Reference for Kilayim 6:6
פִּסְקֵי עָרִיס, שְׁמֹנֶה אַמּוֹת וָעוֹד. וְכָל מִדּוֹת שֶׁאָמְרוּ חֲכָמִים בַּכֶּרֶם, אֵין בָּהֶם וָעוֹד, חוּץ מִפִּסְקֵי עָרִיס. אֵלוּ הֵן פִּסְקֵי עָרִיס, עָרִיס שֶׁחָרַב מֵאֶמְצָעוֹ וְנִשְׁתַּיְּרוּ בוֹ חָמֵשׁ גְּפָנִים מִכָּאן וְחָמֵשׁ גְּפָנִים מִכָּאן. אִם יֵשׁ שָׁם שְׁמֹנֶה אַמּוֹת, לֹא יָבִיא זֶרַע לְשָׁם. שְׁמֹנֶה אַמּוֹת וָעוֹד, נוֹתְנִין לוֹ כְדֵי עֲבוֹדָתוֹ, וְזוֹרֵעַ אֶת הַמּוֹתָר:
Gaps in an <i>aris</i> [must be] eight cubits and "somewhat more" [to nullify the validity of the <i>aris</i>]. All measurements that the Sages spoke of in regards to a vineyard, the term "somewhat more" is never used [all measurements are exact] except in the case of gaps in an <i>aris</i>. These are [considered] gaps in an <i>aris</i>. If an <i>aris</i> was laid waste in its center but five vines remain on this side and five on this side, if there is [in the gap] eight cubits, he may not bring [sow] seed there.under the rest of it. [But if it is] eight cubits and "somewhat more", we give him his work space [for tillage] and he may sow the rest of it.