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Are my seedlings growing?

danizeap
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Hello! hope everyone is fine and safe 

Its day 11 for these and they are looking pretty much the same for a few days now. Are these seedlings normal looking for day 11? if not any idea why they have stopped developing? 

 

Thanks! 

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Topic starter Posted : June 11, 2020 11:44 pm
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monkeydo
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If this is day 11 above the soil they are a little behind where I’d expect them to be. Before we can help there are bit of information that will help us help you. What is the media, soil, coco, or something different. What is your watering schedule and input ph. What are you feeding the plant. What light and how close is it, temps, humidity..... and any other stuff you can offer. Diagnosis is better with more data mate. We can get this back on track.

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Posted : June 12, 2020 12:21 am
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danizeap
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@monkeydo Hello! 

More info got it here it goes:

Medium: 40% worm humus substrate, 15% perlite, 20% coco coir, 25% sphagnum moss.  (last time using I have my new seeds in 70/30 coco perlite)

Water: 7 am until the whole medium is damped and a few drops come out of drainage, then repeat at 3 pm. The pH im not sure about since I do not have a pen, but our water is very good, it is award winning for being very potable so I guess its not bad. 

Feeding: I have had a very hard time finding nutrients here in my country, I have already purchased sensi grow coco from advanced nutrients and it will be here soon, since I am growing now on 70/30 coco i need that asap. Now back to the soil planted seedlings I haven't feed them since I figured the medium has good enough nutrients for the first few weeks, then I had planned feeding them the sensi grow as well when it arrives, is there a problem to feed sensi grow coco to soil based mediums? 

Light: 16/8 light cycle with 300w LED blue and white light at 35 cm distance.

Environment: They are situated in a growing tent with a fan gently disturbing them for stronger stems, them temperature is at 19 celsius and RH at 65%.

The 2 biggest ones have 11 days, the rest are at 7 but they are super similar so thats why I thought there might be a problem. Also are they super stretchy? 

 

thanks!

 

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Topic starter Posted : June 12, 2020 3:27 pm
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monkeydo
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@danizeap your grow media should be considered soil as it has 40% worm castings with peat and coco. This is going to be very different than growing in 70/30 coco perlite. In a soil mix you should saturate the soil till 10 or 20% runoff. Because you have nutrients in the mix, the worm humus, you should alternate your watering schedule between feed and ph correct water and you need to let the soil dry out some between watering to encourage the roots to grow healthy and strong. If watered correctly you should not need to re-water your seedlings in the afternoon and even be able to skip every other day right now when they are small. Letting the soil dry some between waterings will encourage the roots to look for moisture and spread increasing the growth rate and plant vigor.

As for the stretch, try lowering the light a few more cm and see how they like it. 35cm seems close but if they are stretching they need more access to the light. 

The high background EC in your water is going to keep the growth rate slower as well. I believe this is the biggest part of the problem. A background EC of .600 is very high. You can bet that this high background level will slow the growth rate of your plants. For calculating purposes you can more or less ignore the background up to about .300 but the rest of that has to be factored into your feed so before you even begin, your water has .300 EC that your plants cannot use. As confusing as this sounds, even though you are only using .400 for nutrients the load on the plants is .700 because of the background. This means the plants work much harder to get the nutrients and water it needs to grow. Seedlings are not strong enough to grab nutrients efficiently at this high EC. Can you get some other water to help lower the background EC level? I use rainwater, it’s the best but not everyone has access to it. You can add distilled water to your tap water to lower the background to .300 and that will accelerate growth. Better water, how ever you get it, will really speed growth. Once the seedlings grow a stronger root system they will process the nutrients easier but a lower background EC would really be the best long term solution.

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Posted : June 12, 2020 4:21 pm
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danizeap
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@monkeydo thanks! 

I am a bit lost with what EC is, does it have to do with ppm? Soon I will have an RO water source installed just need to have someone come and do the installation I already got the system, will that help? 

 

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Topic starter Posted : June 12, 2020 8:57 pm
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RedEyeJedi
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@danizeap Hey man, I can answer half your question for you as I had the same original query as you. PPM and EC are the same however just worked out differently. Ive copied the formula below incase you need to change PPM to EC. Hope that helps

 

To get an EC value, multiply the ppm reading by 2 and divide by 1000. Thus, if your ECis 1: 1*1000/2= 500 ppm.

 

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Posted : June 12, 2020 9:02 pm
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danizeap
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@redeyejedi Amazing! 

Ugh I love when I can math shit out lol 

thanks! 

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Topic starter Posted : June 12, 2020 9:07 pm
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@danizeap Just don't smoke a spliff before you try and work it out and then you should be fine lol

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Posted : June 12, 2020 9:10 pm
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monkeydo
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@danizeap I actually like that advice about smoking and posting as reading back through the thread I answered half of someone else’s questions here. I’m not good at multitasking today obviously. The entire EC instruction was specific to a different question elsewhere, must have messed up with my tabs there. Sorry about that 🙄

 You said your water is good and you are adding a RO unit. That will be brilliant mate, the girls will love it. Some type of ph meter is highly recommended though as cannabis grows best in a specific ph range. Tap water is usually above 7 in my area, closer to 8 even. In coco the input should be between 5.8-6.2 and for soil somewhere around 6.5 . If the ph is out of range, even with RO water, the plant won’t like it and grow more slowly than it should. Every grower will tell you that a ph meter is an absolute necessity. The Sensi Coco nutrients from Advanced Nutrients are ph balanced for growing in coco. I use that line right now and my res usually ends up around 6.0 with rainwater or RO water. That’s a little low for a soil grow but it won’t kill your plants. If that’s what you have try it and see if they respond. If they don’t like it you can always raise the ph with a ph up material. For right now the lower light and ph balance your water should help the seedlings. When you get the nutrients start feeding every other watering at 1/4 the recommended rate on the bottle. Sorry about my confusion earlier, one question at a time from now on 😂

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Posted : June 12, 2020 9:45 pm
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danizeap
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@monkeydo lmao!

Its ok thanks every bit of info works! Yes Im well aware how important pH is and I will invest in a pen, on for pH and one for ppm. Since this is all new for me and the investment is significant I am taking it one step at a time, specially because shipping stuff from the US is very expensive so one shipment at a time. 

Thank you so much for the info!

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Topic starter Posted : June 12, 2020 9:52 pm
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TempleGrower
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@danizeap

How is your high school chemistry? Haha.. So, both PPM and EC are different ways of measuring the Total Dissolved Solids (TDS) of your solution. They are very related but not the same. Essentially, when you add your nutrients to your irrigation water, those nutrient compounds dissolve (break apart) into their ionic forms (think like dumping table salt into water - the salt dissolves because the polarized (i.e., electrically charged) water molecules, H2O, literally pull apart the weakly bonded NaCl molecule into its charged (aka ionic) components - Na+ and Cl-). The same thing happens with any salt- or ionic-based fertilizers, powdered or bottled (in bottled nutes this has likely already been done for you as they are mostly made of water 😉). When these ions are dissolved in water, it increases the ability of the water to conduct electricity as all the different ions the plants crave are now in solution and available - Nitrogen in the forms of ammonium and nitrate (NH3+ and NO3-), Phosphorus in the phosphate form (PO3-), Potassium as potassium (K+), Magnesium as magnesium (Mg+2), Sulphur as sulphate (SO4-2), and so on. In these forms they are ready to be absorbed, and the total of these values is the EC measurement. Plants use electricity, fundamentally, in order to absorb and exchange these ions in order for them to be able to be used, so, that's why EC is important.

TDS goes a bit further, and is a conversion of the EC value into a value that's more easily understood by everyone, but tends to be less accurate.. different conversion factors and what not.

A high background EC or PPM reading can definitely make things difficult, as most of what is dissolved in your tap water is likely not what you want to feed your plants - sodium, calcium, iron, who knows... and can definitely cause issues with nutrient uptake, pH, and just not knowing what your plant is really eating. Kinda like trying to paint a picture on a canvas that already has a bunch of shit scribbled all over it. Your picture is probably gonna have some issues, no matter how good of an artist you might be.. lol.  If you can get a water test, or maybe your city has an annual report they publicize to the residents or something to see what you might be dealing with, that would be helpful. But yeah,  RO will definitely help that issue regardless - just make sure to get a good system and keep your filters clean!

Hope that makes it a bit less confusing... 🤓 

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Posted : June 13, 2020 5:42 am
Stootie, monkeydo and Fish liked

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