They included using a drone to spot a water leak, a butchery challenge, weighing and shearing sheep and artificial breeding.
Contestants' grasp of agricultural-related road rules were tested by a police officer in a module involving the New Holland police tractor.
The practical event was followed by a fast-paced agri-knowledge quiz hosted by Te Radar at the Dannevirke Town Hall.
The prestigious contest has undergone a major overhaul since marking its 50th anniversary in Invercargill last year.
"We're now showcasing all aspects of what it means to be a modern food producer," said Te Radar.
Joseph has several qualifications from Massey University, including a Graduate Diploma in Rural Studies. This was his first regional final.
The win will mean he will represent the East Coast at the grand final in Hawke's Bay on July 4-6.
"I'd like to think I will have a bit of an advantage because it will be easier to rally local support," he said.
Watts's win netted him $12,000 worth of prizes, including an XR150 Honda farm bike and a WorkSafe leadership course in Wellington.
The Tikokino Young Farmers member was named the most tech-savvy contestant, and took home awards for outstanding leadership skills and showcasing innovation.
Greytown contract milker Hamish Hammond, 29, came second.
Rob Barry, 27, who is the sustainability lead for the BEL Group of farms, placed third. He won the food award and the prize for championing environmental best practice.
All seven finalists who will clash in the FMG Young Farmer of the Year Grand Final in Hawke's Bay are now known.
They are Matt McRae, Alan Harvey, Georgie Lindsay, Alex Field, Joseph Watts, Emma Dangen and James Robertson.
The Young Farmer of the Year contest began in 1969 and showcases the country's agri-food sector.
The contest is supported by FMG, Ravensdown, Honda, WorkSafe, Zero Harm Farm, STIHL, Lincoln University, Massey University, Southfuels, Northfuels, Betacraft and New Holland.