A Cessna 421 pilot reported a crop duster pilot failed to monitor or utilize CTAF procedures at an uncontrolled airport resulting in a NMAC.

Narrative

I was flying a Cessna 421 when I was involved in a near miss with a crop duster on a half mile final from my runway of intended landing.Since my destination is an uncontrolled airport; I tuned to airport UNICOM about 15 miles to the west of the airport for advisories and conditions. I did not hear anyone else on the UNICOM providing any positioning or reporting. I reported my position on the UNICOM eight miles west of the ZZZ VOR with my intention to make a full stop. My landing lights were on; as well as my strobe and beacon lights at least ten miles prior to final approach. I again reported my position on left base turning final; and another report of my position on final approach. I scanned my instruments on approaching the airport and did not see any traffic on my TCAD screen. Additionally; no other aircraft were making any calls on the UNICOM frequency at anytime during my approach and landing at the airport. Throughout the approach I was scanning the horizon and did not see any other traffic. However; on final approach on half mile final to Runway 32; a yellow crop duster aircraft was completing a right turn to final and cut me off approximately 300 FT horizontally and 50 FT below. At that moment I immediately initiated a go-around and subsequently safely landed on Runway 32. Although I understand that a radio and transponder are not necessarily required at an uncontrolled airport; that rule is archaic and dangerous today as more aircraft are flying and some uncontrolled airports; including my destination; see heavier traffic.