פירוש על עבודה זרה 108:11

The other opinion uses the word “it” to exclude orlah and mixed seeds because he holds that even if there are “two texts that come as one” additional halakhot could be derived. Therefore, we might have learned that orlah and mixed seeds do make any item exchanged for them prohibited. Therefore the word “it” in the phrase, “that you should become accursed like it” is necessary to exclude them.