"There is also an autumn-sown trial alongside it," Gardyne said.
Seeing the oats growing in a bigger area gave a better indication of how the variety would perform in paddock conditions, he said.
He was impressed with how the oats were doing.
"The varieties are more even and they look like they have got some real potential for good yields."
Oats are a good crop to grow in Southland and cope well with the region's damp weather.
The husk, which protects the grain, dries fast if it rains.
The event is a networking opportunity for those interested in growing oats.
"It will give [people] an update on what is happening in the marketplace."
The oat-breeding programme has been going for about 19 years.
"Hopefully [we] will find a variety to put out to farmers in the next two or three years."
The free field day includes morning tea and lunch. Vaccine Passports are required.