The present disclosure relates to a support post assembly (10) for agricultural applications, comprising a post (12 120) provided with first coupler means (18) for respective wires (4, 5). The post assembly comprises, moreover, at least one crosspiece (20) fixed on the post (12) and provided with second coupler means (23) for respective wires (4). Said at least one crosspiece (20) comprises an upper surface (21) and a pair of side walls (22) extending downwards from said upper surface (21) and said second coupler means (23) comprise cavities (23) shaped like an upside-down L and formed at end portions of said side walls (22), the cavities (23) formed on a side wall (22) facing the respective cavities (23) formed on the other side wall (22). A support structure (100) for agricultural applications comprising a plurality of the aforesaid support post assemblies (10) is also disclosed.
