Is my substrate good enough ? Do I have to feed my substrate ?

A good heuristic for you to start implementing is this: - anything you do to soil is going to take at least a week to show the subsequent impact of in the plant - the current bioavailable food load in the soil for the plant (living web) is going to be approx. 3 weeks of nutrition This means that generally folks in living webs have at least an amendment every 3 weeks, typically only a sugar input for the microbiome to feast on...keeping it healthy...so that the effluent streams from the microbiome continue to line up to make a bioavailable buffet for the plants... You're always feeding the soil web with this lead time. Keep this in mind if you are a flusher.... This means that ceasing feed in a soil web for the microbiome could logically be as far as 5 weeks from harvest.... Same type of heurisitic is why cover cropping for soil health only really makes sense on 20+ season grows

Feeding the plat vs feeding the substrate is a method of how you want to grow. Feeding the soil is common with amendments like guanos and compost, Feeding the plant is common with hydro like setups. the main difference is all the things you feed when feeding the substrate need to be broken down by the microbes and when feeding the plant directly its 100% plant available nutrients that need no extra steps, they say this is bad for soil health long term but its in a pot and should not matter. plus indoors its cleaner and less smelly then some amendments. your substrate looks fine in term of composure, how you want to feed it is up to you.

In my opinion your substrate looks good! Porosity is important to allow for ample drainage and space for root growth, and your perlite and coco in the proportions seem like they will achieve that. The guano will certainly help your plants get some nutrients, but often slow release nutrients can be delayed in supplying what your plants need, may fall short of total needs. With regard to supplying water soluble nutrients, I would--I see you are using some other Bio-Bizz products, and they recommend adding nutrients after you get 2-4 true leaves. That being said, I would start low (1/4 of the dose recommended on the container for standard fertilizers, or follow the feeding schedule if it is a cannabis fertilizer as they will tell you the lower dose you need) this week, then 1/2 dose next week, and then maybe 3/4 or full dose after that. However, if 5% or more of your substrate is guano, I would watch your plants for signs of nutrient burn, and if you see that, back off to a 1/2 or 3/4 dose. Here's an interesting article on early nutrient use: https://www.gardenmyths.com/when-fertilize-seedlings/ With regard to what fertilizer to use, it's up to you, but most plants grow well with a 3-1-2 N-P-K ratio (and keep in mind a fertilizer that says 24-8-16 is also a 3-1-2 as it has the same proportion of nutrients and the bottle recommendation will just tell you to give a smaller volume). If you want a simple solution, I am using Gardenwise Snakegrass 3-1-2 (keep in mind there's no such thing as a plant specific fertilizer as the nutrients are the same) for my Fruity Freak 2 grow and I will use it all the way through flowering. This article talks about the 3-1-2 nutrient ratio: https://www.gardenmyths.com/best-fertilizer-indoor-plants-containers/ However, there's going to be many ratios that work well. This Israeli summary highlights a bit of that: https://israelagri.com/advances-in-science-based-fertilization-technologies-for-medical-cannabis/#:~:text=optimal%20nitrogen%20level%20at%20the,concentration%20of%20cannabinoids%20and%20terpenoids Anyway, hope this helps, and happy growing!

Zum Starten reicht es erstmal, aber sobald du in die Blüte kommst oder Photos über längere Zeit in der vegetativen Phase hast must du dünger dazu geben. Ich empfehle dir das du keine teuer Grow dünger brauchst/kaufst es funktionieren die ganz normalen die man im baumarkt/Supermarkt oder Gertnerei bekommt. In der Vegetative Phase brauchst du einen der mehr Stickstoff (N) hat und indem Blüten Phase eine mit mehr phosphor(P) und Kalium (K) ich habe diese beiden mit den Werten für Vegetative 10-4-7 und für Blüten 3,5-6-6 und gebe noch etwas PK von Canna dazu der 13/14

Light mix has ec of around 1.2, enough to get you through the first couple of weeks, but when the veg workloads kick in, she will need supplementation. How long exactly depends on how fast she uses up the nutrients in the soil, so it's a "how long is a piece of string" kinda question. EC is a measure of electrical conductivity in a medium; it indicates how many salts there are in your medium, and is measured in millisiemens per centimeter (mS/cm) or microsiemens per centimeter (µS/cm). Cannabis thrives in ec range of 0.3 to 1.8, anything over 1.8 will begin to cause problems. Best advice would be to get yourself an EC metre designed to be used in the soil, feed a balanced fertilizer suitable to the stage of growth, and apply the desired ratio of salts, making sure to never exceed 1.8 EC The plant won't use all the salts you ad to meedium, so each time you reapply new salts you need to make sure its not peaking over 1.8 and if it does then you need to leech and reset your medium, which you want to try to avoid if you can, the less accurate you are with application of ratio the more unused or unneeded you will have over time. Good luck. If you really want to simplify things. NPK industries GROW 7-4-5 RAW GROW is a tested blend of all 12 RAW Soluble plant nutrients, essential elements and supplements. This blend has been proven to be an optimal all-in-one base “Grow” horticultural fertilizer. RAW GROW is used throughout the entire vegetative stage. Derived from: Plant protein hydrolysate, mono potassium phosphate, potassium sulfate, cane molasses, sodium borate, copper sulfate, iron DTPA, magnesium sulfate, manganese sulfate, zinc sulfate and azomite. Also contains non-plant food ingredients: Humic acids derived from leonardite and peat, kelp (ascophyllum nodosum), silicon dioxide derived from diatomite and yucca extract.