biggiegallz
Active Member
Quick question. I'm at day 21 since flip and over the last 2 days the runoff ec has spiked. From 1.8 to 2.1. Input is 1.7. Is it time to start lowering N or what's the next step?
Runoff ec spiking
- Thread starter biggiegallz
- Start date
biggiegallz
Active Member
Awesome thanks mate. So Nitrogen would be the thing to back off right? I am currently feeding 100ml of each of these per 100L of water. So less base nutrients would be the go? I'm in coco and have heard I need to use calmag the entire grow so didn't think that was an option to drop
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biggiegallz
Active Member
Temps have been getting up to around 30C a few days bit mostly around 26C during the day and 18C at night. I water 3 times a day to run off. 8 plants get 100L combined over 2 days so roughly 6.5L a day each
biggiegallz
Active Member
Okay, I'd just been told to back off Nitrogen at the end of the stretch period which has just happened so assumed it must have been getting too much N, as I've fed this exact mix for the last 10 days with no runoff issues. Not sure how true that was hence why I'm asking here hahah
biggiegallz
Active Member
The feed chart I use raises the base nutrients in flower which is the N. I use the house and garden feed chart but I don't use the recommended of the base nutes as that makes the ec around 4.0 hahahaha. It seems to be way out. I just lowered base nutrients and kept the others to what the chart specifies. Says I should use around 300ml of base nutes in my 100L tank but I only use 100ml of base nutes. So it's I can lower calmag and that won't affect it? I wad just told I need to feed the whole grow and the bottle says feed 100ml all through flower so maybe take that to 50ml and keep the rest as is? I have a pic of the nutes just above. Plants look good but starting to get slight nute burn on a few leaves
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biggiegallz
Active Member
Coco. So you don't change anything ever? They get the same nutes week one to week 8 sort of thing? Like same ec and everything?
Star Dog
Well-Known Member
No of course I change the ec accordingly, as matter of fact I use the run off as a guide to ec.
Idk why anyone would recommend lowering nitrogen with a full profile nutrient?
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TCH
Well-Known Member
If your runoff is higher than your input, than chances are that you have some salt buildup. It sounds like it isn't ridiculously high so the plants probably aren't suffering yet. I dealt with a big lockout issue and my runoff ppm/ec got crazy high and the plants suffered. What I would recommend is to mix up a batch of fee that is lower than what you are feeding normally. Like half. Flush the media until the runoff is back lower than what you are normally putting in and then resume feeding as normal. I would adjust your feeding to give a little more runoff to make sure you are flushing the media each feeding to prevent future salt buildup.
biggiegallz
Active Member
biggiegallz
Active Member
Damn thats impressive. How did you get them.so massive hahaha what does full profile nutrient mean? From my understanding he was meaning lower the N so I can add P without it raising the overall ec but not entirely sure. Also what are those white tunes you have hanging?
TCH
Well-Known Member
1. You are in coco, right?
2. How many pots?
3. What size pots?
If you are flushing the pots, they should get to a point where the runoff is the same as what is entering. My guess is that your pots are too big or there are too many of them and flushing them with the 1.7 EC was not enough with just 40 l.
biggiegallz
Active Member
Star Dog
Well-Known Member
If you're using a coco or 3 part nutrient all the essential elements are available, it's not possible to drop drop just nitrogen or any other mineral.
For future just use the same nutrient diluted back each time, when you get to the same out/in feed it with fresh nutrient.
Your ec rises for a few reasons, one is environment, a hot dry environment makes plants evaporate more water, this increases the ec because nutrient is concentrated through water loss.
Or you aren't allowing enough run off, run of is essential for the reason above.
(You can get away without it for a short period we know that but just do it)
Plain feeding too much, the plant can't hse what you give it so it keeps building up until theres issues.
How do i get them so big lol treat run off like a religion
Eta...
The things hanging down are temp probes/guards and data logger.
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biggiegallz
Active Member
It has been getting hotter in there so maybe water more each time?If you're using a coco or 3 part nutrient all the essential elements are available, it's not possible to drop drop just nitrogen or any other mineral.
For future just use the same nutrient diluted back each time, when you get to the same out/in feed it with fresh nutrient.
Your ec rises for a few reasons, one is environment, a hot dry environment makes plants evaporate more water, this increases the ec because nutrient is concentrated through water loss.
Or you aren't allowing enough run off, run of is essential for the reason above.
(You can get away without it for a short period we know that but just do it)
Plain feeding too much, the plant can't hse what you give it so it keeps building up until theres issues.
How do i get them so big lol treat run off like a religion
Eta...
The things hanging down are temp probes/guards and data logger.
nxsov180db
Well-Known Member
In my experience your runoff is always going to be higher unless you're under feeding or watering to some insane amount of runoff. I checked my runoff last night and it was 4 point something, feed is 2.6. Some commercial growers purposely charge up the medium with dry backs. Athena wants you to soak the coco in 3.5-4.0 before even transplanting. I wouldn't worry about a 0.4 difference from feed to runoff.