Huge Lot

I grow comfrey in a large pot, but requires a large amount of N, it can grow with other plants (legumes) using?

Believe me, I prefer to grow in the soil to help the taproot. Currently I have two soybean plants in the same container, but I'm sure if you can fix nitrogen from the atmosphere enough to make a significant difference. I heard urine is an acceptable source, but it throws the balance of sodium in the soil. All suggestions will help.

Pulses do not produce their own nitrogen, so your reasoning is correct. You may be given comfrey everything you need with your current subscription. Remember that the first number is the nigtrogen fertilizer. Therefore, more First higher average nitrogen. A 6-6-6 is a balanced text. Therefore, if you use a 10-6-6 provides more nitrogen. But I well your idea of using soybeans to complement. Here in Fl Comfrey not increased because is very invasive and take over.