Hello,
I have these yellowing tips that have been progressing on 2 of my plants (from 3, one has very slight signs of it). Plants are almost 5 weeks old, they broke ground on 12th December. 3 FastBuds Autos from a mix pack in 70/30 Coco/Perlite. Feeding Advanced Nutrients Week 3 (I should be on Week 4 which is full strength by now but I’ve been holding back in case what I’m experiencing is nute burn). EC 1700 / 850 PPM. The plant on the left and the middle one have started pre-flowering. The yellowing is on the left and right plant.
Full tent:
Left plant pic 1:
Left plant pic 2:
Right plant:
Since the left and middle plant have started pre-flowering, but the right one hasn’t yet, should I be switching to Bloom nutes now? I’m using an automated watering system which I finally installed this grow, should I be feeding twice at this point?
Thanks in advance for any help.
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Those yellowing tips resemble the threshold for nutrient feeding. I get this with every grow and don’t worry about it as long as my PH, lighting and environmental conditions are in range. I’m not a big fan of PK boosters if my base PK ratios are balanced. With that said I have tried modifying my base NPK to feed more PK during flower and honestly didn’t see any significant return. If you choose to use the PK boost I would start around week 1 of flower thru week 3 then return to your normal base nutrient feeding 
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I’m running full line AN Sensi Coco recipe. At half strength it’s 850-900ppm and I get a little tip burn from time to time as well. I did run into my runoff getting up to almost 1500ppm and did a flush with 800ppm nutrient mix until the runoff was back down to below 1000ppm. It took about 5 gallons to flush 1-5 gal pot. I also run an automated drip system the feeds 3 times per day to runoff. My runoff is only about 3 quarts per plant, per day after all 3 feedings. That’s what I attribute the build up in the Coco to be. I don’t think my emitters are saturating the Coco as well as when I feed by hand. I have 2 emitters per pot right now, and I’m going to change that to 4 emitters per pot to distribute the feed better.
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Halos may work better for you on future runs, could work for you now just depends on your stalk thickness
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I had them in my Amazon cart, but yes, by the time i got my setup running, my plants stalks were pretty big, so I went the emitter route. I’ll probably use them on my new seedlings once they get big enough to feed.
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Hello @OGIncognito thank you for your reply, so you’re thinking it’s nute burn, even though there is some clawing?
I am not using PK Boosters. The Sensi AN Line I use has 2 different bases depending on the stage the plant is in. Sensi Grow for veg, and Sensi Bloom for flower. Just wondering if I should be switching to the Bloom base now.
@OldNailPounder I have the hydro halos, they do provide better water distribution than the emitters as I see a whole ring of water around my plants. I still handwater once a week though (with what stays at the bottom of the rez which the pump can’t bring up) just to ensure I’m periodically moistening all of the coco where the halos could have missed. I used the cocoforcannabis diy autowatering system guide as a base. It is very informative.
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Yes some slight burn and clawing is also a symptom. Your feeding numbers are almost identical to mine, what’s the run off PPMs and PH and frequency of feeding in that 70/30 coco and perlite
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Thanks again @OGIncognito, my runoff numbers per plant are:
EC 862 / PPM 431
EC 802 / PPM 401
EC 1021 / PPM 511
pH 5.4 - 5.5
I’m feeding once a day, set it up for twice a day just now.
The runoff numbers are seeming low when I’m feeding EC 1700 / PPM 850. How come they’re getting nute burn if the runoff is so low?
Could it have anything to do with this extract I had read on cocoforcannabis:
‘Distribution of water is rarely a concern when hand-watering. However, with drip irrigation systems that apply water in only a few specific locations it can be possible to get run-off without saturating the media. The water will follow well worn channels through the media and end up in the saucer even while regions of the media remain dry. The run-off EC in this situation is usually low, but the EC of the water available to the plant is spiking due to the concentration of salts in the drier regions. A plant that experiences nutrient burn despite low run-off EC is indicative of a water distribution problem.’
‘Finally, it is a good practice to periodically hand-water which always ensure a complete saturation.’
I handwater once a week, and have only been using the watering system for almost 3 weeks now.
Humidity is 60-70% in case it makes a difference. I’ll be bringing in the dehumidifier soon when the little one starts flowering.
Thank you for reading.
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@MagicCultivator420 , @OGIncognito , I ordered the Halos for a run of 4 Autos that are only about 4 days old. I have three in preflower in another tent, and if they will still fit around the stem, I’ll order 3 more. And I like your process with feeding by hand once a week. I’m going to start doing that as well.
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I see. So should I increase feed strength although they’re getting the tip burn? I’m currently feeding 3ml p/ltr of the base NPK which brings me to around 1700 EC. If I feed 4ml p/ltr this comes out at around 2000 EC. According to AN’s feed chart, I should have been on 4ml around 10 days ago, I just held back cause of the tip burn.
Awesome! I think you’ll like them. I’m quite happy with mine. You’ll be able to easily fit them over the plants till they’re about 3 weeks old with no issues.
It makes sense in theory, I liked the concept of it when I read it also. At least you know that all of the coco is getting comletely saturated weekly.
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