Mr Hurst had always wanted to buy that land but was never able to, his friend and fellow irrigation leader Dave Finlay said at the unveiling ceremony last month.
''Today, we will ensure his memory on this piece of ground. Let's call it Hurst Park and be done with it.''
Mr Hurst's contribution to farming was acknowledged during his lifetime with an honorary doctorate of science from Lincoln University, an OBE for services to agriculture and education, the Ron Cocks Memorial Award for leadership in irrigation and life membership of Federated Farmers.
However, ''he never wanted accolades'', Mr Finlay said.
''If he could today, he would chase me out of here.''
Only a few people had the DNA of leadership Mr Hurst displayed, Mr Finlay said.
''We're so fortunate to have had Sid in the community.''
He thanked Mr Hurst's family for ''how unselfish you were with Sid''.
A second, identical plaque has been added to the one unveiled at the Awamoko Domain in 1982 by thenprime minister Robert Muldoon when the irrigation scheme construction was finished.