Ag Show chief executive officer, Peter Erwin, said these factors were "the best for the past 15 years", buoying expectations ahead of the gates at the Royal Toowoomba Showgrounds swinging open on Tuesday, September 6, with the arrival of a Korean delegation adding to the status of the event.

Wild dog eradication and invasive animal problems will be addressed by guest speaker, Professor Steven Lapidge, from the Invasive Animals Co-operative Research Centre, in the Main Pavilion.

The Ag Show's mechanisation aspect will be showcased in its Farming the Future initiative.

Peter Erwin says more than 2000 companies will display boom sprays, chainsaws, compressors, tools, cattle-handling equipment, IT programs, trucks, utes, cars, tanks and more.

Mr Erwin said the vital role of science in agriculture, resource management, agribusiness and education continues to expand and will be well represented at this year's event.

Special activities at this year's Ag Show will include stud bull and pig sales, the Led Steer and Hoof and Hook competitions, Farm Inventor of the Year, the Toowoomba and District Old Machinery display, and cattle dog trials.

"Add to this gourmet cooking demonstrations, the international fashion parades, the Wine and Food and Town and Country pavilions, the Spinners and Weavers demonstrations and even model trains - you'll see Ag Show is an event for the whole family," Mr Erwin said.

This year's Heritage Ag Show will close on Thursday, September 8.