DO SEED ROOTS GROW SIDEWAYS? (Yerushalmi Kilayim Perek 7 Halachah 1 Daf 31b)



(Mishnah): One who is Mavrich a vine (reinserts the attached branch of a vine into the ground to then protrude elsewhere with renewed growth) - if there aren't three Tefachim of earth on top of it, he shouldn't introduce there another seed, even inside a (hollowed out) gourd or in a pipe.



If he was Mavrich it into a rock, even if there are only three fingerbreadths on top of it, it is permitted to bring another seed.



A bent vine in a vineyard is measured from the second root (since it appears to be planted from there).



(Gemara): The Mishnah taught, "...he shouldn't introduce there another seed" - but from the side is permitted.

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What's the case? If the problem is that the seed roots enter into the place of the vine roots, why talk specifically about a vine? If it's because he's planting within the work access area of a vine, let it teach 6 Tefachim?

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Rather, it follows R. Akiva, who said that only 3 Tefachim must be distanced from a single vine.



Rebuttal: If so, it should be prohibited even from the side and it should just teach three Tefachim (without mentioning 'on top of it')?

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Answer (R. Yirmiyah citing R. Chiya bar Abba): (It's not because of work access; rather) it's prohibited because roots of seeds may not be planted on top of a vine.



(Mishnah in Maseches Bava Basra): One must distance seeds, a plow and urine three Tefachim from a (neighbor's) wall (as they damage it).



Question: Our Mishnah implies that seed roots do not spread out sideways and the Mishnah there says that they do?

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Answer (R. Yosi): The concern of that Mishnah is that the roots cause the soil to become crumbly thereby weakening the wall. This is certainly true as urine itself doesn't move sideways.

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Question (R. Yosi bei R. Bun): (Perhaps one could think that urine could spray sideways) but the Mishnah also taught about a plow - could one suggest that a plow itself moves sideways? So the concern of the Mishnah must be the crumbling of the soil.