Reference for Shabbat 180:2
<big><strong>גמ׳</strong></big> ורמינהי זבל וחול הדק כדי לזבל קלח של כרוב דברי ר"ע וחכמים אומרים כדי לזבל כרישא אמר רב פפא הא דזריע הא דלא זריע לפי שאין אדם טורח להוציא נימא אחת לזריעה:
R. JUDAH SAID: ALSO HE WHO CARRIES OUT A LIVE UNCLEAN LOCUST, WHATEVER ITS SIZE, [IS CULPABLE], BECAUSE IT IS PUT AWAY FOR A CHILD TO PLAY WITH. <b><i>GEMARA</i></b>. But this contradicts it: Manure, or thin sand, [the standard is] as much as is required for fertillizing a cabbage stalk: this is R. Akiba's view. But the Sages maintain: For fertilizing one leek-plant?<span class="x" onmousemove="('comment',' Which shows that the seed for a single plant entails culpability. ');"><sup>4</sup></span> — Said R. Papa: In the one case it is sown, and in the other it is not, because one does not trouble to carry out a single seed for sowing.