A district may employ an expert in agriculture and related matters and other employees as may be deemed necessary to do any of the following:
(a) Supervise the construction of works for the irrigation or protection of land.
(b) Advise the owners of land or any persons engaged in farming the land of methods of increasing the productiveness of the land or as to any matters of husbandry.
(c) Conduct experiments as prescribed by the board.
(d) Perform duties for the general welfare of the people of the district as prescribed by the board.