The event was organised by a senior leadership group of the school's TeenAg club, which is the largest in New Zealand.
It's designed to encourage students to develop their theoretical and practical agricultural skills.
"Agri-sports is a great way to get students excited about the career opportunities in the agri-food sector, both on and off the farm," Nixon said.
The students, from Spotswood College, Feilding High School, Palmerston North Boys' High School and Rathkeale College, competed in teams of four.
The competition gave those keen to compete in next year's FMG Junior Young Farmer of the Year regional finals a chance to hone their skills.
"It's been a huge help. It's made me realise I need to improve my knowledge of wool and fibre and work on my fencing skills," Feilding High School student Scott Harrigan said.
"I've learned a fair bit about grains, seeds and cropping as a result of the competition."
Scott was part of the team which won the senior division for the second year in a row. His teammates were Lachie Crafar, Josh Devane and Oliver Boerjan.
"We're pretty happy and excited to have won the event again. We're all good mates and we work well together," Scott said.
Eddie Harris, Hamish Shaw, Alex Wyeth and Jock Burke from Rathkeale College took out the junior division of the competition.