This tune was used as the school song at the high school my sons attended - the chorus went something like:
Hurrah, hurrah, for the plough and the harrow and the hoe
Hurrah, hurrah, for the wheat in the waving row.....
I don't know who the perpetrator was, it was a long time before my boys went there. But is is a school that specialises in agricultural subjects, which may make the choice of words clearer! Neither of my sons became farmers either - one is studying music (jazz drumming) after some years working in the IT field, the other is a gymnastics teacher.
Cheers
JennieG