When using thr chart for the ec. Is it in reference to using the trio ff nutes. Or are these the ec when you using everything they have on their chartFeeding once per week at 1/4 strength isn't enough. Your plants are hungry (although the burnt tips makes me question this hypothesis, but that could be a lockout/environment issue... see below)
You seem to be in mid bloom, so as per the feedchart here: https://www.thegrowshow.org/fox-farm-feeding-schedule, 1/4 strength is only 0.75ec or 375ppm. (the chart infers full strength is around 3.0ec). 375ppm is too low for a flowering autoflower, especially if you're only feeding once per week.
I'd bump my feeds up closer to 550-600ppm (1.1-1.2ec), give nutes every other watering, and drop the calmag.
Note, thefeedchart uses the 700ppm scale. The numbers above are based on the 500 scale. Best to go by EC to avoid ambiguity.
Aside from the underfeeding, you may have some sort of P-K lockout going on, but a good course of action there is to just drop the calmag. And is your pH pen good/calibrated? If it's one of those cheap Amazon jobbies I wouldn't trust your readings. Best to aim closer to 6.5 for soil to give you a bit of leeway on either side if your pen is off...
And do you track VPD (temp + RH) at all? Nute absorption is largely dictated by environment... checkout www.vpdchart.com to make sure your temp/RH is in a good range. If I'm feeding my plants poorly and blasting them with improper light levels, they might also show some tip trouble, which would be exacerbated by a bad VPD... Just something to consider.
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I dont know ehat im doing wrong
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When using thr chart for the ec. Is it in reference to using the trio ff nutes. Or are these the ec when you using everything they have on their chart
Thats what I was wondering. If the ec was just the trip or for everything. Do you know the ec when you put yours in? I'm worried about overfeeding them. But if I go by the bottle maybe that won't be a problem. Especially since I've been underfeeding
I have no clue what my EC is! Sorry I’m not of more help there…
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The EC values on the chart are for those specific nutes mixed to 100%. So if it says 2.5-3.0ec for a certain week, it means if you mix up all the nutes for that week at full strength, your solution will probably land somewhere between 2.5-3.0 depending on the quality of your starting water. If you’re only using the trio you’ll probably land closer to 2.5. The bulk of the EC will come from the trio, with all those extras having a smaller contribution to total EC.
For autos, I always aim for 1.0-1.3ec from late veg to harvest. If you’ve been feeding quarter strength till now, try half strength for a bit before taking it any further.
Note, unlike cheap pH pens, cheap TDS/EC/ppm pens are pretty accurate. I highly recommend getting one if you’re going to be using liquid nutes with autos.
As long as you follow the instructions on the bottle and pH before you feed, I think you’ll be okay. Then again, I’m on my first grow so take that with a grain of salt. No big issues thus far though…
Hopefully someone with more experience can shed some light
Thank you so much. That helps a lot. I thought those ec and ppms were for everything there were using but I wasn't sure. And im going to start half strength off bottle every other feeding now and see what happens. I just bought an apera pen that test the ph and TDC because I want to know what's going on. This my first grow and you've all been a great help. I now have a plan so its just time to implement and see what happens. Hopefully they start to look better. Thank you all! I appreciate everything!
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You need to understand salt fertilizers and why you want to use all of a fertilizer line.
www.autoflower.org
Tutorial - A word on Nutrients
The proper use of “salt” based fertilizer to grow Auto Flowering Cannabis. Salts: Natural and man made any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation. Learning how to use salt based...
www.autoflower.org
Thanks! I read the page. A lot of good information on there.You need to understand salt fertilizers and why you want to use all of a fertilizer line.
Tutorial - A word on Nutrients
The proper use of “salt” based fertilizer to grow Auto Flowering Cannabis. Salts: Natural and man made any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation. Learning how to use salt based...
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