11/1/09 Group 1 Update - C99 'grapefruit' woes
I realize this could be over reaction of an over-anxious "parent," the place where the perceived damage is is also the part of the plant that faced away from the vegging light - but it could be something more...
This is C99 'grapefruit' in full, I separated her from the others with a cardboard divider to show a clearer picture of the plant
As to the health of C99 'grapefruit' from Group 1, I couldn't say what is happening for certain and it is curious because whatever is effecting her is only effecting her and not the other plants in the system.
The best way to start to describe it is I noticed she was getting sparser than her sisters and that her leaves, seemingly from the middle were turning yellow - oddly not really dying, but going very, very yellow. New growth is green, but seems small which could indicate something specific or just be a reflection of. There is also a whole side to the plant that is lush and dark green and appears unaffected.
Close up of a leaf typical of the ones making me wory about the health of 'grapefruit'
This will surely effect yield but I wonder what it could possibly be - she's certainly getting enough nutrients, the highest PPM is 1500 and I'm using and if it were a fungus or bacterial problem, I'd imagine I would see something from the others - so I went with what I thought was my best option - I flushed the entire dutch bucket system (Group 1) for 24 hours using FloraKleen at the higher end of the recommended concentration of 2 tsp FloraKleen per gallon of plain water. I was nervous about taking away nutrients for too long while flowering, but figured 36 hours was an acceptable period especially as 24 of those hours were during the night cycle. I even let her bucket "flood" a little so as to clear as much of the hydroton as possible.
A troubling center shot of C99 'grapefruit' where the problem seems to emanate from. I took it under a different light to get a "truer" less yellow picture.
I'm torn between several deficiencies, lockout & overferting! Another thing to note - I've also noticed similar but far less extensive chlorosis on some of the fan leaves of grapefruit's sister plant, pineapple. C99 'grapefruit' could be slowly dying - I'm not too concerned, except as it effects the other healthy plants in the system as I have rooted cuttings of her - the plants from seed were more of a bonus harvest & a practice run before commencing the perpetual grow, so no whining here. But I'm very curious as to what is up with this plant. I'm going with Mg lockout for now - but I diagnose nothing with confidence - I've seen things that could indicate possible iron deficiency, over-nuting, nutrient lockout, potassium deficiency, nitrogen deficiency... so who knows and I am sure part of this is over analyzing the situation. I hesitate to say it is PH issues, as I am very on top of the PH and the fluctuation only goes up a point on average. I also don't think that over-concentration of nutrients are causing nutrient burn as I've been topping off the reservoirs frequently which keeps the PPMs low.
A picture of some of the healthy parts of the troublesome plant.
Hopefully the flush will have removed whatever was causing the trouble. As I've mentioned, I've started to supplement the plants with 5ml/gal of Cal-Mag+ and everyone seems to be loving it except our C99 'grapefruit' who is getting yellow. Perhaps I did not add it fast enough? Curiouser & curiouser... If anyone has any ideas - I'd love to hear them. Also, I should mention that the dutch buckets with the largest plants (grapefruit & pineapple) have occasionally flooded - I didn't know that this was a complication of dutch buckets when I went for the system - I resolved the issue each time, but maybe the flooding has something to do with it.
I took a bunch of pictures from different angles & under different lighting. One thing that occurred to me is it may have looked worse than it is b/c the yellow light of the Super HPS may have looked like more yellow leaves than there actually were.
The plant as it appeared under a brighter flash
The plant as it appeared under the HPS lighting.
This is a picture of C99 'pineapple', C99 'grapefruit's sister - she has some leaves exhibiting chlorosis but appears to not be suffering to the extend that 'grapefruit' is. Hopefully this is normal and not a sign of degeneration to come.
Additional leaves off of 'grapefruit' in various states of chlorosis.