I use a commercial fertilizer injector... actually, it's more geared towards home gardeners. It was around $60-$70 for a 3-gallon tank (3/4 gallon is around $50) and has an adjustment knob... HI is around 100:1 and LO is maybe 1000:1 (I think.) Or maybe it's 10:1 thru 100:1, I think it depends on the model and if hose connection or PVC. And a couple settings in-between. I'd assume it would do similar but I'm always concerned with soaker hoses plugging... they aren't really reliable putting fertilizer through them but maybe if they had a filter on them to at least 180 microns... so I use drip, which is inexpensive nowadays.
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