THAT stuff is NASTY strong - use ONCE in early week 6! See what it does by doing 1 plant and not another. THEN you have a clear starting point if you decide to "play" with that crap any more.......One mistake and it's yellow out city with things that high...When I used synthetics. The one P&K "slapper" I liked was ATAMI's (B'cuzz) blossom Builder 0-9-19....I would hit the plants once or sometimes twice (strain dependent) late week 5 and again at late week 6......I like higher K over higher P. This works nicely and enhances coloring too!
First time I heard that too.....that go's back decades!
Hmm, not something I would do for any reason.....N is FAR more important in veg then higher PK ratio's.....
You want to increase root growth - in any hydro OR soil? The BEST thing is a GOOD kelp extract!!!
Age old has been my go to for YEARS! Maxicrop Seaweed is nice, has an extra bit of K (nice) and less N&P then Age Old but, there is very little there any way. Kelp has been PROVEN to increase root growth by as much as 175% by a (now forgotten the name) College paper. The info is still available on the web but, you have to word it correctly for Google to look up college (.edu) papers......In soil you use kelp meal and some feeding of Kelp extract to achieve massive root growth.......
The use of Kelp will way pass any use of extra P&K levels in veg for the result your looking for. Any company saying that their doing elevated P&K in veg for rooting is more on the fringe of reality in my book.
I'll BET that if you ran 2:1:1 or better yet 3:1:2 and used Kelp you would, in the long run...have better results all the way through veg.. I would continue the 3:1:2 to week 2-3 of bloom. Up the P at that point a bit and then at 5 lower the N and up the P&K again and run it out....
Keeping P low in veg has always worked out for the best for me.....I might bump the K by 3 points or more for a "colored" strain as K helps express coloring! But I have never achieved wanted results by any increase of P in veg.....
my 2 cents on that!
But by all means - if you try kelp and it doesn't do what YOU want - do what works for YOU!
But for the most part...a 1:2:2 ratio is bad for vegging plants and suggesting that for novice growers is a ticket to problems as they have not got "your" methods and products to get the "results|" you do Honda...Any even minor deviation from what you use and what any content is - even your "city" water. Could make a drastic change in results for them! Everything is in relation to the other things....A long hard road of adjusting what they "got" to copy the results YOU get!
New and Novice/intermediate growers.....Try the Kelp first!