Sources
A
It was stated: Rebbi says, the House of Shammai said this only for the Sabbatical year, but in all other years of the Sabbatical cycle, the House of Shammai say that it is subject to a fifth and subject to removal. According to that Tanna, they learned the rules of the fourth-year orchard only from Second Tithe; since you say that there is no Second Tithe in the Sabbatical year, so there is no fourth-year orchard in the Sabbatical year. But then should there be no holiness in it? Its holiness comes from the verse (Lev…