Let the soil completely dry out. It looks pretty damp. That could be why your leaves are yellowing and dropping.
I had a very similar plant. Once dried out, I hit it with a 3/4 doseof MG and it is now lush dark green and flowers all over.

Stoney

Stoney thanks !!

What is MG ?

Could gimme a more specific instructions with the 3/4 dose of MG

thanks again !!!

MG is miracle grow - the fertilizer. I use the tomato formula myself. It's dilution is 1tbs per gallon, so at 3/4 it would be 3/4tbs per gallon added to your plant. Hope this clarifies for you.

Jay

thanks jay

About how often should I do this ?

thanks

For that size plant I'd personally hit it with the full strength ratio... About once every week and a half.

Jay

Follow the directions on the package.
If the recommended dose is every week, do so.
If you cut the dose in half, apply it twice as often.

Josh

Sorry naeluh. Yes, Miracle Grow. Actually, I use it's equivelant called Vigoro. You can buy it at any Home Depot.
I think it's 24-8-16. It's a small yellow box and the stuff is like a granular turquoise blue. You can go full strength on that guy.
I would do it every other watering..that's what I did. My plant resembled yours almost identically!
It is now lush with dark green healthy leaves everywhere and many pods now forming.
Let us know how it works for you.

BTW, once you see flowers developing, lay off the MG. High nitrogen will inhibit fruit and flowering. What I did do though is got some bone meal and sprinkled it around the base of the plant and it is really loving it :-)

Stoney