Pe'ah, Chapter 6, Mishnah 10. This mishnah deals with various cases in which the laws of shichechah (forgotten produce) do not apply.
Grain and bundles not designated for eating:
"Tevuah shenatnah leshachas" - grain that was set aside and designated to serve as fodder, that is, animal feed.
"O la'alumah" - stalks of grain that are not used for food purposes, but rather for tying up the sheaves of grain themselves, serving only as binding.
"Vechen b'igudei hashum" - bunches of garlic used for tying other bunches of garlic.
What all of these have in common: they are not intended for human consumption, but rather for animal feed or for tying and gathering.
The bunches of garlic and onions:
Another category is "V'agudos hashum vehabetzalim" - garlic and onions that are not yet at the final stage of gathering. First they are tied into small bunches, and these are what the mishnah refers to, and only afterward are they combined into much larger bundles. As we learned earlier in the tractate, the law of shichechah applies only at the stage of gemar melachah (completion of the work), at the time of the final gathering of all the bundles together. Since we are dealing here with a stage that precedes that, in all of these cases there is no shichechah.
Those hidden in the ground:
The mishnah now takes up the question: what is the law regarding the types of vegetables that grow beneath the ground, the root vegetables, if one forgot them in the soil? On this the mishnah says: "V'chol hatemunim ba'aretz, kegon hacheluf vehashum vehabetzalim" - the cheluf is a type of onion, and likewise garlic and onions themselves. The Tanna'im disagree about their law:
Rabbi Yehudah says: "Ein lahem shichechah" - shichechah does not apply to them, for the verse states "Veshachachta omer basadeh", and he explains "basadeh" - specifically upon the surface of the field.
And the Sages say: "Yesh lahem shichechah" - shichechah does apply even to those items whose edible portion grows beneath the ground, for they explain the word "basadeh" according to its plain meaning, within the field; and even what is beneath the ground is subject to the laws of shichechah.
In summary: In this mishnah we learned that there is no shichechah for grain designated as fodder or for binding, nor for bunches of garlic used as ties, since they are not meant for human consumption, and likewise for the small bunches of garlic and onions, since that is not the stage of gemar melachah. We also examined the dispute between Rabbi Yehudah and the Sages regarding produce hidden in the ground, which hinges on the interpretation of the word "basadeh" in the verse.