The Coggans are well-known fifth-generation farmers who hope to sow more than 600 hectares of wheat in 24 hours after their farm received adequate planting rain in May and early June.

Before the Guinness World Record attempt starts at 10am Mr Pfeffer will check the calibration of the multi-planter and air seeder to ensure they comply with the Guinness specifications for the seeding rate of 120 seeds per square metre.

He will be the official time-keeper and validate the sowing method and results, in keeping with Guinness specifications for a third party such as an agency of a recognised agricultural association to undertake this role.

"Guinness World Records has specific guidelines that outline how to achieve the record for the largest surface sown with wheat in 24 hours by a team of four, using one planting rig and based on the total surface area," Mr Pfeffer said.

Phillip Coggan said the family believed the current world record is 571.9 hectares and is hoping to seed at least 600 hectares which it will measure with a Beeline arrow GPS navigation system.

Mr Pfeffer said he would be assisted through the 24-hour period by Jerry Lynis who is a JP and local bus driver, Dave Waters from the Department of Natural Resources and Water, Peter Carburry from CSIRO and John Sheppard from the Department of Primary Industries and Fisheries. Gary Turner from Goondi Communications will independently verify the sown field with a GPS.

The Coggans are undertaking the world record attempt to raise money for the Prince Charles Hospital Foundation to fund further medical research after Phillip's father, John, received a heart transplant two years ago.

Donations to the Guinness World Record fundraising attempt can be made at any Rabobank branch or cheques made out to the Prince Charles Hospital Foundation can be mailed to Rhode Road, Chermside, 4032.

AgForce Grains is donating $1000 to the cause.