Bob O
That is from Van Ronk who attributed the song to Leadbelly

Sometimes I plow the old grey mare
Sometimes I plow old mulie o
Soon as I get this cotton crop out
I'm going home to Julie o

Whoa back Buck and gee by the lamb
Who broke the back band Cunningham
When I was skinnen for Jimmy Ryan
Carven my initials on a mules behind

I didn't plant no beans or peas
Had bad luck with the taters o
Cotton crop it didnt come out
But great God Almighty tomatos o

My gal dont wear high button shoes
Feets too big for gaters o
All shes good for is a pinch of snuff
And hillin yam potatos

18 19 20 years ago
Took my gal to the party o
All dressed up in calico
But I wouldnt let her dance but a set or so

Takes two mules to pull a load
Takes four mules to pull double o
Righty o Righty o
When you get your wagon loaded wont you let her go

I may have the last verse a bit off - but thats the idea
Mark