The boards of county commissioners are authorized to establish county agricultural demonstration farms and county agricultural demonstration plots, as provided in this chapter, for:
1. The purpose of demonstrating:
(a) New or improved varieties of agricultural and horticultural crops.
(b) The handling and management of soils.
(c) The adaptability of certain soils to certain crops.
(d) Improved cultural methods in the growing and harvesting of crops.
(e) Improved methods in farm management and in farm accountancy.
2. Any other purpose incident to agricultural development or the reclamation of lands.