farmers are performing their agriculture during the day.
Farmers are tending to their fields.
Performing their agriculture is a rephrasing of tending to their fields.
exists e1 x1 x2 x3.(n_day(x3) & during(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_agriculture(x2) & of(x2,x1) & n_thing(x1) & n_farmer(x1))
exists e1 x1 x2.(to(e1,x2) & n_field(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_tend(e1) & n_farmer(x1))