Mishnayos Sheviis Perek 2 Mishnah 6

מבריכין (bending a vine by drawing it into the ground and make it grow forth as an independent plant) – bend the vine-shoot of the vine in the ground and covering it with dust.

מרכיבים – bringing a branch of a tree and engrafting it upon another tree that is of its species.

פחות ל' יום – In the Gemara of Tractate Rosh Hashanah [10b] , it proves that these thirty days of [a graft] taking root, according to the first Tanna/teacher and three days, according to Rabbi Yehuda, and two weeks according to Rabbi Yossi and Rabbi Shimon, that we need prior to thirty days of the addition/supplement of the Seventh Year, that we require that the sapling should take root prior to the supplement/addition to the Seventh Year, and all of them hold that the supplement/addition to the Seventh Year is thirty days, therefore, according to the first Tanna/teacher who stated that there is no taking root less than thirty days, it needs thirty days of taking root and thirty [days] of supplement/addition; according to Rabbi Yehuda who stated that taking root is three days, one needs three days of taking root and another thirty of supplement; to the words of Rabbi Yossi and Rabbi Shimon who stated two weeks, one requires two weeks for taking root and thirty for supplement. And the explanation of taking root is that the sapling takes root and its roots take hold in the ground. And the Halakha is according to Rabbi Yossi and Rabbi Shimon.