yellowing bean leaves

[Squash64]

[attachment=1]

Sorry if this has already been asked a million times, but what is the cause of the lower leaves on beans going yellow?  This is a Lab-Lab and it looked fine until about a week ago.  The top is alright.
All my other varieties of beans are not affected.....touch wood.

[Squash64]

[saddad]

I wouldn't worry... fast growing climbers like those often shed the lowest/oldest leaves....  :)

[grannyjanny]

An old boy on our site came across yesterday & said my beans weren't green enough & they needed growmore, no comment, just a smile ;).

[Fork]

Some epsom salts in your water will help with the yellowing

[grannyjanny]

What dose please Fork?

[Fork]

I use 2 tablespoons per gallon of water

[grannyjanny]

Thank you.