Reference for Bava Batra 2:8

מַרְחִיקִין גֹּרֶן קָבוּעַ מִן הָעִיר חֲמִשִּׁים אַמָּה. לֹא יַעֲשֶׂה אָדָם גֹּרֶן קָבוּעַ בְּתוֹךְ שֶׁלּוֹ, אֶלָּא אִם כֵּן יֶשׁ לוֹ חֲמִשִּׁים אַמָּה לְכָל רוּחַ, וּמַרְחִיק מִנְּטִיעוֹתָיו שֶׁל חֲבֵרוֹ וּמִנִּירוֹ, כְּדֵי שֶׁלֹּא יַזִּיק:

A fixed goren (threshing floor) is distanced fifty cubits from the city. [A fixed goren is one which has a large pile which is winnowed with a winnowing shovel. And a goren which does not have a large pile, where the chaff need not be winnowed with a winnowing shovel but is dispersed by the wind blowing through the pile, is called a non-fixed goren.] One may not set up a fixed goren in his own (field) unless he has fifty cubits on all sides. And he distances (it) from his neighbor's plants, and from his nir so that he not harm (them). [A nir is the plowing of the summer days aimed at killing the roots of thorns and weeds. ("so that he not harm":) This is the reason (for distancing) — so that the chaff not harm his plants and his nir. For it (the chaff) moulders and spoils the nir and dries up the plants.]

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