Friends please help me in fertilization. I am in Iran and unfortunately here are no special brands for marijuana and I bought a 20-20-20 npk fertilizer. I put a few photos of this fertilizer and you guide me and tell me how much to use it for each plant? I have planted my flowers at different times and for that reason, their size varies from 30 cm to one meter and 30 cm but they are all during growth. And most important are 9 to super silver haze, which, unfortunately, they are almost small, please tell me what dose of 20-20-20 powder to give them?
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make sure if you use this stuff not to get any onto your plants cause it will burn and don’t get it to close to the plant when you do use it. stay about 4 to 5 inches away from the stem.
Plants can’t exactly pick & choose what nutrients they take up much better than you can separate clean water from pollutants…
Plants have specific needs at specific stages, the closer you can match your nutrient availability to the plant’s needs, the healthier it will be… Since they can be partially selective though, unused salts/nutrients will build up in the soil increasingly with each application…
Too much N late in the game can delay flowering, and stretch out the flowering period with no real benefit to yield… It also wreaks havoc on the finished product, especially if not flushed thoroughly… Buds grown in too much N tend to have a greyish cast to the trichromes, lower potency, and burn to a black ash rather than white, while literally smelling of ammonia… Its a pipe smoker’s nightmare because it burns your lips, fills your pipe with that gross liquid ammonia resin, and leaves a wet/oily black ash that solidifies in the bowl… It kills any possible enjoyment of any hits after the initial one… Its kind of like smoking shake, I’m sure everyone has seen it… Especially if weed in their local scene is grown in corn fields…
You can use cheap ferts with good results if you know what you’re doing, but you should definately get the proper formulation for each stage… Even with that, and a really good eye for spotting problems FAST, its vital to flush often throughout its life to clean out toxic salt buildups, and to ultra flush before harvest… and A lot of people will just say to throw it away, but … Just do 1/3 of whatever the instructions say…
I usually start off really low and increase only if I don’t see any burn coming on… You do have to be careful because mg can really fry your babies… Keep it light and simple and you should be fine…
Hope you find this helpful and by the way: WELCOME TO ILGM
will 
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@garrigan62
thank you very much for your quickly answer, but I know these issues but my problem is this that application rate is not written on the labels of this fertilizer. I thought someone from friends knew that I have to use how many grams in how many liters of water for each plant?
I will be really grateful if anyone can guide me about the dosage.
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@garrigan62
OK. Thank you so much.