[blackberryjam]

Can you sow them in the same place every year

[Jamrock]

I wouldn't sow anything in the same spot every year

[Kirpi]

Yes - as there are no soil borne diseases or pests associated with this plant. I do include it in the rotation though to help spread nitrogen around the cycle; which this plant fixes in its root nodules.

[mumofstig]

I do include it in the rotation though to help spread nitrogen around the cycle; which this plant fixes in its root nodules.

Modern research indicates that very little Nitrogen is left for future crops unless all of the plant is dug in. Nitrogen fixation in legumes
The bit about Nitrogen Return to Soil is bottom right page 2 
The document can be slow to load but I find refreshing the page makes it load

[JayG]

I have a "permanent" Munty frame made from angle iron, so yes I do grow them in the same place, although the soil is partially changed every year by digging out a trench, adding used compost and partly-rotted material, then filling back in using soil from an adjacent area.

As Kirpi has already pointed out runner beans are thankfully not subject to persistent soil-borne diseases - as for the nitrogen issue runner bean roots are pretty tough and tuberous and do not rot down in the soil between the end of one growing season and the start of the next, so they go on the compost heap anyway along with the bines.

[sunshineband]

I move mine as part of the crop rotation, as the soil in different beds then gets its dose of kitchen compost and manure that I give them 

And I just get some help to lug the frame to the next bed eaxh Spring , as it is a two person job

[lettice]

I have grown mine in the same position for many years.
But, as others, I do dig a lot of compost, seaweed, and a winter trench of kitchen scraps into where they grow.

[Kirpi]

I do include it in the rotation though to help spread nitrogen around the cycle; which this plant fixes in its root nodules.

Modern research indicates that very little Nitrogen is left for future crops unless all of the plant is dug in. Nitrogen fixation in legumes
The bit about Nitrogen Return to Soil is bottom right page 2 
The document can be slow to load but I find refreshing the page makes it load

Thanks for posting the reference - I incorporate the whole plant biomass into the bed, roots, vines and leaves so that is a significant nitrogen addition to the bed for the next crop.

[mumofstig]

I incorporate the whole plant biomass into the bed, roots, vines and leaves so that is a significant nitrogen addition to the bed for the next crop.

Just to clarify ..........the document says

When the grain from the legume crop is harvested, little nitrogen is returned for the following crop. Most of the nitrogen is removed from the field

In other words even digging in everything  that's left after you have harvested your beans or peas, then legumes don't leave any more nitrogen behind than any other crop would 

[Kirpi]

Ok - so you're right. Thanks.

[mumofstig]

 I just didn't want newbies to think that growing beans and leaving roots would make a big difference to the soil - when it doesn't.

It's a shame it turned out to be another old wives' tale  






had to edit my silly spelling mistake 

[Kirpi]

True - gardening has taught me over the years to always be ready to ditch ideas when they are proven to be false.