It seems difficult to reverse the trend of speculation that is affecting the value of agricultural land. However, have you looked at any models in which the speculators could work to your advantage, rather than getting in your way? For example, you could own the land and issue shares, or set up part of it as a trust, instead of it being the opposite. In that way, you would remain owners of the land, you would let the speculators have fun speculating, and you could use the money to finance your own land.
On May 2nd, 2017. See this statement in context.