Is it possible to use Plain Cement Concrete post for fencing?

I am in need of around 700-800 posts to fence my farm in a semi-arid area in TN state, India. In my place granite posts mined from quarries are normally used. It costs around Rs 300-400 per post(6-7ft). I want to use plain cement post instead of the costly granite post. As it has no rebar, it costs around Rs 170-200, and as it has no iron, it can have long life without corrosion. The posts are used to tie 6-7 nos of GI barbed wire to safeguard the property.

I want to know , whether its feasible to use PCC post for fencing. If its not, how to incorporate iron rebars without the risk of corrosion in the long run. Please suggest.