Here you go Mary - lots of previous discussions about this and many recommendations - both organic and synthetic. Just keep in mind that most any liquid can be diluted down to a 3-1-2 level or approx. My personal preference is the fish and kelp blends.

Dave

/best-liquid-fertilizer/

Mary, why are you narrowing the options to a 3-2-1 ratio?

if you want cheap (unless strictly growing organic) then stay away from liquid and buy dry water soluble fertilizer and add your own water..the stuff i buy cost $16 and i can make hundreds of gallons using it at 1/4-1/2 strength.

for organics, fish emulsion is one of my favs because it helps build the
soil, won't burn and in most cases, if the soil is already decent, the
fish emulsion is all you need. lowes/hd sells gallon of it for $13.

Amen to that about water soluble (and also dilution). Miracle-Gro is dirt cheap and 24-8-16 full strength (that's 3-1-2 diluted). You can make a swimming pool full of the stuff at low cost. It is truly amazing how much liquid fertilizers charge extra for what is essentially added water. Maybe there are magic ingredients that are in the expensive stuff in addition to N, P, and K, but I've never been convinced of that.

@Dave: Thank you for the link to that! I've tried to dig around but many times, experience is better than blind searching, so I appreciate it. I am not set on 3-1-2 itself, just the ratio.

@rhizo_1: the 3-1-2 ratio is what most plants want to use, as far as I can read up on, via container gardening and it seems, lawn care.

@stevie: the only reason I was going specifically for liquid is because I use a siphon hose-end sprayer, and I thought maybe the water soluble might not be efficient. But I suppose water soluble is water soluble, eh?

@daninthedirt: thanks for your addition. I think I overlooked that MG somewhere; for some reason I was convinced I couldn't find a MG 3-1-2!

Thanks again for advice and pointers. I am not opposed to a water-soluble fertilizer, but just have been unable to find one in 3-1-2. Hopefully now I have a lead on one!

I guess I am confused. Are you looking for finished product of 3-1-2? Like was pointed out Miracle Grow is 24-8-16 which is 3-1-2 ratio you are looking for. MG plant food has directions on the package on how to use in hose end sprayer. Its water soluble and stay mixed real good. I mix it up in milk jugs to use when transplanting and it stays mixed and does not settle out so would work great in hose end sprayer. If you need 3-1-2 final mix, just dilute MG down by adding 8 times as much water as recommended. .I am not a big fan of foliage feeding. I feed the soil and let the root system of the plant do its job.