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How to grow in Coco: Feed schedule

d42zero

Well-Known Member
Quick update, watered at lights on last night with 1.5L nute solution split between the three plants, ended up with a tiny amount of runoff from two of the three.

Runoff isn't an issue for me as I have my plants in trays but up on trivets, so there's a ~30mm gap between the bottom of the pot and the tray as you can see here:

Here's a photo of the leaf yellowing/browning, this is plant #1:

Plant #2's leaves are curling down a bit, different to the others:

And plant #3 (the one that struggled to push its seed husk off) is probably the healthiest looking of all:

And here's a photo of the full setup, 315W LEC in 1200x1200 tent, with a humidifier and a tower fan:

Min/max temps at the top of the tent (not under the lights) are 18degC-25degC, RH is 50%-70%. The smart pots full of coco must be pumping a ton of water into the air, humidity was 25-35% at seedling stage (which is why I bought the humidifier) but now I'm actually having trouble keeping it below 80%. I currently just vent the air into the room and allow it to recirculate, but now I've transplanted to the big smart pots I have to open the room up a couple of times a day to keep the humidity down! I'm going to look into getting either a dehumidifier that I can vent out the window, or a portable reverse cycle a/c unit.. I've been wanting to buy one for a while now and since it's winter here I should be able to get one nice and cheap :) I can vent the tent air directly out the window, but being winter I feel like I'm probably better off venting the heat from the lights back into the room. An A/C or dehumidifier will vent air out but won't do it constantly, which I think will make it easier to keep those temps up in the 20s.

This should be my last long post here, sorry to hijack things! I'll go and start up a grow journal and link to that if I need anything more.

Thanks for all the valuable info so far in this thread, it's fantastic to read through!
 

tokeycones

Well-Known Member
Hey man, Just wondering when going off the ppm are you using the 500 or 700 scale ? and my nutrient range is very different i can't seem to find anything similar in my country. These are my numbers for week 4 in coco you any tips or suggestions would be great.
 

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d42zero

Well-Known Member
Hi again,

The 500 / 700 scale question applies to me too.. my TDS meter arrived today, but now that question has popped up I don't know if I'm getting the right readings. EDIT: this link seems to say that 'TDS' refers specifically to the PPM500 scale.

With the meter straight out of the box tap water measures 141ppm and my current nutrient solution (week 3 from the GWE schedule) measures 690ppm which seems to be in the wheelhouse, although there is a lot of cal-mag in that mix. Should I add a tiny amount of cal-mag to get to 150ppm then add nutes at the ratios on the bottles aiming for 600-700ppm, or just keep going on the ratios I'm currently on? Adding less cal-mag would mean there's a higher percentage of nutes at the same PPM reading which I imagine would be better?

The meter also gives an EC reading but it's in microsiemens per centimetre (μS/cm), tap water reads 300 and nute solution reads 1504. I guess that translates to 0.3 and 1.5 siemens per centimetre which seems to be in the wheelhouse if I'm scaling correctly, and an online converter tells me that's 150 and 750ppm so I guess that backs up the idea my meter is measuring in PPM 500.

Anyways in terms of real world stuff the plants themselves look and seem incredibly happy since transplanting into the 5gal smarties, they've all grown at least 50mm (2") in the past 2-3 days :D

Cheers
 
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kentboy1296

Well-Known Member



I'm sorry I've not got the photos sorted cos now I can't show you my set up but I've noticed the roots have largely reached the bottom of my Solo Cups. I've got 5 x 3 gallon fabric-ish pots to transplant some into that came with the Growlush set up, so I've transplanted one of the seedlings into one just as a test run. But I'll need to do another 10-15 in a coupla days cos I need enough to fill both tents (12sq feet. & a 24sq feet) after culling males. I'll forget the Perlite this time cos you advised me to. But may I ask you what pots I should use, please? I'm thinking either recyclable hessian shopping bags (cheap) or square buckets with lots of holes cut out (by myself)? I've been offered the loan of 5 pots with bubble holes (some name like that) manufactured especially for growing pot in. I've got 5 ring drip feeders and a pump for one tent. But I'm liking your idea of watering/feeding once per day by hand for this first grow so I can get a feel for it more. And like today, I tried to water just enough to moisten the medium with very little run off and hoping to have them dry enough for another feed tomorrow. I think that is your system?! Honestly, I've had SO many kind people advising me online but so much contradictory information that I'm now gonna just stick with YOUR program! It makes sense to me, I guess.
& btw - if you can see one of the pics, it's the silly Growlush thingy I bought...just so you know what I'm talking about.
Thank you!! I was a pretty nifty outdoor grower 20 years ago, as we have ideal weather down here but the market has changed. I lived in Amsterdam for a year 18 yrs ago and saw some amazing grow ops there! But whole different scale to my little tents.
Hey mate, whats the name of that grow system there i REALLY like it
 

Amy Gardner

Member of the Month: March 2018 - Photo of the Month: April, Dec 2018, Apr 2019
Hey @Cultivator - just wanted to jump in here and thank you for this thread and also everyone else for contributing and asking questions etc. I’m just starting out in Coco and have found this thread and excellent resource. (Up to page 30 something...)

:thanks: :Namaste:
 

Dirlewanger1945

New Member
Hi Cult, first off thank you! I have found this thread to be extremely helpful. I have a couple of questions. I’m pretty sure I have the right idea but I just want to make sure.
1. My water is city RO with a PPM of 0 to 10. Do I add 140ppm of cal/mag to total 150ppm?
Or just add 150ppm of cal/mag?
Then add equal parts of PH perfect MGB? For example 600ppm = 200ppm micro, 200ppm grow and 200ppm bloom? PPM wise they are equal but volume wise they would not be equal parts.
2. I’ve read this whole thread all 70 pages. I don’t think you mentioned foliage spray.
Do you use a foliage spray? What do you use? What concentration?
Thank you so much for your help to all of us.
Growing Do Si Dos 1 plant
Coco perlite mix 70/30 pre buffered
PH for feeds varies 5.6 to 5.8
450w viparaspectra LED
Temp 22.5c days to 19c night RH 70 to 80Day 50s at night
Plant is week 5 in veg
Advanced Nutrients PH perfect MGB
Advanced Nutrients sensi Cal/mag xtra
I currently mix 1 gallon of feed at at time and water 2x per day. 1 litre per water.
Thanks again
 

The Bard

Well-Known Member
Hi Cult, first off thank you! I have found this thread to be extremely helpful. I have a couple of questions. I’m pretty sure I have the right idea but I just want to make sure.
1. My water is city RO with a PPM of 0 to 10. Do I add 140ppm of cal/mag to total 150ppm?
Or just add 150ppm of cal/mag?
Then add equal parts of PH perfect MGB? For example 600ppm = 200ppm micro, 200ppm grow and 200ppm bloom? PPM wise they are equal but volume wise they would not be equal parts.
2. I’ve read this whole thread all 70 pages. I don’t think you mentioned foliage spray.
Do you use a foliage spray? What do you use? What concentration?
Thank you so much for your help to all of us.
Growing Do Si Dos 1 plant
Coco perlite mix 70/30 pre buffered
PH for feeds varies 5.6 to 5.8
450w viparaspectra LED
Temp 22.5c days to 19c night RH 70 to 80Day 50s at night
Plant is week 5 in veg
Advanced Nutrients PH perfect MGB
Advanced Nutrients sensi Cal/mag xtra
I currently mix 1 gallon of feed at at time and water 2x per day. 1 litre per water.
Thanks again
I haven't been by this thread in a LONG time, but I still remember how helpful it was when I was starting out back in the winter this year.

I am using RO as well, in coco, with LEDs. I found in my last grow that I needed to run Cal/Mag at higher levels than shown here - about 0.4 EC, which is 200 PPM. My suggestion is that you take whatever PPM your RO is showing, and call that zero. Then add your various nutes accordingly. So for the question you asked, if your RO is showing 10 PPM, and you want 150 PPM of Cal/Mag, then I would target 160 PPM. Make sense?

One other comment, although you didn't ask. I think your RH might be a little high in the 70-80% range, since you are now well into veg stage. Temps look great, but would shoot for something more like 50-60%. Once you get into flowering, I think that you will want to get that down well below 40% towards the end of bloom cycle, just to avoid any risk of mold.

Hope that helps a bit!
 

Dirlewanger1945

New Member
I haven't been by this thread in a LONG time, but I still remember how helpful it was when I was starting out back in the winter this year.

I am using RO as well, in coco, with LEDs. I found in my last grow that I needed to run Cal/Mag at higher levels than shown here - about 0.4 EC, which is 200 PPM. My suggestion is that you take whatever PPM your RO is showing, and call that zero. Then add your various nutes accordingly. So for the question you asked, if your RO is showing 10 PPM, and you want 150 PPM of Cal/Mag, then I would target 160 PPM. Make sense?

One other comment, although you didn't ask. I think your RH might be a little high in the 70-80% range, since you are now well into veg stage. Temps look great, but would shoot for something more like 50-60%. Once you get into flowering, I think that you will want to get that down well below 40% towards the end of bloom cycle, just to avoid any risk of mold.

Hope that helps a bit!
Thanks for the reply Bard, it does make more sense to me. About the humidity as soon as I turn on the bloom side of my Led it will burn up most of the daily humidity. I will also start running my exhaust fan 24/7 to keep the moisture down.
Thanks again
Cheers
 
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