Only the tops. 4-5 Bottom leafs will yellow and fall off but that is through the whole grow and just part of the normal process I believe. So I was assuming it was the immobile nutrients but to be honest I dont know which nutrients those are lol.
So there is alot here lol. And defintly not the first time Ive seen this wheel on the forums and confusion is a good word for it lol. But to see if I understand what your saying. Is to cut back on the MC once you have some good flowering going on and supplment with something that is just high on P&K and low on N?Hi CD', long time! (fortunately?)
...so, you're using only MC, no Sweet Candy, PK booster (Bud Explosion), other PK boosters? I like MC, but it has some down sides...
IMO, it's too light on P and too heavy on N for bloom stage; many folks here start dialing back the MC and adding in a PK booster... BE is very K heavy, nearly 1:2 ratio of P:K (reformulated recently,...again! I need to check this out, but I think it's still close to this)... During bloom, there's some solid evidence that during early to mid/late bloom, higher P to lower K ratio is better, and for finish, the opposite... K, S, Mn are more critical at this point for rich terpene production....
The hitch is, cutting back on MC also cuts back on everything else: secondary and micronutes, along with the myriad supplemental goodies.. BE is pretty much just P and K, and I see some folks going to another more nutritionally complete PK booster and/or better ratio's; even a base bloom nute to use in conjunction...
Another thing, it's harder to assess MC's ppm richness because so many other things are in there (besides nute salts), including non-ionic stuff that doesn't register well on TDS/EC... 3g/gal is about half strength? -- based on 1 level tsp = 6g ... this is a pretty mild solution....
OK, symptoms look mainly K related, but P and Mn defc. are suspect too... the hitch is, both K defc. and K-toxicity present nearly the same!...classic tip and margin teeth burning... If that 3g of MC is all there is, I'm leaning toward defc. not toxicity... the secondary late showing symptoms are more uncertain, but I'd say that's Mn defc. acting up...
this makes some sorta sense---> behold Mulders Wheel of Confusion!
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>>> again the bitch with MC is you can't up the needed nutes content w/o piling on the unnecessary extras, which often as not will be detrimental! This can be magnified more so because this is hydro, not soil (different availability behavior with pH, etc.)....
Can you get an EC/TDS reading of your res'? ...Be sure to calculate in the water's base 200ppm as well (that's a bit high in mineral content; consider cutting it with RO/Di to about 100-150ppm)... I would also consider a PK booster (BE would be good at this stage) and a micronutrient supplement (Earth Juice Microblast)....
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Unless you are getting mostly cloudy and amber on the calyxes, you might not be there yet. The trichs on the leaves are usually earlier, and it is the ones on the buds themselves that are the best indicators - you smoke the flowers, not so much the leaves.
Off with her head!. Or maybe flush a week?
...pretty much, yes! I suggested a "complete nute profile" base bloom to help cover what's being lost to reduced MC, but some PK boosters do have micro's and such in them. You can add in kelp (or Earth Juice Microblast, less residues), Si, humic-fulvic (Ful-Power, pure liquid fulvic, again no residues from the insoluable humic portions) on a weekly/biweekly basis to fill in the other gaps,...
....yeah, at 550ppm of actual nutes, that's on the light side,... maybe tick it up another 150 ppm and see if this helps halt the symptoms some...(Have you looked in the GLN section for what other hydro' growers are running?) -- I say "some" because the leaves will still undergo the normal slow fade for this stage. Do you do full changes now and again? I ask because what gets taken in from solution isn't really in equal proportions, plus what the roots themselves are exuding, and an unbalanced level of nutes can be left behind; 1-2 gal of new juice may not restore this well enough over time...
.. they aren't $, a decent unit can be had for about $15...MP is a P and micronutrient availability enhancer, I'm not even sure how effective it is in hydro? In soil, the whole dynamic of nute cycling is totally different,...
I believe your the 2nd to mention that and its great info. Ive always just looked at whatever I can reach to with my lens...so I will start to focus more on the calyxes.Oh, forgot to add on the trich pics... are those sugar leaves? Not the best reference, as I find they turn sooner than the calyxe trich's themselves,... assess trich's on several buds, calyxes only to gauge ripeness....
....yeah, at 550ppm of actual nutes, that's on the light side,... maybe tick it up another 150 ppm and see if this helps halt the symptoms some...(Have you looked in the GLN section for what other hydro' growers are running?) -- I say "some" because the leaves will still undergo the normal slow fade for this stage. Do you do full changes now and again? I ask because what gets taken in from solution isn't really in equal proportions, plus what the roots themselves are exuding, and an unbalanced level of nutes can be left behind; 1-2 gal of new juice may not restore this well enough over time...
TDS is probably OK for now. Unlike pH meters which are easily knocked off calibration, TDS/EC are more robust for holding theirs... But point made, the included cheapie you have may be suspect-
ppp
