Oops, I meant K, but found what I needed. Lol
just buy soluble potassium sulphate powder, its like $2 to $10 per kg depending on how much you buy, 5g per gal you can push to 10g per Gal sometimes 20g per gal when using it solo with some strains but 5g in a gal normally gives 400 to 600ppm
If I`m being fancy I use plant magic a+b coco then add 500 to 1000ppm of 1-2-3 powder or potassium sulphate, later in flowering I use just potassium sulphate, plus the seaweed juice too
Check the details on your seaweed feed a lot of makes say different stuff
I think the last lot I got around 30ml per gal when feeding it was the dosage but I`m sure it could be pushed to 60ml
Follia I would try 5 to 10ml per L and go from there, works well with some cheated iron and or fulvic acid but that seaweed should be quite easy for the leaves to aborsebe if you just mix it with wetting agent and what ever else you normally spray them with
You might be able to mix up stronger but I would start with 5ml per L max and go from there 10ml per L is probably going to be about right but I would try that strength on just one plant and see, I mean 20/30ml per L may even be ok, seaweed extracts differ from company to company depends on what seaweed they use and how they extract it
I`ve seen some saying 25/30ML per L, but 150ML(I`m in the UK so I try and buy local`ish stuff when I can) it said around 30ml per Gal, so I added vit B and triacontanol to it so its like turbo boosted
but that`s cos I`d rather use 30ML than have to double or 4x up on what they say to feed when they don`t bush up as much as I want, lol
but if you`ve never used seaweed before 30ml per Gal of that stuff should make a real diffrence I mean I would check how much they say to use and then ph the water after you add it some seaweed extracts can really put the ph up a bit that`s why some of them are better to feed a little bit each feeding from near the end of flower than bombing them with loads of it
cos they`ll react hard but then 3 weeks or so later you may end up with a lock out
So feed 30ML per L or half of what the people that make it say to feed
then step it up on one plant next run
normally you can give 2x to 4x what they say to give, but best to start at 1/2 power as you get the odd product that`s really strong, I call such products good value, lol