". do you think high levels of P could trigger a N lock out? Not sure how to measure the ppm of specific elements in the run off, have not researched that.
Click to expand...
I would definitely switch back to grow and throw the bloom nutes in the garbage. Have seen a lot of nitrogen deficiency with them and high levels of P is toxic to cannabis and can create problems.

Nutrient ratios are all the same no matter the medium. Now not being a soil grower I would flush with 2-3 gal of of ph'ed water then do a feed of with the grow nutes and then give it time to dry out a bit before doing anything else.

Hopefully some of the soil guys will chime in on this
 
OjoDeMalo

OjoDeMalo

65
18
Aqua Man said:
I would definitely switch back to grow and throw the bloom nutes in the garbage. Have seen a lot of nitrogen deficiency with them and high levels of P is toxic to cannabis and can create problems.

Nutrient ratios are all the same no matter the medium. Now not being a soil grower I would flush with 2-3 gal of of ph'ed water then do a feed of with the grow nutes and then give it time to dry out a bit before doing anything else.

Hopefully some of the soil guys will chime in on this
Click to expand...
You Rock. thanks for the intel.
 
MIMedGrower

MIMedGrower

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I agree with @Aqua Man. The pbp soil bloom causes early yellowing for me too. I use just the grow bottle.

I would do what he said. Flush out with some fresh water and feed a low to mid strength dose of grow ratio.
 
Jack og

Jack og

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Size of pots would leave me to believe they are getting root bound. Lockout maybe an issue as it’s not feeding anymore. Up pot the plant with issues, next go if you plan on using a small container, go with air pots or media change to coco.
Also refrain from having plant droop before u water. The stresses cause extra root growth to search for more water/nutes, leading to additional root bounding.
solution: uppot to newer larger container. Fresher media /soil, add some time release nutes at bottom and begin feeding. Add a bit of veg nutes along with flower, I go 3 feeds of flower then one of veg at 1/2 ratio. This keeps the plants going when u have such a small container.
Feed more often
 
Dirtbag

Dirtbag

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This 100% compost you're growing in, is it homemade or store bought?

Looks like an immobile nute deficiency, likely iron.

Agree the small pot is likely causing root issues, and the ratio of the soil bloom is more suited for loamy soil, not 100% compost.
 
OjoDeMalo

OjoDeMalo

65
18
Dirtbag said:
This 100% compost you're growing in, is it homemade or store bought?

Looks like an immobile nute deficiency, likely iron.

Agree the small pot is likely causing root issues, and the ratio of the soil bloom is more suited for loamy soil, not 100% compost.
Click to expand...
Thank you for the info. Is there any issue with up-potting during flowering?
 
Dirtbag

Dirtbag

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OjoDeMalo said:
Thank you for the info. Is there any issue with up-potting during flowering?
Click to expand...

Yes there is, but the big question is which is worse... potting up in flower or letting it go super rootbound? I'm not sure I have a good answer for that one. If it were me I'd probably rather take my chances potting up than guaranteeing major problems from being rootbound.
Not an ideal situation no matter how you slice it.
 
Jimster

Jimster

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When pollinated, plants go crazy trying to make seeds and use all of their saved nutrients to assist thm. Flushing will only make it worse because you have removed whatever nutrients are available. The blooming nutrients also cause plans to use nutrients differently, as was mentioned earlier. I would give a dose of general fertilizer or something that also includes micronutrients.
 
OjoDeMalo

OjoDeMalo

65
18
Jimster said:
When pollinated, plants go crazy trying to make seeds and use all of their saved nutrients to assist thm. Flushing will only make it worse because you have removed whatever nutrients are available. The blooming nutrients also cause plans to use nutrients differently, as was mentioned earlier. I would give a dose of general fertilizer or something that also includes micronutrients.
Click to expand...
That makes total sense. I was wondering that as the only difference was the pollination. I'm sure they are all root bound. I usually go for much larger pots, 7g air pots, sometimes 10. This was pretty much a seed run and of the beans popped 3 male and 3 female ,so I kept em.
 
OjoDeMalo

OjoDeMalo

65
18
Dirtbag said:
This 100% compost you're growing in, is it homemade or store bought?

Looks like an immobile nute deficiency, likely iron.

Agree the small pot is likely causing root issues, and the ratio of the soil bloom is more suited for loamy soil, not 100% compost.
Click to expand...
The compost is all the old grow mixed with all the planting vegetable organics from the household and lawn mixed in and turned regularly, lots of worms. I have a bag of the black magic pro peat blend which drains super well. I do a mix with the two. Soil is well drained. (I) Have a strain that I've been working with that doesn't care about the small pots, but the cherry malawi is definitely not happy.
tell me more about iron.

Thank you!
 
Dirtbag

Dirtbag

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OjoDeMalo said:
tell me more about iron.
Click to expand...


A good article about iron deficiency, how to identify it and why it's usually happening. And usually its root problems, not nutrient availability issues.


www.royalqueenseeds.com

Curing Iron Deficiency In Cannabis - RQS Blog

Marijuana needs a host of supplements to thrive, in addition to the big three N, P and K macronutrients. Ignore iron deficiency at your peril.
www.royalqueenseeds.com www.royalqueenseeds.com
 
Jimster

Jimster

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I usually mix some composted manure into my mix, which provides plenty of Iron and other micro nutrients. Manure is pretty complete in regards to nutrients, but it can burn plants and roots if not composted or cut somehow. Farmers use raw manure but only on empty fields due to the "hotness" of raw manure. Once broken down via composting, it is much less abrasive to young plants and root systems and making the nutrients available in a manner that the plants can use them.
 
OjoDeMalo

OjoDeMalo

65
18
Wanted to follow up. I up potted to a 2gallon, and pHd water with increased nuts.
here is the result.
As you can see, the pale green tips are all but gone. (this pic was a few weeks back) the change was pretty quick.
I wanted to thank everyone for the spot-on diagnosis.
 
Green
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