So I have noticed before I flip to flower this 3-2-1 works great. The TDS doesn’t really increase in my res. They will grow endlesssly without issue I believe ( I have some over 4 months in veg) using 3-2-1.
Within 2 weeks of flipping the lights, I get cal-mag def and leaves start to wither and fall ( albeit the lower/hidden leaves). It’s only after I flip to flower does this happen.
The res also had to be changed out every fill up, or else the TDS shoots up. I am assuming the plant isn’t consuming something, likely nitrogen, during flower.
Any suggestions with minimal costs to increase the Cal-mag and remove the nutes it doesn’t need during flower, or should I just suplement the cal-mag and change the res weekly?
Seems to me I might be better off changing up the feed instead of following one and done through the whole grow.
Jacks has a modified schedule for flower. 321 gets adjusted to raise the P & K values while reducing the N. Also if your growing under led’s you should be using CalMag throughout your grow imo
It stays relatively the same, I run it at 5.7-5.8. Most of the time I put 5.9 in it and it drops a smidgen.
Once switched to flower for a couple weeks, I have to drain and clean before filling up each time, otherwise the TDS goes insanely high and the PH tries to go low.
Jumping in because of the use of cal-mag deficiency in a singular tense. Calcium in 321 recipe is mainly provided from calcium nitrate (part b) and magnesium is provided from magnesium sulfate (epsom salt). Since calcium deficiency and magnesium deficiency are two different issues, you need to determine which you have in order to address the issue properly. See below for common deficiencies in cannabis.
Additionally, not every issue with a plant is a nutrient deficiency. Sometimes certain elements will become locked out from ph or inappropriate levels of certain elements. Or a larger than normal demand for specific elements due to environmental conditions or excessive levels of other elements. See mulders chart below
Your plants don’t display typical symptom of a calcium or magnesium deficiency. They do however appear to show signs of nitrogen toxicity. Now your ph looks good but crashes and ec shoots up. It sounds like your plants taking water but leaving nutrients. How big is your res? And how much is water dropping at what frequency are you filling or changing? How quickly from reset do you see ph crash and ec rise?
One thing I have experienced this with significantly out of range vapor pressure deficit. But could be anything.
Thank you. I thought nitrogen toxicity was dark green which I am not experiencing.
You bring up several good points. Right now they are in a conditioned space. Tent stays under 79F and warmer than 68F. Typically 77F. Humidity however, ranges around 45%, give or take 10% given the cycle.
It does sound like that to me too, I thought it would be because I am adding to
Much X during flower, which it doesn’t need. I didn’t really consider it could just be drinking more water than nutrients, especially if the RH drops. What’s a good level of RH for flower?
It’s very small, 5 gallons. It drinks about 5 gallons every week.
During veg, all goes well. Only after flip. So say that 5 gallons went in and stayed at 1000PPM and a good PH. When I check it again it’s fine, when I add the missing 2 gallons, it’s a little high on the ppm but fine still. By the 2nd “fill” the PPM will be too high and the PH too low.
You shouldn’t be seeing any major issues at 79⁰ and 45% rh either.
Have you been checking ph and ec/tds before topping off? Like after one day of a fresh res I’m curious what these look like. You could just be dealing with inconsistencies due to uptake and having the small res. If you lose 20% of your water in one day it could be having inverse effect on your ec which could in turn cause swings in your ph. In a hydroponic system it doesn’t take much for ph to cause problems. It’s usually pretty good between 5.5 and 6.0, outside of that things can get shitty quickly.
Those appear to be older fan leaves that begin to die once in flower. I see no signs of C def. Plants will not necessarily look any better as the plants don’t produce leaves in flower.
I use a modified schedule right at the flip. 2-2-2-1.2 with the last ingredient MKP: monopotassium phosphate. Then resume 3-2-1.
If you aren’t running silica, you should.
Normally my harvested plants are still green and vibrant.
