PSA: Check your water temperature!

Hey fine folks! I’ve been chasing a quick moving problem in a Death Scout clone about 3 weeks into flower that sure struck me as a p def, but I haven’t been able to fix. First some context: last round she performed amazing! See First photo. No issues to speak of. That was late summer into fall…not winter like it is now.
Things were going along fine until 2 weeks ago with basically the same treatment as last time - organic grow in 1 part kryptonite (local version of ffof basically) 3 parts lamberts mix 1/2 part ewc. Food is half strength GaiaGreen (all purpose, bloom, mineralized phosphate, insect frass - at various stages) in the dirt and half strength biocanna nutes, fulvic acid, bit of calmag here and there - when she started showing signs of p def. Lower leaves developed that purplish/blue tinge, then blotches (quickly) and yellowing and rapid death. Within a few days it started moving up the plant. I thought ph issues cause the nutes bring it down and j fed close to the start of the problem without letting the solution aerate and bring the ph up - so checked runoff (not that accurate I know) with drops and it seemed right around 7. Tried a slurry test with the strips and realized I might be a little colourblind and REALLY need some proper testing gear….also seemed in the 6.5-6.8 range (my well water comes out the tap at 6.5 like magic). Temp at pot level varies from 16c-22 - a bit on the cool side I know, but not ok cold and at canopy a couple degrees warmer. Then I thought maybe pot size is too small (only in a 2gal fabric pot) and she definitely turned into a 2 gal root brick….so I made a hard call and repotted last night,THEN I realized how Cold my water bucket felt! Since I moved my water out the the shed it’s probably been under 10c when I feed …. I’m dumping ice water down her shorts every few days and she’s gotten mad about it …. I think anyway. I’ll post back in a few days with results from keeping her warmer.
Happy ho ho everyone! Hope it’s a green Christmas for all.

And please correct me if anyone feels I’m missing something!! Here’s the results of the last run. One of em might be key lime pie dosi…they look super similar. Got some major compliments on em both!

Looks like phosphorus deficiency to me as well. However could be calcium. You say a "bit" of cal mag. How much and how many times? What are other sources of calcium in all your gear?

hotrodharley said:

Looks like phosphorus deficiency to me as well. However could be calcium. You say a "bit" of cal mag. How much and how many times? What are other sources of calcium in all your gear?

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Good question! I think you are right on that - sorry failed to mention that in the first place. Haven’t been on top of the calmag for this run. Guy at the shop advised running it through veg and cutting out very early in flower as they will hang around for a bit and are problematic towards the end of flower which I did last time at half strength (seems opposite to what I’ve read and what the bottle says, but it seemed to work). I assumed there would be enough in the Gaia green assortment (and I mixed in some volcanic rock dust - a mineralizer) But I think you’re right. I thought mag at first and gave an Epsom salt spray , but it helped not at all. I have since given a half strength dose of calmag and will prob give another here soon.
here’s some others in the tent who seem happy …