Hey guys!
this is my first post on the new site, and my first run of DWC.
I’m running fast buds purple lemonade auto, in a 5 gallon rig, a big 8” bubbler in the bottom, humidifier, sf1000 from spider farmer at about 350 ppfd, ac infinity ai controller and ph/conductivity sensor.
So far so good, my last weeks data is in the first photo with averages of all climate data.
I’m having some success, however; it seems like I’m also having some failure.. my plant has been growing a lot, but I feel like it’s not 100% happy. I’ve had some nutrient burn, some razor curling on the bigger fan leaves. And now some darker clawing new growth.
I’m not sure whether this is a nutrient problem, water temperature problem, or if it’s an environmental issue.
Any advice helps thanks guys, please reach out for clarification.
I’m running 20 on 4 off, and using general hydro stuff mostly. Hydro guard.
also it’s on day 22
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The tips look a little crispy and it is a little small for 22days but not not extreme by any means. What percentage of the recommended feeding doses are you using? Looks like slight N toxicity and maybe some nutes burn. Starting at 50% recommended feeding dose is a good place to start, some strains even 25% is adequate to start with. Also keeping your nutrients phd properly will allow it to feed and help prevent issues. How often do you ph the res? It should be minimum 3 times a day.
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As for the recommended dosage, I have no idea. I’m using this guide from how to grow marijuana. I’ll add the photo. I use all the listed nutes with listed ppm
I’m using the ac infinity ph and conductivity probe to technically I’m monitoring it 24-7. I’ve just ordered a calibration kit to make sure I’m on
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Shoot mang, pH looks decent. PPM/EC looks decent….
@Man-O-Green runs a DWC style system. He’s generally an expert on that stuff. I’ve tagged him so he might stop by with some advice.
I think if you’re getting dark green leaves with tips clawing down then you’ve got too much N.
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Google the GH flora feed schedule, I looked at it for a sec and it doesn’t add up to your feed chart. I would use the GH flora feed schedule from the manufacturer and cut it in half per gal. FoR instance on YOUR feed chart it says to feed 12 ml per gal of Grow, on the actual feed chart it never goes above 8ml and I would cut that down to 4ml or less, depending on the week
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Yeah that was my initial instinct as well, I’m just a hyper analyzer and am afraid to make it worse. I think that’s going to be my conclusion
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Okay can do, I think you’re on the money honestly. It has to be some sort or nutrient issue. My climate has been on point recently minus a few times i forgot to fill the humidifier. I’m going to try and adjust the main additives in my veg juice and see if i can more closely match the recommended dosages, I’ll dial them back as you said as well
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Also just to clarify, that chart represents the 1 gallon of veg juice that I’m adding to my reservoir to reach the targeted ppm, so I’m not adding that much per gallon of res water.
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The companies that make these spend years figuring out these nutrients to work in a specific ratio. If you go by he manufacturers recommended feed schedule and cut it in half you should be good to go. Everything else you are doing seems right on point. Side note, always cut the recommended dose of a product in half, and only go up if you see deficiencies. You can always add more, but you can’t take away.
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That makes sense. I don’t do it that way because I’m in soil. I’ve also spent years figuring out what works for me and my specific water and weather conditions. I have crazy high ppm tap water and refuse to pay for RO lol I also don’t use anything with any added cal mag, as most tap water gets its high ppms from calcium carbonate. We can talk more any time bro. Plus there are others here that know way more than me and probably have more information with the science to back it up. I just do what works for me in my situation, but everybodys situation is different.
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Also continually topping off your res with pre mixed solution will eventually throw everything off because you don’t know how much of what the plants are consuming. You could be adding stuff it doesn’t necessarily need. Over time that can get real wonky. The whole system should be dumped and refilled with new solution regularly. Not every time you feed, but maybe weekly ?
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I just picked up 5 gallons of distilled water to do a fresh red with new nutrients, crossing my fingers lol
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Def looks like N toxicity you don’t want to be seeing tip burn this early.
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The tips won’t turn green again but everything else should correct itself, double check your nutrients if you are using a mix of companies to ensure you aren’t doubling down on any nutrients without realizing it.
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hi @Cart3r249 Before we go on the whack-a-mole nutrient hunt, Are you using PHed hydroton?
i agree that it looks as if you are feeding on the high side but your comment on not filling the humidifier is also suspect. It only takes a few hours at 20% RH or less to cook a plant. anyhow they will survive and be fine!
I don’t think they still use this chart but it worked well for me at 60% for Autos.
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Fortunately my tent never really drops below 45-50% with or without my humidifier, I only use it when the lights are on and the fan is running full swing.
i really don’t know if my hydroton is phed, i bought it at a local hydro shop so maybe? But idk, my ph seems relatively stable, but im not 100% sure about how accurate my readings are. i have some test solutions in the mail that I’ll be able to use to recalibrate soon.
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Always pre rinse your hydroton before use and pH if necessary. Most hydroponic mediums require some sort of wash, soak, ph stabilization etc.
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I have run in to cheap expanded clay the PH was well over 7 and really screwed with the plants. It was impossible to keep the PH in the 5.8 zone.
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Just my thoughts but your dli is low and your vpd is high. Vpd being high can cause your plant to uptake more nutrients causing tip burn and a low dli makes it worse by not having the energy to process the nutes.
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Okay so basically you’re recommending to turn up the light if I’m understanding correctly? And raise humidity?
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