Nitrogen Deficiency in Flower

[dejayou30]

Yeah, the red stems and petioles have been prevalent throughout the grow. It has come and gone, not real sure what I did differently to make it disappear or reappear. I think I read about it being a phosphorus deficiency?

[dejayou30]

UPDATE: MORE YELLOW!

I don't know what to do. The yellow is progressing up the plant. There is also another plant that has a bunch of yellow leaves too. Both plants have a lot of redness in the stems, especially the stems of the big fan leaves. What is the deal???

pH has ranged from 5.8 - 6.1 over the past 24 hours.
PPM from 1500-1900. (added 2 gallons of water and diluted down to 1500 tonight due to low solution level)

First pic is most yellow plant, second is an aerial view of the other yellow plant. I didn't resize them this time for more detail, and they are a lot yellower in person.

EDI: Oops, they are also sideways. :wtf:

Also, the torn leaves look like a bug ate it, but I think its from when my leaves were twisted so they grew kind of weird.

[dejayou30]

There's also a lot of brown crusty spots on the ones that have been yellow for a couple days. I assume that means they are dying. Anyone have any ideas?

[dejayou30]

OK, so after looking the plants for a good while tonight, I have developed a theory, and its up to you experts to tell me if its feasible.

It looks like maybe the plant is consuming the older, larger leaves in light of new leaf growth around the bud areas. The leaves that have grown around the buds are a crisp, green, and look great, and a lot of the yellow leaves are the big single fan leaves, some of which are covering smaller lower buds. The lower bud leaves are just as rich and green as the higher ones. Is it possible that the plant is just eating up the large leaves to make way for buds and new leaves around the bud sites? The only problem with this theory is that it doesn't explain the redness in the stems.

[twoguysupnorth]

i know nothing about hydro, but two weeks into flowering they shouldnt be eating themselves already. if your ph isnt low then you need a small source of nitrogen. they have another 6 weeks to go.

[dejayou30]

Well its definitely not low pH. I have kept my pH more around 6 because I have been using the liquid test kit and its easier to tell yellow (6) than yellow-orange (5.7-8ish) without getting too lorange (5.5). I think I am just going to wait it out and see what happens. The new leaf growth around the buds has been rich and green and the buds are starting to pack on the pounds. Its pretty much just the old monster fan leaves that are cashing out.
What is the best way to add a small amount of nitrogen (in hydro) if needed?

[rhizome]

OK, so after looking the plants for a good while tonight, I have developed a theory, and its up to you experts to tell me if its feasible.

It looks like maybe the plant is consuming the older, larger leaves in light of new leaf growth around the bud areas. The leaves that have grown around the buds are a crisp, green, and look great, and a lot of the yellow leaves are the big single fan leaves, some of which are covering smaller lower buds. The lower bud leaves are just as rich and green as the higher ones. Is it possible that the plant is just eating up the large leaves to make way for buds and new leaves around the bud sites? The only problem with this theory is that it doesn't explain the redness in the stems.

Umm- that's not how it works. Yer plant is cannibalizing N from older growth to put toward new growth. Plants will do this w/ any of the " mobile" nutrients.
The early loss of your fan leaves will cost you yeild, and dearly.

If you want to add N, just use whatever your grow nute is- I RELIGIOUSLY use the grow nute through the first two weeks of 12/12. Prevents a lot of problems.

I have to ask- yer not letting ANY mylar come in contact w/ your nute solution, are you? Seeing mylar tucked under those net cups makes me worry- Aluminum oxide/nitrate/phosphate are not things you want in your res.

[dejayou30]

Umm I don't think so, because the water level doesn't get high enough, but I haven't really looked I guess. Ill try adding some of my grow fert tonight and see what happens.

[dejayou30]

Just to be clear - do you supplement with the grow fert or do you use it by itself. Also, if the mylar is touching the water, is it harmful to me in terms of smoking the final product or will it just kill my plants?

[wicker]

Hey, first post here at Cannabis.com. I'm with Rhizome, you are short on nitrogen. Your old growth is dying to support the new. This is way to early in 12/12 for this to happen and I wouldn't consider it healthy untill the last two weeks at the soonest. Heck, organic dirt farmers tend to not worry about it at all. You need to get your N up for the stretch. Depending on the strain, you may find you will need more N in bloom than most info would lead you to think, IMHO. Also consider getting your ph closer to 5.5/5.6.
Best of luck.