(R. Yochanan): R. Yosi, R. Yishmael and R. Yochanan ben Nuri all have the same view (that although one may plant near a single vine, if the seeds surround the vine, it is prohibited)...

R. Yishmael - as he taught that if there's a small garden that is surrounded by a fence with an Aris (of vines) on top, if the garden area is enough to hold a harvester and his basket on each side, he may plant in the middle of the garden.

(What is that measurement?) R. Yona said - An Amah for the harvester and an Amah for his basket; and the same on the other side (which therefore means that the area between the vines on either side of the garden is 4 by 4 Amos).

They wished to explain that Beis Shammai who said in our Mishnah that one measures 4 Amos for an Aris from the base of the vine, it is understandable; but according to Beis Hillel that it's measured from the fence to the field, don't the vine trunks reduce the 4 Amos?

Rebuttal: The case is when the vines are clinging to the wall.

Question: Why do you say that if there aren't 4 Amos between them, that one may not plant? Less than 5 vines in an Aris are anyway insignificant?!

Answer (R. Chananya): The case is when he had two vines planted in a corner, as if you run a string between them, it appears like a vacant area of 4 Amos.

R. Yosi is the second Tanna mentioned by R. Yochanan who follows this view, as an earlier Mishnah teaches (Perek 5 Mishnah 3 - Menachos 66(e)) - R. Yosi says if there aren't 4 Amos (in a pit), he should not introduce another seed there (since the walls of the pit are surrounding the seeds).

Question: According to Beis Shammai who said that they measure from the base of the vines, it's understandable; but according to Beis Hillel who said that one measures from the fence to the field, don't those vine trunks reduce the 4 Amos?

Answer: R. Yosi was referring to when the vines were clinging to the wall.

And so too R. Yochanan ben Nuri (of our Mishnah) holds this way (like R. Yosi and R. Yishmael).

It's logical to say that R. Yosi and R. Yishmael agree with R. Yochanan ben Nuri, but he does not agree with them; and that R. Yosi agrees with R. Yishmael, but R. Yishmael does not agree with him.

(Rav Yehuda citing Rav): (The Mishnah taught (Menachos 70 (c) 1.) that R. Akiva says that work access is three Tefachim.) The Halacha follows R. Akiva.

(R. Yaakov bar Idi citing R. Yehoshua ben Levi): The Halacha follows the lenient opinion in Chutz LaAretz.

(R. Yaakov bar Acha): It was also taught in Bavel that the Halacha follows the lenient opinion in Chutz LaAretz.