You now know the secret to successfully growing big spuds ..
Dung from goats or rabbits .
If you turn it into liquid manure , adding some sugar to bring onnthe yeasts as well and soak a block of bales of straw with it.
Once the rot starts in the straw , plant your couple of spuds in it & keep up the liquid manuring regime but at a slightly weaker rate, adding more treated damp straw as the crop tips emerge , so there is just a few inches of tops on show at any time .
You'll like as not end up with around 1,000 kg of spuds per growing station just like the champion record breaking growers do .