Yellowing of lower leaves...

SenorSanteria

SenorSanteria

Well-Known Member
Ive got about 3 plants vegging in a closet under a heck of a lot of CFL's. Each plant is getting plenty of light for now, but most of them are destined for outdoors once I pick out the males. But the problem Im having is that about half of the plants have experienced yellowing (and eventually, dying) of their lower leaves. Most of them only have this on the first node, but a few of them have yellowing on the second node. Ive been trimming the dead leaves, but im curious what's causing it? The upper portion of the affected plants look perfectly healthy- thriving, even.

Temps at 78-80 at all times, humidity is at 60% (thats as low as i can get it for now, its relatively steady but sometimes spikes up to 80 when I water). PH is perfect.
 
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SenorSanteria

SenorSanteria

Well-Known Member
Whats the easiest way to add JUST nitrogen? I used a soil (mixed with the rest of my medium) that has 2-1-2 NPK but I didnt use a lot of it. How should I go about adding nitrogen?
 
ceestyle

ceestyle

Well-Known Member
well, how many nodes do you have? if you're losing only one node, this could just be normal shedding, especially if you have the plants packed relatively close to one another.

CFLs, unless you have an absolute shit-ton, will not satisfy your plants completely, and they will stretch upward to the light. the consequence of this is that the lower growth will be shaded, the plant will decide it's not worth keeping, and it will yellow and fall off.

if you want to test that by adding some nitrogen, make a tea of earthworm castings, guano, or fish emulsion. these are all very high in N, but watch the guano, as it's hot, and some is higher in phosphorous than nitrogen. as with any change in nutrition regimen, ease into it to avoid overnutrition and shock.
 
SenorSanteria

SenorSanteria

Well-Known Member
ceestyle said:
well, how many nodes do you have? if you're losing only one node, this could just be normal shedding, especially if you have the plants packed relatively close to one another.

CFLs, unless you have an absolute shit-ton, will not satisfy your plants completely, and they will stretch upward to the light. the consequence of this is that the lower growth will be shaded, the plant will decide it's not worth keeping, and it will yellow and fall off.

if you want to test that by adding some nitrogen, make a tea of earthworm castings, guano, or fish emulsion. these are all very high in N, but watch the guano, as it's hot, and some is higher in phosphorous than nitrogen. as with any change in nutrition regimen, ease into it to avoid overnutrition and shock.
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I have about 450w of CFL light. Thats about 15 CFL's of varying sizes and intensity. I also have two T12 light fixtures on the sides, with each bulb (4 total) putting out 42w, so the lower nodes have plenty of light. The largest plants have 8 nodes (working on the 9th). The smallest plants have about 6 nodes. They were all started at the same time, but there are some that are MUCH smaller than others. I have the big ones on the outside, and the small ones on the inside to utilize as much light as possible without blocking any from each other.
 
SenorSanteria

SenorSanteria

Well-Known Member
I think im going to try the earthworm castings because they seem to be the most gentle on the plants and they should do the trick. Where do I get them, and how should I apply them? Just put them around the base of the plant, or what?
 
lexterian

lexterian

Well-Known Member
This is what i did.
At any homedepot.Get "Vigoro all purpose plant fertilizer" 10-10-10.
Put one teaspoon in a milk jug(perfect gallon).Shake it well.
Then give the plants 150-200ml of it.
Or you can buy bone meal or blood meal(forgot wich one is only N).
follow the directions on the back and use at half strenght of the meal.Use the amount of water indicated on the back.
 
moniqa2004

moniqa2004

Well-Known Member
you might have to repot your plants to a bigger pot. same thing happened to me and i repotted from a 3 gal bucket to a 5 gal and the plant thrived afterwards. grew real fast too.
 
SenorSanteria

SenorSanteria

Well-Known Member
It was nitrogen. I gave them some 29-3-4 nutes and they loved it. Some of the yellow leaves regained color, some were too far gone so I trimmed them. I also have identified 3 females so far. :)
 
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