Feeding Potatoes?

This year I have tried growing Potatoes in bags...they have now reached the top of the bag(been covering in compost in stages).
What should I be feeding them with?
Thanks for any help..

 

Personally, I would have mixed something like growmore or fish blood and bone to the soil you have been adding.

 

I mixed fish blood and bone in before planting then an occasional feed with Miracle Grow as a good general fertiliser every couple of weeks but now once a week I'm using my own Comfrey brew which is as good or better than Tomorite once a week.

Pentland Javelin (3 seeds) sown on 2nd March in greenhouse and now up to my shoulder.

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Oops, better start feeding the potatoes then...

 

Thanks for all the info......Ill put some Blood fish and bone on the top of the compost and water it well...Ill also start feeding with Tomorite..

What would the foliar feed be?

 

I have a comfrey plant and a bottle of the brew but I was reading it is good for plants with plenty of green like cabbage and lettuces. So not really ideal for root crops where you don't want all the energy going into the tops ?
This is just what I read so I would be interested to hear before I start deploying mine

 

When sowing the seeds is it okay if, say, mixed in BFB touches the seed?

 

Thanks JWK, I keep thinking that a plant or it's roots that get BFB on them will act like I've poured battery acid on them ha. I don't where this thought came from though. Am I being overly cautious?

 

Are you a short fella then Dave?

 

Doesn't sound right to me. Comfrey is relatively high in Potash, so best suited to fruiting crops like Tomatoes. Not sure it will do much good on roots (like Carrots / Parsnips), but I reckon it would be useless on leafy greens - compared to something that would provide plenty of Nitrogen, which is what they need to make them grow - Chicken manure pellets for example. For Spuds Comfrey will provide Potash, same as Tomato food would.

Sown outside? I think it would be better if the fertiliser was incorporated into the soil a week or so before sowing - e.g. using a hoe. Not essential though, and better it is incorporated (even if immediately prior to sowing) rather than being applied later, around each plant, as it is then too difficult to incorporate it I find.