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Ms Bulk, who is an assistant viticulturist at Felton Road in Bannockburn, said she was "thrilled" and "delighted" about the win.
The competition was held at Palliser, in Martinborough, on August 27, where the contestants competed in the BioStart Hortisports race and a wide range of practical and theoretical challenges.
The winner was announced at the Bragato Dinner in Wellington on Thursday.
Event co-ordinator Nicky Grandorge said Ms Bulk was "very passionate about viticulture" and had proved "she has the skills and knowledge to become one of the New Zealand wine industry’s future leaders".
She had excelled in both the practical and theoretical sections of the competition, Ms Grandorge said.
Ms Bulk is only the second woman to win the national competition.
It is also only the second time the national title has been won by someone from Central Otago; Nick Paulin, of Peregrine Winery, won the competition in 2011.Ms Grandorge said it was "encouraging" to see more women entering the event this year.
Scott Lanceley, of Foley Family Wines, in Wairarapa, was runner-up and Jake Dromgool, from The Landing, in Kerikeri, came third.
Ms Bulk’s prize package includes a Hyundai Kona for a year, a $5000 Agmardt travel grant, $2000 cash, Bahco golden secateurs, glassware and a leadership week where the winner travels around New Zealand to meet influential people in the wine industry as well as leaders from other industries.
She will also go on to represent the wine industry in the Young Horticulturist of the Year competition in November.