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Grow QuestionsVexatious yellowing I can't get to correct.

Vexatious yellowing I can't get to correct.

LeastExpectedGrowerstarted grow question 3 years ago

This Northern Lights auto is being vexatious...I can't get rid of the yellowing towards the bottom. Not overwatered, I've tried beefing up the nutrients, etc. with no effect. Any thoughts or do I just writing off as she's just being a jerk? Other plants in this grow are fine.

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Week 9

Leaves. Color - Yellow

WeGroanswered grow question 3 years ago

OK dli is good, 60 is max.. but, if the dli is given to intense (to close light) the leaf turn upwards like yours, so you might back light a little. 4-7 cm? problem with ppm is that is no standard definition of it. sometimes 700ppm =1 ec. sometimes 500ppm =1 ec?? its just a mess. it depends on your reader. So anyway, i dont know how much 500-800 ppm is. You should however be between 1.2 - 2 EC for soil flowering. make sure you measure the run-off water.. if its a lot less then what you feed them, they need more nuets. (EC target need sometimes even go up to 2.2-2,6 ec ... if strain demands, typical indica to need much and sativa little.. or if you are doing hydro/coco that also needs more EC.) Anyway about your nuets,, i read only 1/2 strength nutrient and that's not good. I too use GHE tripart, their seedling feed where spot on EC-target. (with my water). I think GHE have good ec targets in mind when design feedchart, but of course your water quality also plays a part.. but i would just go full strength mate. atleast for 2-3 watering and see what happens

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LeastExpectedGroweranswered grow question 3 years ago

Cool, thanks WeGro. Updated a few things below. Most likely my PPM (my meter reads the EC as twice the PPM) was a little high on runoff though hard to pinpoint what it was now given time/evaporation. I did flush the soil pretty well and is reading .7EC after the flush. I did re-feed, but kept it to 1/2 strength but will bump it up moving forward. Still a bit leery there, since I've just seen a ton of people saying that Autoflowers are good for ~600ppm in flower for feeding and most people talk 1/4-1/2 range compared to standard photoperiod plants.

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LeastExpectedGroweranswered grow question 3 years ago

Whelp, I didn't have any fresh runoff from my feed earlier today but I did get some of the older stuff that was left in the bottom of my saucer (read that as partially evaporated), and the readings were high, in the 2600 range, but again, that could have partially been because it was runoff that was evaporating for a good 4 hours. Decided since it was 'feed/water' day anyway, it wouldn't harm much to do a good flush on it. Poured 4 gallons through and it read back down to 365ppm on the tail of that runoff. Did do a half strength feed on the backside of it, with 660ppm. I also brought the lights up a bit, hitting around 650 ppfd now which still should be solid if light was indeed an issue. The others can wait it out until their soil dries, and I'll make sure to give them a good flush too just in case.

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LeastExpectedGroweranswered grow question 3 years ago

WeGro, I'd always read to go light on feeds for Autos, but I should hit them harder, past 600ppm total (seeing that my water starts at just over 200)? I can bring my light up too if needed, i'm sitting ~800PPFD at the top of this plant and the DLI is right around 50. All the plants are under the same conditions, this seems to be the one having trouble.

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WeGroanswered grow question 3 years ago

You should measure your runoff water and not necessarily put emphasis on the water you feed. of course both are important. now you want full nutrient strength nutrient, so the ladys can pack on some meat. so you should most likely not be feeding the plant 1/2 strength nutrients, that's not good in semi-late flowering. You can do 2 more weeks with full strenght nutrients and then 1 last week with just plain ph'd water. also fyi. Your plant also shows sign of light-stress, curled/pointy upwards leaf's. The leafs should not look like a saw.

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LeastExpectedGroweranswered grow question 3 years ago

@MrStinky, Not so sure. Just had its first orange pistils showing earlier this week. Seems like the Calyxes are really just starting to develop?

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MrStinkyanswered grow question 3 years ago

It is coming to the end of its life mate - at this point the plant is finding it easier to digest its own leafs for nutrients than take them from the root zone. Totally natural at this stage and you orobably have a week or 2 left on it

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LeastExpectedGroweranswered grow question 3 years ago

Additional details: Tent grow. Soil (slurry is pHing at 6.6), water is pH'ing to 6.5. Every other feeding/watering schedule to runoff. It ends up being feed/wait/wait/water. Well water PPM is ~225 adjusted and feeding PPM is ~550 (total, not subtracting water PPM. I don't think it's a cal/mag issue but I do add some every few feeds just to be sure. Using GH Trio, at 1/2 strength, then further watered down to get the PPM to about 550.

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