The Mishna says that you if take over a field for three consecutive years and claim ownership then it is assumed that you own it - "חזקה" [in old French]. The Gemara says that if the years weren't consecutive then it is not yours. However, if it is a field that is normally left fallow every other year, "אתרא דמוברי באגי", and you planted it every other year, you have a chazaka.
What is the din if the person planted a field in an אתרא דמוברי באגי consecutively??