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 Chapter 4
Registered: 08/27/08
Posts: 152
Last seen: 12 years, 10 months
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 Magnesium def? 
#130453 - 10/08/08 01:06 PM (16 years, 1 month ago) |
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What do you think.
ph 6.1-6.5
83-90F
coco soil with added pumice and chicken manure
was in 1 gallon pot, now 4 gallons (today).
24/7 cfl lighs, 140ish watts, 6000-6500k
water as needed, often once a day, sometimes every 2 days. never dries.
was heavily rooted in 1 gallon pot (very healthy looking roots)
i have only given ferts 3 times at half strength and 500ml water every time (scotts 20-20-20.
40ish days old
leaves seem a little stiff/brittle. if i bend them side to side (like a tube) they crack, not flex.
only the bottom leaves have slight yellowing on them now, as do a couple cuttings. one cutting had an entirely yellow leaf...cuttings only 10 days from cut, well rooted. similar soil but more pumice and no ferts. same lights/temps.
i thought these looked similar to those on codas guide.
pics.
plants
leaves
 
cutting
thanks for your input.
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Pipesmoker Elf
Super Coyote
Registered: 04/20/08
Posts: 37
Last seen: 9 years, 11 months
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Re: Magnesium def? [Re: Chapter 4]
#130461 - 10/08/08 01:23 PM (16 years, 1 month ago) |
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By coco soil you mean a mix between soil and coco? If so, in what measures?
The first pics look like there might be a magnesium deficiency, but the cutting looks more like a nitrogen deficiency. How old is the cutting? It could be that the leaves are turning yellow because the plant is using the nutrients stored in the leaves to put energy into root growth and new leaf growth, maybe a feeding is in order?
Also, i think you could slowly increase the nutrient dosage to full strength, since it is 40 days old already. 
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Chapter 4
Registered: 08/27/08
Posts: 152
Last seen: 12 years, 10 months
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cool thanks.
cutting is 10 days. its buddies are all ok, just this one went yellow. will fert lightly next watering.
i water the ferts down cause its 20-20-20...think this one could handle a full shot? i've never used 20-20-20 on pot before, so i am trying to be cautious lol.
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Pipesmoker Elf
Super Coyote
Registered: 04/20/08
Posts: 37
Last seen: 9 years, 11 months
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Re: Magnesium def? [Re: Chapter 4]
#130704 - 10/09/08 02:24 AM (16 years, 1 month ago) |
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Well, I think that taking it slowly on increasing the dosage, both on your mature plant and clones should be a good idea, so you can see the changes each time and know when and where to stop.
The clones might be a little more sensitive, so take it slowly.
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 coda
Registered: 04/20/08
Posts: 4,736
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no, a mg deficiency starts at the top of your plant and works it's way down. Also, you need to be really careful when diagnosing your Mg problems. If it's a problem associated with a lockout of Mg, then feeding it more won't do shit. You would need to fix the lockout problem first, then feed the plants.
Hydro and Soil less Mediums
Magnesium gets locked out of Hydro and Soil less Mediums at ph levels of 2.0-5.7
Magnesium is absorbed best in Hydro and Soil less Mediums at ph levels of 5.8-9.1
(Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Magnesium deficiency.
IMO it looks like you have the beginnings of a P deficiency. Sirius was going through the same problem you are, and his solution was an increase in the feeding of P. If you can, take one plant exhibiting the symptoms, increase the dosage of P, and watch. Take another, increase the level of Mg and watch. If one gets better and the other doesn't, then you know what actions to take.
Also, if your leaves start to look like this:
then you definitely have a P def. on your hands.
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MFDoom666: sobriety kills my buzz every time.
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Chapter 4
Registered: 08/27/08
Posts: 152
Last seen: 12 years, 10 months
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Re: Magnesium def? [Re: coda]
#136858 - 10/26/08 07:02 AM (16 years, 1 month ago) |
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thanks coda....its funny you mention this! i just put one into flower, and gave it a high P fert, and it is all green again! you nailed it! my ph is about 6.5-7, not budging up or down. so i think your right must have been P.
thanks!
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coda
Registered: 04/20/08
Posts: 4,736
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Re: Magnesium def? [Re: Chapter 4]
#136892 - 10/26/08 11:42 AM (16 years, 1 month ago) |
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no problem, glad to hear things are better
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MFDoom666: sobriety kills my buzz every time.
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