The National Farmers Union wants to find out if grain producers are being treated properly when they deliver their crops to inland terminals.

The grassroots farm organization says in a statement that it's hearing repeated stories about producers being offered good grades for grain quality if they deliver to a terminal, which are then switched to lower grades when they arrive.

NFU president Jan Slomp says they've launched an online survey to determine the extent of the problem, in light of a reduced regulatory role by the Canadian Grain Commission.

The organization says the survey is open to all Canadian grain farmers and submissions will be kept confidential.