Bikkurim, Chapter 1, Mishnah 11. This mishnah opens with a dispute we have already encountered, and the commentators struggle to understand why the mishnah returns and repeats it.
"HaKoneh sheloshah ilanos b'soch shel chaveiro - mevi bikkurim":
One who buys three trees in his fellow's field, even though he bought only the trees, brings Bikkurim and recites. Even the first Tanna agrees that when one buys three trees, the land around them is acquired along with them, since it comes together with them, and therefore it is considered "your land" - not only the trees are his, but the land as well, and so he brings and recites.
The view of Rabbi Meir:
Rabbi Meir says: "Afilu l'shnayim" - the same law applies even with two trees. In Mishnah 6 we learned that with two trees the Sages were in doubt whether land is acquired along with them or not, and therefore they ruled that he brings but does not recite. Rabbi Meir, in contrast, holds with certainty that even when one buys two trees the land is acquired.
"Kanah ilan v'karkao":
One who buys only a single tree, but specified at the time of purchase that he is also buying the land around the tree - even though this is a single tree, since he explicitly bought the land it is his, and therefore he brings and recites.
The view of Rabbi Yehudah:
Rabbi Yehudah broadens the definitions of ownership and says: "Af baalei arisus v'chachirus mevi'in bikkurim". In Mishnah 2 we learned that sharecroppers do not bring Bikkurim, and this includes two types:
Aris (sharecropper): one who gives the landowner a percentage of the crop.
Chocher (tenant farmer): he does not give a percentage, but a fixed sum to the landowner.
Rabbi Yehudah disagrees and holds that the status of a sharecropper is a sufficient level of ownership to bring Bikkurim and to make the recitation, and the land is considered "your land".
The Yerushalmi, however, explains that we are not dealing here with an ordinary tenant farmer, but with a situation in which the arrangement passes from generation to generation, from father to son. Precisely in this case Rabbi Yehudah disagrees and rules that they bring and recite, for because of the intergenerational connection between them and the land - even though they are no more than sharecroppers - they do bring and recite over the Bikkurim. But with an ordinary sharecropper he would agree that he cannot.
In summary: in this mishnah we learned the levels of ownership required in order to bring Bikkurim and to recite: one who buys three trees acquires land along with them, and therefore brings and recites; according to Rabbi Meir, even with two trees; one who explicitly buys a tree and its land - even with a single tree; and according to Rabbi Yehudah, even sharecroppers and tenant farmers bring Bikkurim, and according to the Yerushalmi specifically when the arrangement continues from generation to generation.