PEREK HAMAVRICH
1)

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

.

(a)

(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.

.

(b)

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.

:

(c)

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

.

(d)

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

. .

(e)

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?

' .

(f)

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

.

(g)

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

[ ( )] .

(h)

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.

.

(i)

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

.

(j)

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

. . .

(k)

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.

[ ] .

(l)

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.